DISPLAY DEVICE AND DRIVING METHOD THEREOF
First Claim
Patent Images
1. A display device, comprising:
- luminescence pixels arranged in a matrix;
data lines for determining a luminescence of the luminescence pixels;
write control lines for controlling writing of a signal voltage to the luminescence pixels; and
bias control lines for controlling an application of a specified bias voltage to the luminescence pixels,wherein each of the luminescence pixels includes;
a first transistor connected at one of a source terminal and a drain terminal to a first power source terminal, the first transistor converting, into a signal current, a signal voltage supplied via a data line included in the data lines;
a second transistor connected at a gate terminal to a first write control line included in the write control lines, connected at one of a source terminal and a drain terminal to the data line, and connected at an other of the source terminal and the drain terminal to a gate terminal of the first transistor, the second transistor switching between a conduction state and a non-conduction state;
a capacitance element connected at one of a first terminal and a second terminal to the gate terminal of the first transistor, and connected at an other of the first terminal and the second terminal to a second write control line for controlling writing of a signal voltage to a luminescence pixel in an immediately preceding row;
a luminescence element connected at an anode to an other of the source terminal and the drain terminal of the first transistor, and connected at a cathode to a second power source terminal, the luminescence element producing luminescence according to a flow of the signal current resulting from the conversion by the first transistor; and
a third transistor connected at a gate terminal to a first bias control line included in the bias control lines, connected at one of a source terminal and a drain terminal to the data line, and connected at an other of the source terminal and the drain terminal to the anode of the luminescence element, the third transistor switching between a conduction state and a non-conduction state between the data line and the luminescence element, andthe display device further comprises;
a data driving circuit which supplies the signal voltage to the data line;
a bias supplying circuit which supplies the specified bias voltage to the data line; and
a control unit configured to turn OFF the first transistor by changing a voltage in the second write control line, to cause a non-conduction state between the data line and the data driving circuit and a conduction state between the data line and the bias supplying circuit, and to apply the specified bias voltage to the anode of the luminescence element by turning ON the third transistor by changing a voltage in the first bias control line,wherein the control unit is configured to cause the non-conduction state between the data line and the data driving circuit, cause the conduction state between the data line and the bias supplying circuit, and apply the specified bias voltage to the anode of the luminescence element within a period in which the signal current does not flow to the luminescence element.
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Abstract
Display devices and methods capable of reversing brightness deterioration in electroluminescence elements while maintaining display quality, with simple pixel circuits and no manufacturing yield reduction, are provided. A display device includes luminescence pixels that each include a driving transistor, a luminescence element, and a switching transistor which switches between conduction and non-conduction states between a data line and the luminescence element. A data driving circuit supplies a signal voltage to the data line and a bias supplying circuit supplies a specified bias voltage to the data line. A control unit applies the specified bias voltage to an anode or cathode of the luminescence element by causing conduction between the data line and the data driving circuit, causing non-conduction between the data line and the bias supplying circuit, and turning the switching transistor ON, all within a period in which a signal current does not flow to the luminescence element.
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Citations
40 Claims
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1. A display device, comprising:
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luminescence pixels arranged in a matrix; data lines for determining a luminescence of the luminescence pixels; write control lines for controlling writing of a signal voltage to the luminescence pixels; and bias control lines for controlling an application of a specified bias voltage to the luminescence pixels, wherein each of the luminescence pixels includes; a first transistor connected at one of a source terminal and a drain terminal to a first power source terminal, the first transistor converting, into a signal current, a signal voltage supplied via a data line included in the data lines; a second transistor connected at a gate terminal to a first write control line included in the write control lines, connected at one of a source terminal and a drain terminal to the data line, and connected at an other of the source terminal and the drain terminal to a gate terminal of the first transistor, the second transistor switching between a conduction state and a non-conduction state; a capacitance element connected at one of a first terminal and a second terminal to the gate terminal of the first transistor, and connected at an other of the first terminal and the second terminal to a second write control line for controlling writing of a signal voltage to a luminescence pixel in an immediately preceding row; a luminescence element connected at an anode to an other of the source terminal and the drain terminal of the first transistor, and connected at a cathode to a second power source terminal, the luminescence element producing luminescence according to a flow of the signal current resulting from the conversion by the first transistor; and a third transistor connected at a gate terminal to a first bias control line included in the bias control lines, connected at one of a source terminal and a drain terminal to the data line, and connected at an other of the source