Image display apparatus and driving method thereof
First Claim
Patent Images
1. An image display apparatus comprising:
- a display unit for displaying an image, anda drive unit for driving the display unit, the drive unit being connected by a plurality of signal lines, wherein;
said display unit comprises a plurality of display pixels arranged in a matrix form and the signal lines are arranged in each column, andsaid drive unit comprises a ladder resistor, impedance converters each having an input connected to an output of the ladder resistor, gray level voltage wires each connected to the output of the impedance converters, gray level voltage selecting means selectively connecting said gray level voltage wires to said plurality of signal lines, wherein said impedance converters have an offset voltage canceling unit for detecting and eliminating any offset voltage between input and output, and wherein the number of said impedance converters matches the number of said gray level voltage wires and matches a number of a plurality of gray level voltage selectors of said gray level voltage selecting means connected to the gray level voltage wires.
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Abstract
A display drive circuit has impedance converters between gray level voltage wires and a ladder resistor. At the time of writing analog image signal voltages onto signal lines, the writing can be done in three separate phases.
21 Citations
21 Claims
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1. An image display apparatus comprising:
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a display unit for displaying an image, and a drive unit for driving the display unit, the drive unit being connected by a plurality of signal lines, wherein; said display unit comprises a plurality of display pixels arranged in a matrix form and the signal lines are arranged in each column, and said drive unit comprises a ladder resistor, impedance converters each having an input connected to an output of the ladder resistor, gray level voltage wires each connected to the output of the impedance converters, gray level voltage selecting means selectively connecting said gray level voltage wires to said plurality of signal lines, wherein said impedance converters have an offset voltage canceling unit for detecting and eliminating any offset voltage between input and output, and wherein the number of said impedance converters matches the number of said gray level voltage wires and matches a number of a plurality of gray level voltage selectors of said gray level voltage selecting means connected to the gray level voltage wires. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. An image display apparatus driving method, comprising:
a step for displaying an image by writing analog image signal voltages via signal lines into pixel capacitances of individual pixels in a display unit, wherein the analog image signal voltages are written into an image display apparatus having a drive unit including a ladder resistor, impedance converters each having an input connected to an output of a ladder resistor, said impedance converters detecting and eliminating any offset voltage, gray level voltage wires each connected to the output of the impedance converters, wherein the number of said impedance converters matches the number of said gray level voltage wires, and matches a number of a plurality of gray level voltage selectors connected to the gray level voltage wires in three separate phases when the analog image signal voltages are written onto the signal lines. - View Dependent Claims (17, 18)
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19. A driving method comprising:
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a step for displaying in an image display apparatus having a plurality of display pixels arranged in a matrix form to display an image, a group of signal lines provided for each column to transmit analog image signals and connected to the display pixels, and a drive circuit for driving the display pixels and the group of signal lines at prescribed timings, and writing the analog image signal voltages into the pixel capacitances of the display pixels to display an image, wherein; said drive circuit having a ladder resistor and a plurality of gray level voltage wires each connected through a plurality of impedance converters, respectively to an output of the ladder resistor, said impedance converters detecting and eliminating any offset voltage; said group of signal lines are connected to said gray level voltage wires via a gray level voltage selector; each gray level voltage wire is connected to the output of the impedance converters, respectively, wherein the number of said impedance converters matches the number of said gray level voltage wires; at least the display pixels, the group of signal lines, the gray level voltage selector and the gray level voltage wires are provided over the same substrate; and wherein the analog image signal voltages are written in three separate phases when the analog image signal voltages are to be written onto the signal lines.
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20. An image display terminal system, comprising:
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a plurality of display pixels arranged in a matrix form to display an image; a group of signal lines provided for each column to transmit analog image signals and connected to the display pixels; a drive circuit for driving the display pixels and the group of signal lines at prescribed timings; and means for causing the display pixels to display an image in a prescribed sequence on the basis of inputted image display data, wherein; said drive circuit has a ladder resistor and a plurality of gray level voltage wires each connected through a plurality of impedance converters, respectively to an output of the ladder resistor; said group of signal lines are connected to the gray level voltage wires via a gray level voltage selector; each of said gray level voltage wires connected to the output of the impedance converters, respectively, wherein the number of said impedance converters matches the number of said gray level voltage wires, wherein said impedance converters have an offset voltage canceling unit for detecting and eliminating any offset voltage between input and output; and at least the display pixels, the group of signal lines, the gray level voltage selector and the gray level voltage wires are provided over a single substrate. - View Dependent Claims (21)
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Specification