Picture image display device and method of driving the same

• US 20010055828A1
• Filed: 03/30/2001
• Published: 12/27/2001
• Est. Priority Date: 06/27/2000
• Status: Active Grant

• Current Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Original Assignee: Hitachi Displays Limited (Japan Display Incorporated)
• Inventors: Aratani, Sukekazu, Kaneko, Yoshiyuki
• Granted Patent: US 6,738,034 B2
• Time in Patent Office: Days
• US Class Current: 438/34
• CPC Class Codes: G09G 2300/0439 Pixel structures
• CPC Class Codes: G09G 2300/0814 used for selection purposes, e.g. logical AND for partial update
• CPC Class Codes: G09G 2300/0842 forming a memory circuit, e.g. a dynamic memory with one capacitor
• CPC Class Codes: G09G 2300/0866 by means of changes in the pixel supply voltage
• CPC Class Codes: G09G 2310/0254 Control of polarity reversal in general, other than for liquid crystal displays
• CPC Class Codes: G09G 2310/0256 with the purpose of reversing the voltage across a light emitting or modulating element within a pixel
• CPC Class Codes: G09G 2310/061 for resetting or blanking
• CPC Class Codes: G09G 2320/0261 in the context of movement of objects on the screen or movement of the observer relative to the screen
• CPC Class Codes: G09G 2320/043 Preventing or counteracting the effects of ageing
• CPC Class Codes: G09G 2320/10 Special adaptations of display systems for operation with variable images
• CPC Class Codes: G09G 3/3233 with pixel circuitry controlling the current through the light-emitting element
• CPC Class Codes: H10K 59/12 Active-matrix OLED [AMOLED] displays
• CPC Class Codes: Y10T 82/16672 including rotatable cutters supporting work

Abstract

Pixels 20 in a picture image display device 1 are driven in such a manner that while introducing light quenching period in which electro optical elements 24 in the pixels 20 are quenched after scanning a plurality of gate lines for displaying one picture image. In other words, the pixels 20 are driven while interposing the light quenching period in which the electro optical elements are quenched between one frame and a subsequent frame. Thereby, blurred edges at the time of motion pictures display when the pixels including the electro optical elements are driven through an active matrix drive circuit is suppressed and the picture quality of the picture image display device is improved.

Claims

1. A picture image display device comprising pixels which are formed in a matrix shape defined by a plurality of gate lines and a plurality of data lines crossing thereto and each including an electro optical element and a switching element, wherein the pixels are driven while introducing a light quenching period in which the electro optical element is caused to be quenched after the plurality of gate lines being scanned for displaying one picture image.

2. An active matrix type picture image display device comprising pixels which are formed in a matrix shape defined by a plurality of gate lines and a plurality of data lines crossing thereto and each including an electro optical element and a switching element, wherein the pixels are driven while introducing a light quenching period, in which the electro optical elements are caused to be quenched, in one frame period for displaying one picture image.

3. A picture image display device comprising pixels which are formed in a matrix shape defined by a plurality of gate lines to which scanning signals are fed and a plurality of data lines crossing thereto to which picture image signals are fed and each including an electro optical element and a thin film transistor, wherein the pixels are driven while introducing a light quenching period, in which the electro optical element is caused to be quenched, by feeding scanning signals to the plurality of gate line as well as picture image signals to the plurality of data lines after feeding scanning signals to the plurality of gate lines for displaying one picture image.

8. A picture image display device according to

claim 3

, wherein each pixel includes a first thin film transistor to which the scanning signals are fed via the gate line, a capacitor which holds the picture image signals fed from the data line via the first thin film transistor, a second thin film transistor to which the picture image signals held in the capacitor are fed and an electro optical element which is caused light emission by a drive current flowing between a pixel electrode and an opposing electrode of the electro optical element when the pixel electrode is electrically connected to a common potential line via the second thin film transistor.

13. A picture image display device according to

claim 8

, wherein the gate lines, the data lines, the first thin film transistors, the second thin film transistors, the capacitors and the electro optical elements are mounted on a common substrate.

4. A picture image display device for displaying motion picture images comprising pixels which are formed in a matrix shape defined by a plurality of gate lines to which scanning signals are fed and a plurality of data lines crossing thereto to which picture image signals are fed and each including an electro optical element and a thin film transistor, wherein the pixels are driven while introducing a light quenching period, in which the electro optical elements are caused to be quenched, by feeding scanning signals to the plurality of gate lines as well as feeding picture image signals for quenching the electro optical elements to the plurality of data lines in synchronism with the scanning signal after feeding the scanning signals to the plurality of gate lines and causing the electro optical element light emission for displaying one picture image, thereby a blurred edge of a motion picture image is prevented.

9. A picture image display device according to

claim 4

, wherein each pixel includes a first thin film transistor to which the scanning signals are fed via the gate line, a capacitor which holds the picture image signals fed from the data line via the first thin film transistor, a second thin film transistor to which the picture image signals held in the capacitor are fed and an electro optical element which is caused light emission by a drive current flowing between a pixel electrode and an opposing electrode of the electro optical element when the pixel electrode is electrically connected to a common potential line via the second thin film transistor.