terminal and the drain terminal to the anode of the luminescence element, the third transistor switching between a conduction state and a non-conduction state between the data line and the luminescence element, and the display device further comprises; a data driving circuit which supplies the signal voltage to the data line; a bias supplying circuit which supplies the specified bias voltage to the data line; and a control unit configured to turn OFF the first transistor by changing a voltage in the second write control line, to cause a non-conduction state between the data line and the data driving circuit and a conduction state between the data line and the bias supplying circuit, and to apply the specified bias voltage to the anode of the luminescence element by turning ON the third transistor by changing a voltage in the first bias control line, wherein the control unit is configured to cause the non-conduction state between the data line and the data driving circuit, cause the conduction state between the data line and the bias supplying circuit, and apply the specified bias voltage to the anode of the luminescence element within a period in which the signal current does not flow to the luminescence element. - View Dependent Claims (2, 3, 4, 5)
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6. A display device, comprising:
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luminescence pixels arranged in a matrix; data lines for determining luminescence of the luminescence pixels; write control lines for controlling writing of a signal voltage to the luminescence pixels; bias control lines for controlling an application of a specified bias voltage to the luminescence pixels; and luminescence control lines for controlling the luminescence of luminescence elements, wherein each of the luminescence pixels includes; a first transistor connected at one of a source terminal and a drain terminal to a first power source terminal, the first transistor converting, into a signal current, a signal voltage supplied via a data line included in the data lines; a second transistor connected at a gate terminal to a first write control line included in the write control lines, connected at one of a source terminal and a drain terminal to the data line, and connected at an other of the source terminal and the drain terminal to a gate terminal of the first transistor, the second transistor switching between a conduction state and a non-conduction state; a capacitance element connected at one of a first terminal and a second terminal to the gate terminal of the first transistor, and connected at an other of the first terminal and the second terminal to a first luminescence control line included in the luminescence control lines; a luminescence element connected at an anode to an other of the source terminal and the drain terminal of the first transistor, and connected at a cathode to a second power source terminal, the luminescence element producing luminescence according to a flow of the signal current resulting from the conversion by the first transistor; and a third transistor connected at a gate terminal to a first bias control line included in the bias control lines, connected at one of a source terminal and a drain terminal to the data line, and connected at an other of the source terminal and the drain terminal to the anode of the luminescence element, the third transistor switching between a conduction state and a non-conduction state between the data line and the luminescence element, and the display device further comprises; a data driving circuit which supplies the signal voltage to the data line; a bias supplying circuit which supplies the specified bias voltage to the data line; and a control unit configured to turn OFF the first transistor by changing a voltage in the first luminescence control line, to cause a non-conduction state between the data line and the data driving circuit and a conduction state between the data line and the bias supplying circuit, and to apply the specified bias voltage to the anode of the luminescence element by turning ON the third transistor by changing a voltage in the first bias control line, wherein the control unit is configured to cause the non-conduction state between the data line and the data driving circuit, cause the conduction state between the data line and the bias supplying circuit, and apply the application of the specified bias voltage to the anode of the luminescence element within a period in which the signal current does not flow to the luminescence element. - View Dependent Claims (7, 8, 9, 10)
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11. A display device, comprising:
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luminescence pixels arranged in a matrix; data lines for determining luminescence of the luminescence pixels; write control lines for controlling writing of a signal voltage to the luminescence pixels; and bias control lines for controlling an application of a specified bias voltage to the luminescence pixels, wherein each of the luminescence pixels includes; a first transistor connected at one of a source terminal and a drain terminal to a first power source terminal, the first transistor converting, into a signal current, a signal voltage supplied via a data line included in the data lines; a second transistor connected at a gate terminal to a first write control line included in the write control lines, connected at one of a source terminal and a drain terminal to the data line, and connected at an other of the source terminal and the drain terminal to a gate terminal of the first transistor, the second transistor switching between a conduction state and a non-conduction state; a capacitance element connected at one of a first terminal and a second terminal to the gate terminal of the first transistor, and connected at an other of the first terminal and the second terminal to the one of the source terminal and the drain terminal of the first transistor; a luminescence element connected at an anode to an other of the source terminal and the drain terminal of the first transistor, and connected at a cathode to a second power source terminal, the luminescence element producing luminescence according to a flow of the signal current resulting from the conversion by the first transistor; and a third