Picture image display device and method of driving the same

• US 6,738,034 B2
• Filed: 03/30/2001
• Issued: 05/18/2004
• Est. Priority Date: 06/27/2000
• Status: Expired due to Term

• Current Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Original Assignee: Hitachi, Ltd.
• Inventors: Aratani, Sukekazu, Kaneko, Yoshiyuki
• Primary Examiner(s): Hjerpe, Richard
• Assistant Examiner(s): DINH, DUC Q
• Application Number:
  US09/821,022
• Publication Number:
  US 20010055828A1
• Time in Patent Office: 1,145 Days
• Field of Search: 345/44-46, 345/55, 345/76-84
• US Class Current: 345/76
• 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 in a picture image display device are driven in such a manner that while introducing light, a quenching period is initiated in which electro optical elements in the pixels are quenched after scanning a plurality of gate lines for displaying one picture image. In other words, the pixels are driven while interposing the light quenching period in which the electro optical elements are quenched between one frame and a subsequent frame. Thereby, the phenomenon of blurred edges at the time of motion picture 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 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 organic light emitting diode and a switching element, wherein the pixels are driven while introducing a light quenching period formed by 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 a first period in a frame for displaying a motion picture image so as to quench the concerned organic light emitting diodes, after the plurality of gate lines are scanned for displaying one picture image.

2. 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 organic light emitting diode and a switching element, wherein the pixels are driven while introducing a light quenching period formed by 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 a first period in a frame for displaying a motion picture image so as to quench the concerned organic light emitting diodes, in one frame period for displaying one picture image.

3. A method of driving a picture image display device for displaying a motion picture image 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 organic light emitting diode and a thin film transistor, wherein the pixels are driven while introducing a light quenching period, in which the organic light emitting diode is caused to be quenched, by applying light quenching signals in synchronism with scanning signals so as to quench the concerned organic light emitting diodes, after applying scanning signals to the plurality of gate lines so as to cause the concerned organic light emitting diodes light emission.

8. A method of driving a picture image display device for displaying motion picture images according to claim 3, wherein the driving method enables prevention of a blurred edge of the motion picture image.

9. A method of driving a picture image display device for displaying motion picture images according to claim 3, wherein the light quenching period is introduced in one frame period for displaying one picture image.

10. A method of driving a picture image display device for displaying motion picture images according to claim 3, wherein the light quenching period is introduced between two frame periods for displaying the picture images.

11. A method of driving a picture image display device for displaying motion picture images according to claim 3, wherein a backward bias is applied to the quenched electro optical elements in the light quenching period.

4. 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:

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.

5. A method of driving a motion picture image display device according to claim 4, wherein the light quenching signal corresponds to a low voltage level data signal VDL.

6. A method of driving a motion picture image display device according to claim 4, 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 comprises 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.

7. A method of driving a motion picture image display device according to claim 4, 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 comprises 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.