14. A picture image display device according to

claim 9

, wherein the gate lines, the data lines, the first thin film transistors, the second thin film transistors, the capacitors and the electro optical elements are mounted on a common substrate.

5. A picture image display device comprising pixels which are formed in a matrix shape defined by a plurality of gate lines to which scanning signals are fed and a plurality of data lines crossing thereto to which picture image signals are fed and each including an electro optical element and a thin film transistor, wherein the pixels are driven while introducing a light quenching period, in which the electro optical elements are caused to be quenched, in one frame period for displaying one picture image, and in the light quenching period scanning signals are fed to the plurality of gate lines as well as picture image signals for quenching the electro optical elements are fed to the plurality of data lines in synchronism with the scanning signals.

10. A picture image display device according to

claim 5

, wherein each pixel includes a first thin film transistor to which the scanning signals are fed via the gate line, a capacitor which holds the picture image signals fed from the data line via the first thin film transistor, a second thin film transistor to which the picture image signals held in the capacitor are fed and an electro optical element which is caused light emission by a drive current flowing between a pixel electrode and an opposing electrode of the electro optical element when the pixel electrode is electrically connected to a common potential line via the second thin film transistor.

15. A picture image display device according to

claim 10

, wherein the gate lines, the data lines, the first thin film transistors, the second thin film transistors, the capacitors and the electro optical elements are mounted on a common substrate.

6. A picture image display device comprising pixels which are formed in a matrix shape defined by a plurality of gate lines to which scanning signals are fed and a plurality of data lines crossing thereto to which picture image signals are fed and each including an electro optical element and a thin film transistor, and further comprising a display control controller which introduces a light quenching period, in which the electro optical elements are caused to be quenched, in one frame period for displaying one picture image, and feeds scanning signals to the plurality of gate lines as well as picture image signals for quenching the electro optical elements to the plurality of data lines in synchronism with the scanning signals in the light quenching period.

11. A picture image display device according to

claim 6

, wherein each pixel includes a first thin film transistor to which the scanning signals are fed via the gate line, a capacitor which holds the picture image signals fed from the data line via the first thin film transistor, a second thin film transistor to which the picture image signals held in the capacitor are fed and an electro optical element which is caused light emission by a drive current flowing between a pixel electrode and an opposing electrode of the electro optical element when the pixel electrode is electrically connected to a common potential line via the second thin film transistor.

16. A picture image display device according to

claim 11

, wherein the gate lines, the data lines, the first thin film transistors, the second thin film transistors, the capacitors and the electro optical elements are mounted on a common substrate.

7. A picture image display device for displaying motion picture images comprising pixels which are formed in a matrix shape defined by a plurality of gate lines to which scanning signals are fed and a plurality of data lines crossing thereto to which picture image signals are fed and each including an electro optical element and a thin film transistor, wherein the pixels are driven in such a manner that while introducing a light quenching period, in which the electro optical elements are caused to be quenched, between one frame period for displaying one picture image and another frame period for displaying subsequent one picture image, and scanning signals are fed to the plurality of gate lines as well as picture image signals for quenching the electro optical elements are fed to the plurality of data lines in synchronism with the scanning signals in the light quenching period.

12. A picture image display device according to claim 7, wherein each pixel includes a first thin film transistor to which the scanning signals are fed via the gate line, a capacitor which holds the picture image signals fed from the data line via the first thin film transistor, a second thin film transistor to which the picture image signals held in the capacitor are fed and an electro optical element which is caused light emission by a drive current flowing between a pixel electrode and an opposing electrode of the electro optical element when the pixel electrode is electrically connected to a common potential line via the second thin film transistor.

17. A picture image display device according to

claim 12

, wherein the gate lines, the data lines, the first thin film transistors, the second thin film transistors, the capacitors and the electro optical elements are mounted on a common substrate.

18. A method of driving a picture image display device which comprises pixels formed in a matrix shape defined by a plurality of gate lines and a plurality of data lines crossing thereto and each including an electro optical element and a switching element, wherein the pixels are driven while introducing a light quenching period, in which the electro optical elements are caused to be quenched, after the plurality of gate lines being scanned for displaying one picture image.

19. A method of driving an active matrix type picture image display device which comprises pixels formed in a matrix shape defined by a plurality of gate lines and a plurality of data lines crossing thereto and each including an electro optical element and a switching element, wherein the pixels are driven while introducing a light quenching period, in which the electro optical elements are caused to be quenched, in one frame period for displaying one picture image.

20. A method of driving a picture image display device which comprises pixels formed in a matrix shape defined by a plurality of gate lines to which scanning signals are fed and a plurality of data lines crossing thereto to which picture image signals are fed and each including an electro optical element and a thin film transistor, wherein the pixels are driven while introducing a light quenching period, in which the electro optical element is caused to be quenched, by feeding scanning signals to the plurality of gate line as well as picture image signals to the plurality of data lines after feeding scanning signals to the plurality of gate lines for displaying one picture image.