transistor connected at a gate terminal to a first bias control line included in the bias control lines, connected at one of a source terminal and a drain terminal to the data line, and connected at an other of the source terminal and the drain terminal to the anode of the luminescence element, the third transistor switching between a conduction state and a non-conduction state between the data line and the luminescence element, the specified bias voltage is a voltage which turns OFF the first transistor when applied to the gate terminal of the first transistor, and the display device further comprises; a data driving circuit which supplies the signal voltage to the data line; a bias supplying circuit which supplies the specified bias voltage to the data line; and a control unit configured to cause a non-conduction state between the data line and the data driving circuit and a conduction state between the data line and the bias supplying circuit, and to turn ON the second transistor and turn OFF the first transistor by changing voltage in the first write control line, to apply the specified bias voltage to the anode of the luminescence element by turning ON the third transistor by changing a voltage in the first bias control line in synchronization with a period in which the signal current does not flow to the luminescence element as a result of the non-conduction state between the data line and the data driving circuit, the conduction state between the data line and the bias supplying circuit, the turning ON the second transistor, and the turning OFF the first transistor, wherein the control unit is configured to simultaneously cause the non-conduction state between the data line and the data driving circuit, cause the conduction state between the data line and the bias supplying circuit, turn ON the second transistor, and turn OFF the first transistor. - View Dependent Claims (12, 13, 14, 15)
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16. A driving method of a display device,
wherein the display device includes: -
write control lines for controlling writing of a signal voltage to luminescence pixels arranged in a matrix; bias control lines for controlling an application of a specified bias voltage to the luminescence pixels; a data driving circuit which supplies the signal voltage to data lines; and a bias supplying circuit which supplies the specified bias voltage to the data lines, each of the luminescence pixels includes; a first transistor connected at one of a source terminal and a drain terminal to a first power source terminal, and connected at an other of the source terminal and the drain terminal to an anode of a luminescence element, the first transistor converting, into a signal current, a signal voltage supplied via a data line included in the data lines; a second transistor connected at a gate terminal to a first write control line included in the write control lines, connected at one of a source terminal and a drain terminal to the data line, and connected at an other of the source terminal and the drain terminal to a gate terminal of the first transistor, the second transistor switching between a conduction state and a non-conduction state; a capacitance element connected at one of a first terminal and a second terminal to the gate terminal of the first transistor, and connected at an other of the first terminal and the second terminal to a second write control line for controlling writing of a signal voltage to a luminescence pixel in an immediately preceding row; the luminescence element connected at a cathode to a second power source terminal, the luminescence element producing luminescence according to a flow of the signal current resulting from the conversion by the first transistor; and a third transistor connected at a gate terminal to a first bias control line included in the bias control lines, connected at one of a source terminal and a drain terminal to the data line, and connected at an other of the source terminal and the drain terminal to the anode of the luminescence element, the third transistor switching between a conduction state and a non-conduction state between the data line and the luminescence element, the driving method comprising; turning OFF the first transistor by changing a voltage in the second write control line so that the signal current does not flow to the luminescence element; causing, simultaneously, a non-conduction state between the data line and the data driving circuit and a conduction state between the data line and the bias supplying circuit, one of within and in synchronization with a period in which the first transistor is turned OFF in the turning OFF; and applying the specified bias voltage to the anode of the luminescence element by turning ON the third transistor by changing a voltage in the first bias control line, the applying being performed one of within and in synchronization with a period in which the conduction state between the data line and the bias supplying circuit is caused in the causing. - View Dependent Claims (17, 18, 19, 20)
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21. A driving method of a display device,
wherein the display device includes: -
write control lines for controlling writing of a signal voltage to luminescence pixels arranged in a matrix; bias control lines for controlling an application of a specified bias voltage to the luminescence pixels; luminescence control lines for controlling luminescence of luminescence elements; a data driving circuit which supplies the signal voltage to data lines; and a bias supplying circuit which supplies the specified bias voltage to the data lines, each of the luminescence pixels includes; a first transistor connected at one of a source terminal and a drain terminal to a first power source terminal, and connected at an other of the source terminal and the drain terminal to an anode of a luminescence element, the first transistor converting, into a signal current, a signal voltage supplied via a data line included in the data lines; a second transistor connected at a gate terminal to a first write control line included in the write control lines, connected at one of a source terminal and a drain terminal to the data line, and connected at an other of the source terminal and the drain terminal to a gate terminal of the first transistor, the