DISPLAY DEVICE

• US 20190318690A1
• Filed: 04/03/2019
• Published: 10/17/2019
• Est. Priority Date: 04/16/2018
• Status: Active Grant

• Current Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Original Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Inventors: LEE, Ju Hee, CHO, Dae Youn, PARK, Jong Woo, CHOI, Young Tae
• Granted Patent: US 11,250,775 B2
• Time in Patent Office: Days
• CPC Class Codes: G09G 2300/0413 Details of dummy pixels or dummy lines in flat panels
• CPC Class Codes: G09G 2300/0426 Layout of electrodes and connections
• CPC Class Codes: G09G 2300/0439 Pixel structures
• CPC Class Codes: G09G 2300/0809 Several active elements per pixel in active matrix panels
• 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 2310/0262 The addressing of the pixel, in a display other than an active matrix LCD, involving the control of two or more scan electrodes or two or more data electrodes, e.g. pixel voltage dependent on signals of two data electrodes
• CPC Class Codes: G09G 2310/0286 Details of a shift registers arranged for use in a driving circuit
• CPC Class Codes: G09G 2310/08 Details of timing specific for flat panels, other than clock recovery
• CPC Class Codes: G09G 3/3233 with pixel circuitry controlling the current through the light-emitting element
• CPC Class Codes: G09G 3/3266 Details of drivers for scan electrodes
• 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
• CPC Class Codes: H10K 59/131 Interconnections, e.g. wiring lines or terminals

Abstract

A display device includes a pixel, a first control pad, a second control pad, and a first dummy pad. The pixel may emit light with luminance corresponding to a data signal. Supply of the data signal to the pixel depends on a first control signal and a second control signal. The first control pad is connected to a first control line for supplying the first control signal. The second control pad is connected to a second control line for supplying the second control signal. The first dummy pad is positioned between the first control pad and the second control pad and may receive a first dummy signal. A voltage level of the first dummy signal is in a range from a voltage level of the first control signal to a voltage level of the second control signal.

Claims

1. A display device, comprising:

a pixel for emitting light with luminance corresponding to a data signal, wherein the pixel is controlled by a first control signal and a second control signal;

a first control line for transmitting the first control signal;

a second control line for transmitting the second control signal;

a first control pad electrically connected to the first control line for supplying the first control signal to the first control line;

a second control pad electrically connected to the second control line for supplying the second control signal to the second control line; and

a first dummy pad that is positioned between the first control pad and the second control pad and configured to receive a first dummy signal, wherein a voltage level of the first dummy signal is in a range from a voltage level the first control signal to a voltage level of the second control signal.

2. The display device of claim 1, wherein

the voltage level of the first dummy signal is an average of the voltage level of the first control signal and the voltage level of the second control signal.

3. The display device of claim 2, wherein

the voltage level of the first dummy signal is changed when at least one of the voltage level of the first control signal and the voltage level of the second control signal is changed.

4. The display device of claim 1, further comprising:

a second dummy pad that is positioned between the first dummy pad and the second control pad and configured to receive a second dummy signal, wherein a voltage level of the second dummy signal is in the range from the voltage level of the first control signal to the voltage level of the second control signal.

5. The display device of claim 4, wherein

when the first control signal and the second control signal have the same voltage level, the first dummy signal and the second dummy signal have the same voltage level.

6. The display device of claim 5, wherein

when the voltage level of the first control signal is greater than the voltage level of the second control signal, the voltage level of the first dummy signal is greater than the voltage level of the second dummy signal.

7. The display device of claim 6, wherein

when the voltage level of the second control signal is greater than the voltage level of the first control signal, the voltage level of the second dummy signal is greater than the voltage level of the first dummy signal.

8. The display device of claim 1, further comprising:

a first dummy line electrically connected to the first dummy pad, shorter than each of the first control line and the second control line, and positioned between the first control line and the second control line.

9. The display device of claim 8, further comprising a substrate, the substrate comprising:

a display area in which the pixel is positioned;

a non-display area surrounding the display area;

a pad area in which the first control pad, the second control pad, and the first dummy pad are positioned; and

a wire area that is positioned between the non-display area and the pad area,

wherein the first control line and the second control line are positioned in the pad area, the wire area, and the non-display area, and

the first dummy line is positioned in the pad area and the wire area without being positioned in the non-display area.

10. The display device of claim 1, further comprising:

a scan driver for supplying a scanning signal that determines whether to input the data signal to the pixel,

wherein the first control line is electrically connected to the scan driver.

11. The display device of claim 10, wherein

the second control line is electrically connected to the scan driver.

12. The display device of claim 10, further comprising:

a light emission control driver for supplying a light emission control signal that determines a light emitting starting point and a light emitting finishing point of the pixel,

wherein the second control line is electrically connected to the light emission control driver.

13. A display device, comprising:

a pixel;

a display area in which the pixel is positioned;

a non-display area surrounding the display area;

a first control pad;

a second control pad;

a first dummy pad;

a pad area in which the first control pad, the second control pad, and the first dummy pad are positioned;

a wire area positioned between the non-display area and the pad area;

a first control line extending from the first control pad and positioned in the pad area, the wire area, and the non-display area;

a second control line extending from the second control pad and positioned in the pad area, the wire area, and the non-display area; and

a first dummy line extending from the first dummy pad, positioned between the first control line and the second control line, and positioned in the pad area and the wire area without being positioned in the non-display area.

14. The display device of claim 13, further comprising:

a scanning line; and

a scan driver positioned in the non-display area and electrically connected to the pixel through the scanning line,

wherein the first control line is electrically connected to the scan driver.

15. The display device of claim 14, wherein

the second control line is electrically connected to the scan driver.

16. The display device of claim 13, further comprising:

a light emission control line; and

a light emission control driver positioned in the non-display area and electrically connected to the pixel through the light emission control line,

wherein the second control line is electrically connected to the light emission control driver.

17. The display device of claim 13, further comprising:

a second dummy pad positioned between the first dummy pad and the second control pad.

18. The display device of claim 17, further comprising:

a second dummy line extending from the second dummy pad and being shorter than the second control line.

19. A method of operating a display device, the method comprising:

providing a first control signal and a second control signal for controlling supply of a data signal to a pixel of the display device, wherein the pixel is configured to emit light with luminance corresponding to the data signal, wherein the first control signal is provided to a first control pad of the display device and transmitted through a first control line of the display device, and wherein the second control signal is provided to a second control pad of the display device and transmitted through a second control line of the display device; and

providing a first dummy signal to a first dummy pad, wherein the first dummy pad is positioned between the first control pad and the second control pad, and wherein a voltage level of the first dummy signal is in a range from a voltage level the first control signal to a voltage level of the second control signal.

20. The method of claim 19, wherein

the voltage level of the first dummy signal is an average of the voltage level of the first control signal and the voltage level of the second control signal.