21. A method of driving a picture image display device for displaying motion picture images which comprises pixels formed in a matrix shape defined by a plurality of gate lines to which scanning signals are fed and a plurality of data lines crossing thereto to which picture image signals are fed and each including an electro optical element and a thin film transistor, wherein the pixels are driven while introducing a light quenching period, in which the electro optical elements are caused to be quenched, by feeding scanning signals to the plurality of gate lines as well as feeding picture image signals for quenching the electro optical elements to the plurality of data lines in synchronism with the scanning signal after feeding the scanning signals to the plurality of gate lines and causing the electro optical element light emission for displaying one picture image, thereby a blurred edge of a motion picture image is prevented.

22. A method of driving a picture image display device which comprises pixels formed in a matrix shape defined by a plurality of gate lines to which scanning signals are fed and a plurality of data lines crossing thereto to which picture image signals are fed and each including an electro optical element and a thin film transistor, wherein the pixels are driven while introducing a light quenching period, in which the electro optical elements are caused to be quenched, in one frame period for displaying one picture image, and in the light quenching period scanning signals are fed to the plurality of gate lines as well as picture image signals for quenching the electro optical elements are fed to the plurality of data lines in synchronism with the scanning signals.

23. A method of driving a picture image display device for displaying motion picture images which comprises pixels formed in a matrix shape defined by a plurality of gate lines to which scanning signals are fed and a plurality of data lines crossing thereto to which picture image signals are fed and each including an electro optical element and a thin film transistor, wherein the pixels are driven in such a manner that while introducing a light quenching period, in which the electro optical elements are caused to be quenched, between one frame period for displaying one picture image and another frame period for displaying subsequent one picture image, and scanning signals are fed to the plurality of gate lines as well as picture image signals for quenching the electro optical elements are fed to the plurality of data lines in synchronism with the scanning signals in the light quenching period.

24. A method of driving a picture image display device for displaying motion picture images which comprises pixels formed in a matrix shape defined by a plurality of gate lines to which scanning signals are fed and a plurality of data lines crossing thereto to which picture image signals are fed and each including an electro optical element and a thin film transistor, wherein the pixels are driven in such a manner that while introducing a light quenching period, in which the electro optical elements are caused to be quenched, between one frame period for displaying one picture image and another frame period for displaying subsequent one picture image, scanning signals are fed to the plurality of gate lines as well as picture image signals for quenching the electro optical elements are fed to the plurality of data lines in synchronism with the scanning signals in the light quenching period, and further a backward bias is applied to the quenched electro optical elements.

25. A method of driving a motion picture image display device including a plurality of pixels arranged in a matrix shape defined by a plurality of gate lines and a plurality of data lines crossing to the plurality of gate lines, each pixel being constituted by a first thin film switch transistor coupled to one of the gate lines as well as one of the data lines, a second thin film driver transistor coupled to the first thin film switch transistor, a capacitor coupled both to the first thin film switch transistor and the second thin film driver transistor and an organic light emitting diode coupled to the second thin film driver transistor comprising the steps of:

applying data signals to the plurality of data lines in synchronism with scanning signals applied to the plurality of gate lines in a first period in one frame for displaying a motion picture image so as to cause concerned organic light emitting diodes light emission;

applying light quenching signals to the plurality of data lines in synchronism with scanning signals applied to the plurality of gate lines in a second period following the first period in the frame for displaying a motion picture image so as to quench the concerned organic light emitting diodes; and

repeating the above sequence so as to display a motion picture image.

26. A method of driving a motion picture image display device according to

claim 25

, wherein the light quenching signal corresponds to a low voltage level data signal VDL.

27. A method of driving a motion picture image display device according to

claim 25

, wherein the quenching signal includes a first pulse voltage higher than a high voltage level data signal VDH which once permits to turn on the concerned second thin film driver transistor and a second pulse voltage corresponding to a low voltage level data signal VDL, and the method further comprises the steps of applying a first voltage VAH to an anode of the concerned organic light emitting diode in synchronism with the data signal and further applying a second voltage VAL lower than the first voltage VAH in synchronism with the light quenching signal to the anode of the concerned organic light emitting diode until an application of a subsequent data signal.

28. A method of driving a motion picture image display device according to

claim 25

, wherein the quenching signal includes a first pulse voltage higher than a high voltage level data signal VDH which once permits to turn on the concerned second thin film driver transistor and a second pulse voltage lower than a low voltage level data signal VDL, and the method further comprises the steps of applying a first voltage VAH to an anode of the concerned organic light emitting diode in synchronism with the data signal and further applying a second voltage VAL lower than the first voltage VAH in synchronism with the light quenching signal to the anode of the concerned organic light emitting diode until an application of a subsequent data signal.