second transistor switching between a conduction state and a non-conduction state; a capacitance element connected at one of a first terminal and a second terminal to the gate terminal of the first transistor, and connected at an other of the first terminal and the second terminal to a first luminescence control line included in the luminescence control lines; the luminescence element connected at a cathode to a second power source terminal, the luminescence element producing luminescence according to a flow of the signal current resulting from the conversion by the first transistor; and a third transistor connected at a gate terminal to a first bias control line included in the bias control lines, connected at one of a source terminal and a drain terminal to the data line, and connected at an other of the source terminal and the drain terminal to the anode of the luminescence element, the third transistor switching between a conduction state and a non-conduction state between the data line and the luminescence element, the driving method comprising; turning OFF the first transistor by changing voltage in the first luminescence control line so that the signal current does not flow to the luminescence element; causing, simultaneously, a non-conduction state between the data line and the data driving circuit and a conduction state between the data line and the bias supplying circuit, one of within and in synchronization with a period in which the first transistor is turned OFF in the turning OFF; and applying the specified bias voltage to the anode of the luminescence element by turning ON the third transistor by changing a voltage in the first bias control line, the applying being performed one of within and in synchronization with a period in which the conduction state between the data line and the bias supplying circuit is caused in the causing. - View Dependent Claims (22, 23, 24, 25)
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26. A driving method of a display device,
wherein the display device includes: -
write control lines for controlling writing of a signal voltage to luminescence pixels arranged in a matrix; bias control lines for controlling application of a specified bias voltage to the luminescence pixels; a data driving circuit which supplies the signal voltage to data lines; and a bias supplying circuit which supplies the specified bias voltage to the data lines, each of the luminescence pixels includes; a first transistor connected at one of a source terminal and a drain terminal to a first power source terminal, and connected at an other of the source terminal and the drain terminal to an anode of a luminescence element, the first transistor converting, into a signal current, a signal voltage supplied via a data line included in the data lines; a second transistor connected at a gate terminal to a first write control line included in the write control lines, connected at one of a source terminal and a drain terminal to the data line, and connected at an other of the source terminal and the drain terminal to a gate terminal of the first transistor, the second transistor switching between a conduction state and a non-conduction state; a capacitance element connected at one of a first terminal and a second terminal to the gate terminal of the first transistor, and connected at an other of the first terminal and the second terminal to the one of the source terminal and the drain terminal of the first transistor; the luminescence element connected at a cathode to a second power source terminal, the luminescence element producing luminescence according to a flow of the signal current resulting from the conversion by the first transistor; and a third transistor connected at a gate terminal to a first bias control line included in the bias control lines, connected at one of a source terminal and a drain terminal to the data line, and connected at an other of the source terminal and the drain terminal to the anode of the luminescence element, the third transistor switching between a conduction state and a non-conduction state between the data line and the luminescence element, the specified bias voltage is a voltage which turns OFF the first transistor when applied to the gate terminal of the first transistor, the driving method comprising; causing, simultaneously, a non-conduction state between the data line and the data driving circuit and a conduction state between the data line and the bias supplying circuit; turning the second transistor ON and the first transistor OFF simultaneously, the second transistor being turned ON by changing a voltage in the first write control line, and the first transistor being turned OFF by application, to the gate terminal of the first transistor, of the specified bias voltage from the bias supplying circuit connected with the data line in the causing; and applying, in synchronization with the turning the second transistor ON and the turning the first transistor OFF and the causing, the specified bias voltage to the anode of the luminescence element by turning ON the third transistor by changing a voltage in the first bias control line. - View Dependent Claims (27, 28, 29, 30)
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31. A display device, comprising:
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luminescence pixels arranged in a matrix; data lines for determining luminescence of the luminescence pixels; write control lines for controlling writing of a signal voltage to the luminescence pixels; bias control lines for controlling an application of a specified bias voltage to the luminescence pixels; and luminescence control lines for controlling the luminescence of luminescence elements, wherein each of the luminescence pixels includes; a first transistor connected at one of a source terminal and a drain terminal to a first power source terminal, the first transistor converting, into a signal current, a signal voltage supplied via a data line included in the data lines; a second transistor connected at a gate terminal to a first write control line included in the write control lines, connected at one of a source terminal and a drain terminal to the data line, and connected at an other of the source terminal and the drain terminal to a gate terminal of the first transistor, the second transistor switching