Display substrate and liquid crystal display including the same

• US 20080303964A1
• Filed: 03/18/2008
• Published: 12/11/2008
• Est. Priority Date: 06/11/2007
• Status: Abandoned Application

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Min, Byung-chan, Lee, Kwang-sae, Kwag, Jin-oh
• Application Number:
  US12/077,380
• Publication Number:
  US 20080303964A1
• Time in Patent Office: Days
• US Class Current: 349/33
• CPC Class Codes: G02F 1/133397 for suppressing after-image or image-sticking
• CPC Class Codes: G09G 2300/0426 Layout of electrodes and connections
• CPC Class Codes: G09G 2310/0245 Clearing or presetting the whole screen independently of waveforms, e.g. on power-on G09G2310/063 takes precedence
• CPC Class Codes: G09G 2320/0257 Reduction of after-image effects
• CPC Class Codes: G09G 2330/02 Details of power systems and of start or stop of display operation
• CPC Class Codes: G09G 2330/027 Arrangements or methods related to powering off a display
• CPC Class Codes: G09G 3/3648 using an active matrix G09G3/367 - G09G3/3696 take precedence

Abstract

Provided are a display substrate capable of improving an afterimage phenomenon and a liquid crystal display (LCD) including the display substrate. The display substrate includes a substrate, a low-voltage pad which is formed on the substrate, a ground pad which is formed on the substrate and to which a ground voltage is applied, and a discharge pattern which is formed on the substrate and connects the low-voltage pad and the ground pad.

Claims

1. A display substrate comprising:

a substrate;

a voltage pad formed on the substrate;

a ground pad formed on the substrate; and

a discharge pattern formed on the substrate, the discharge pattern being connected to the voltage pad and the ground pad.

2. The display substrate of claim 1, wherein the discharge pattern comprises:

a first discharge contact connected to the voltage pad, a second discharge contact connected to the ground pad, and a discharge line connected to the first discharge contact and the second discharge contact in a serpentine shape.

3. The display substrate of claim 2, wherein:

the first discharge contact is formed on the voltage pad; and

the second discharge contact is formed on the ground pad.

4. The display substrate of claim 1, wherein the discharge pattern comprises at least one of chromium (Cr) and indium tin oxide (ITO).

5. The display substrate of claim 1, wherein the discharge pattern has a resistance in the range of about 80 kΩ

-120 kΩ

.

6. The display substrate of claim 1, further comprising:

a plurality of gate lines formed on the substrate;

a plurality of data lines formed on the substrate; and

a plurality of pixels respectively formed at intersections between the gate lines and the data lines.

7. The display substrate of claim 1, wherein a gate-off voltage is applied to the voltage pad.

8. A liquid crystal display (LCD) comprising:

a liquid crystal panel having a display portion and a non-display portion, the display portion including a plurality of gate lines, a plurality of data lines and a plurality of pixels; and

a discharge pattern formed on the non-display portion.

9. The LCD of claim 8, wherein the discharge pattern discharges to a ground a gate-off voltage which is applied to the gate lines.

10. The LCD of claim 8, wherein the discharge pattern comprises a first discharge contact to which a gate-off voltage is applied, a second discharge contact connected to ground, and a discharge line connected to the first discharge contact and the second discharge contact.

11. The LCD of claim 8, wherein:

the non-display portion includes a first voltage pad to which a gate-off voltage is applied and a first ground pad, and

the LCD further comprises a driving chip connected to the first voltage pad and to the first ground pad, the driving chip sequentially providing a gate-off voltage to the gate lines and a data voltage to the data lines.

12. The LCD of claim 11, wherein the discharge pattern is connected to the first voltage pad and the first ground pad.

13. The LCD of claim 12, wherein the discharge pattern comprises a first discharge contact which is formed on the first voltage pad, a second discharge contact which is formed on the first ground pad, and a discharge line which connects the first discharge contact and the second discharge contact.

14. The LCD of claim 11, wherein:

the non-display portion includes a second voltage pad connected to the first voltage pad and a second ground pad which is connected to the first ground pad; and

the LCD further comprises a circuit board which is connected to the second voltage pad and the second ground pad, and provides the gate-off voltage and the ground voltage.

15. The LCD of claim 14, wherein the discharge pattern connects the second voltage pad and the second ground pad.

16. The LCD of claim 15, wherein the discharge pattern comprises a first discharge contact which is formed on the second voltage pad, a second discharge contact which is formed on the second ground pad, and a discharge line which connects the first discharge contact and the second discharge contact.

17. The LCD of claim 8, wherein the discharge pattern comprises at least one of chromium (Cr) and ITO.

18. The LCD of claim 8, wherein the discharge pattern has a resistance in the range of from about 80 kΩ

-120 kΩ

.

19. A liquid crystal display (LCD) comprising:

a liquid crystal panel divided into a display portion and a non-display portion, the display portion including a plurality of gate lines, a plurality of data lines and a plurality of pixels, wherein the non-display portion includes a voltage pad, a ground pad and a discharge resistor which connects the voltage pad and the ground pad; and

a driving chip connected to the voltage pad and the ground pad, the driving chip sequentially providing the gate-off voltage to the gate lines and a data voltage to the data lines.

20. The LCD of claim 19, wherein a negative gate-off voltage is applied to the voltage pad.

21. The LCD of claim 19, wherein the discharge resistor is made of conductive metal and is formed in a serpentine shape.

22. The LCD of claim 19, wherein the discharge resistor has a resistance in the range of from about 80 kg-120 kΩ

.