Systems for displaying images involving reduced mura

• US 20070241999A1
• Filed: 04/14/2006
• Published: 10/18/2007
• Est. Priority Date: 04/14/2006
• Status: Active Grant

• Current Assignee: InnoLux Corporation
• Original Assignee: Toppoly Optoelectronics Corporation (InnoLux Corporation)
• Inventors: Lin, Ching-Wei
• Granted Patent: US 7,652,646 B2
• Time in Patent Office: Days
• US Class Current: 345/76
• CPC Class Codes: G09G 2300/0819 used for counteracting undesired variations, e.g. feedback or autozeroing
• CPC Class Codes: G09G 2300/0842 forming a memory circuit, e.g. a dynamic memory with one capacitor
• CPC Class Codes: G09G 2300/0852 being a dynamic memory with more than one capacitor
• CPC Class Codes: G09G 2300/0861 with additional control of the display period without amending the charge stored in a pixel memory, e.g. by means of additional select electrodes
• CPC Class Codes: G09G 2310/0251 Precharge or discharge of pixel before applying new pixel voltage
• CPC Class Codes: G09G 2320/043 Preventing or counteracting the effects of ageing
• CPC Class Codes: G09G 3/2014 by modulation of the duration of a single pulse during which the logic level remains constant
• CPC Class Codes: G09G 3/3258 with pixel circuitry controlling the voltage across the light-emitting element
• CPC Class Codes: G09G 3/3291 in which the data driver supplies a variable data voltage for setting the current through, or the voltage across, the light-emitting elements

Abstract

Systems for displaying images are provided. A representative system incorporates a display device that includes a data line operative to provide display signals and sweep signals; a scan line operative to provide scan reset signals; a first capacitor having a first end coupled to the data line for storing charges from the signal line; a first inversion unit having an input end coupled to a second end of the first capacitor, a first supply end coupled to a first voltage source, a second supply end coupled to a second voltage source larger than the first voltage, and an output end; a first reset switch having a first end coupled between the second end of the first capacitor and the input end of the first inversion unit, a second end coupled to the output end of the first inversion unit, and a control end coupled to the scan line; a driving TFT having a control end coupled to the output end of the first inversion unit; and an illuminating unit coupled between a first end of the driving TFT and a third voltage source larger than or equal to the first voltage source.

Claims

1. A system for displaying images, comprising:

a display device, comprising;

a data line operative to provide display signals and sweep signals;

a scan reset line operative to provide scan reset signals;

a first capacitor having a first end coupled to the data line, the first capacitor being operative to store charges from the signal line;

a first inversion unit having an input end coupled to a second end of the first capacitor, a first supply end coupled to a first voltage source, a second supply end coupled to a second voltage source larger than the first voltage, and an output end;

a first reset switch having a first end coupled between the second end of the first capacitor and the input end of the first inversion unit, a second end coupled to the output end of the first inversion unit, and a control end coupled to the scan reset line;

a driving thin film transistor (TFT) having a control end coupled to the output end of the first inversion unit; and

an illuminating unit coupled between a first end of the driving TFT and a third voltage source larger than or equal to the first voltage source.

2. The system of claim 1 wherein a second end of the driving TFT is coupled to a fourth voltage source smaller than or equal to the second voltage source, and larger than the third voltage source.

3. The system of claim 2 further comprising a TFT coupled between the second end of the driving TFT and the fourth voltage source.

4. The system of claim 1 wherein a second end of the driving TFT is coupled to the second voltage source.

5. The system of claim 1 further comprising:

a data driving circuit coupled to the data line and operative to generate the display signals and the sweep signals; and

a gate driving circuit coupled to the scan reset line and operative to generate the scan reset signals.

6. The system of claim 5 further comprising a relay switch coupled between outputs of the data driving circuit and the data line and operative to control passages of the display signals and the sweep signals into the data line.

7. The system of claim 1 further comprising:

a second inversion unit having an input end coupled to the output end of the first inversion unit and an output end coupled to the control end of the driving TFT; and

a second reset switch having a first end coupled to the input end of the second inversion unit, a second end coupled to the output end of the second inversion unit, and a control end coupled to the scan reset line.

8. The system of claim 7 further comprising:

a second capacitor coupled between the output end of the first inversion unit and the input end of the second inversion unit.

9. The system of claim 7 wherein a first supply end of the second inversion unit is coupled to the first voltage source and a second supply end of the second inversion unit is coupled to the second voltage source.

10. The system of claim 7 wherein the second inversion unit includes a complementary metal oxide semiconductor (CMOS) inverter.

11. The system of claim 1 wherein the first inversion unit includes a CMOS inverter.

12. The system as claimed in claim 1, further comprising an electronic device, wherein the electronic device comprises:

the display device; and

a controller coupled to the display and operative to provide input to the display such that the display displays images.

13. A system for displaying images, comprising:

a first data line operative to provide display signals;

a second data line operative to provide sweep signals;

a scan line operative to provide scan signals;

a control switch having a control end coupled to the scan line, and a first end coupled to the first data line;

a capacitor coupled between the second data line and a second end of the control switch operative to provide charges from the first or second data line;

an inversion unit having an input end coupled to the capacitor, a first supply end coupled to a first voltage source, a second supply end coupled to a second voltage source larger than the first voltage, and an output end;

a driving TFT having a control end coupled to the output end of the inversion unit; and

an illuminating unit coupled between a first end of the driving TFT and a third voltage source larger than or equal to the first voltage source.

14. The system of claim 13 wherein a second end of the driving TFT is coupled to a fourth voltage source smaller than or equal to the second voltage source, and larger than the third voltage source.

15. The system of claim 13 wherein a second end of the driving TFT is coupled to the second voltage source.

16. The system of claim 13 further comprising:

a data driving circuit coupled to the first and second data lines operative to provide the display signals, the sweep signals, and a constant voltage; and

a gate driving circuit coupled to the scan line operative to provide the scan signals.

17. The system of claim 16 further comprising a relay switch coupled between outputs of the data driving circuit and the second data line operative to provide passages of the display signals and the constant voltage into the second data line.

18. The system of claim 13, further comprising an electronic device, wherein the electronic device comprises:

the display device; and

a controller coupled to the display device and operative to provide input to the display device such that the display device displays images.

19. A system for displaying images comprising:

a pixel having a driving TFT, the driving TFT being operative to control illumination of the pixel;

a data line operative to provide display signals and sweep signals to the pixel; and

a scan reset line operative to provide scan reset signals to the pixel;

wherein the driving TFT has a linear region and a saturation region and the driving TFT exhibits an operating point within the linear region.

20. The system of claim 19, wherein:

the system further comprises an active-matrix organic light-emitting display (AMOLED); and

the pixel is a portion of the AMOLED.