between a conduction state and a non-conduction state; a capacitance element connected at one of a first terminal and a second terminal to the gate terminal of the first transistor, and connected at an other of the first terminal and the second terminal to a first luminescence control line included in the luminescence control lines; a luminescence element connected at a cathode to an other of the source terminal and the drain terminal of the first transistor, and connected at an anode to a second power source terminal, the luminescence element producing luminescence according to a flow of the signal current resulting from the conversion by the first transistor; and a third transistor connected at a gate terminal to a first bias control line included in the bias control lines, connected at one of a source terminal and a drain terminal to the data line, and connected at an other of the source terminal and the drain terminal to the cathode of the luminescence element, the third transistor switching between a conduction state and a non-conduction state between the data line and the luminescence element, and the display device further comprises; a data driving circuit which supplies the signal voltage to the data line; a bias supplying circuit which supplies the specified bias voltage to the data line; and a control unit configured to turn OFF the first transistor by changing a voltage in the first luminescence control line, to cause a non-conduction state between the data line and the data driving circuit and a conduction state between the data line and the bias supplying circuit, and to apply the specified bias voltage to the cathode of the luminescence element by turning ON the third transistor by changing a voltage in the first bias control line, wherein the control unit is configured to cause the non-conduction state between the data line and the data driving circuit, cause the conduction state between the data line and the bias supplying circuit, and apply the application of the specified bias voltage to the cathode of the luminescence element within a period in which the signal current does not flow to the luminescence element. - View Dependent Claims (32, 33, 34, 35)
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36. A driving method of a display device,
wherein the display device includes: -
write control lines for controlling writing of a signal voltage to luminescence pixels arranged in a matrix; bias control lines for controlling an application of a specified bias voltage to the luminescence pixels; luminescence control lines for controlling luminescence of luminescence elements; a data driving circuit which supplies the signal voltage to data lines; and a bias supplying circuit which supplies the specified bias voltage to the data lines, each of the luminescence pixels includes; a first transistor connected at one of a source terminal and a drain terminal to a first power source terminal, and connected at an other of the source terminal and the drain terminal to a cathode of a luminescence element, the first transistor converting, into a signal current, a signal voltage supplied via a data line included in the data lines; a second transistor connected at a gate terminal to a first write control line included in the write control lines, connected at one of a source terminal and a drain terminal to the data line, and connected at an other of the source terminal and the drain terminal to a gate terminal of the first transistor, the second transistor switching between a conduction state and a non-conduction state; a capacitance element connected at one of a first terminal and a second terminal to the gate terminal of the first transistor, and connected at an other of the first terminal and the second terminal to a first luminescence control line included in the luminescence control lines; the luminescence element connected at an anode to a second power source terminal, the luminescence element producing luminescence according to a flow of the signal current resulting from the conversion by the first transistor; and a third transistor connected at a gate terminal to a first bias control line included in the bias control lines, connected at one of a source terminal and a drain terminal to the data line, and connected at an other of the source terminal and the drain terminal to the cathode of the luminescence element, the third transistor switching between a conduction state and a non-conduction state between the data line and the luminescence element, the driving method comprising; turning OFF the first transistor by changing voltage in the first luminescence control line so that the signal current does not flow to the luminescence element; causing, simultaneously, a non-conduction state between the data line and the data driving circuit and a conduction state between the data line and the bias supplying circuit, one of within and in synchronization with a period in which the first transistor is turned OFF in the turning OFF; and applying the specified bias voltage to the cathode of the luminescence element by turning ON the third transistor by changing a voltage in the first bias control line, the applying being performed one of within and in synchronization with a period in which the conduction state between the data line and the bias supplying circuit is caused in the causing. - View Dependent Claims (37, 38, 39, 40)
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Specification
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Current AssigneeJDI Design and Development GK
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Original AssigneePanasonic Corporation (Panasonic Holdings Corporation)
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InventorsNAKAMURA, Mika, MASUMOTO, Kenichi
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Granted Patent
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Time in Patent OfficeDays
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Field of Search
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US Class Current345/204
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CPC Class CodesG09G 2300/0842 forming a memory circuit, e...G09G 2310/0251 Precharge or discharge of p...G09G 2310/0256 with the purpose of reversi...G09G 2310/0262 The addressing of the pixel...G09G 3/3233 with pixel circuitry contro...
