Liquid crystal display device having temperature control system

• US 7,916,264 B2
• Filed: 10/29/2007
• Issued: 03/29/2011
• Est. Priority Date: 10/27/2006
• Status: Active Grant

• Current Assignee: InnoLux Corporation
• Original Assignee: Chi Mei Innolux Corporation (InnoLux Corporation), Innocom Technology (Shenzhen) Co., Ltd. (InnoLux Corporation)
• Inventors: Chen, Xin-Sheng, Yu, Guo-Hua
• Primary Examiner(s): NGO, HUYEN LE
• Application Number:
  US11/978,470
• Publication Number:
  US 20080100791A1
• Time in Patent Office: 1,247 Days
• Field of Search: 349/161, 349/187, 250/330, 250/338.1
• US Class Current: 349/161
• CPC Class Codes: G02F 1/133382 Heating or cooling of liquid crystal cells other than for activation, e.g. circuits or arrangements for temperature control, stabilisation or uniform distribution over the cell

Abstract

An exemplary liquid crystal display device (2) includes a liquid crystal panel (21) and a heating system. The heating system heats the liquid crystal panel when the temperature of the liquid crystal panel is below a predetermined threshold temperature. The liquid crystal display device can work normally without being adversely influenced by the surrounding temperature.

Claims

1. A liquid crystal display device, comprising:

a liquid crystal panel; and

a heating system;

wherein the heating system heats the liquid crystal panel when the temperature of the liquid crystal panel is below a predetermined threshold temperature;

wherein the heating system comprises a temperature sensor for detecting the temperature of the liquid crystal panel;

wherein the heating system further comprises a set of infrared ray-emitting diodes for emitting infrared rays according to the temperature of the liquid crystal panel;

wherein the heating system further comprises an infrared ray absorbing film for converting the infrared rays energy into thermal energy for heating the liquid crystal panel.

2. The liquid crystal display device as claimed in claim 1, further comprising a backlight module providing surface light to illuminate the liquid crystal panel.

3. The liquid crystal display device as claimed in claim 2, wherein the backlight module comprises a light source and a light guide plate for guiding the light beams emitted by the light source to illuminate the liquid crystal panel.

4. The liquid crystal display device as claimed in claim 3, wherein the light guide plate comprises a light incident surface, the light source is a set of light emitting diodes and is arranged adjacent to the light incident surface of the light guide plate.

5. The liquid crystal display device as claimed in claim 4, wherein the infrared ray-emitting diodes are arranged adjacent to the light incident surface of the light guide plate, and each of the infrared ray-emitting diodes is arranged alternately with one of the light emitting diodes of the light source.

6. The liquid crystal display device as claimed in claim 3, wherein the light guide plate further comprises a light emitting surface, the infrared ray absorbing film is arranged between the light emitting surface and the liquid crystal panel.

7. The liquid crystal display device as claimed in claim 1, wherein the temperature sensor is arranged at the edge of the liquid crystal panel.

8. The liquid crystal display device as claimed in claim 1, wherein the heating system heats the liquid crystal panel when the temperature of the liquid crystal panel is below −

10°

C.

9. A liquid crystal display device, comprising:

a liquid crystal panel; and

a temperature control system for maintaining the temperature of the liquid crystal panel in a predetermined range;

wherein the temperature control system comprises a temperature sensitive element for detecting the temperature of the liquid crystal panel;

wherein the temperature control system further comprises a heating system for heating the liquid crystal panel according to the temperature of the liquid crystal panel;

wherein the heating system comprises an infrared rays emitting element and an energy-conversion element, the infrared rays emitting element emits infrared rays, the energy-conversion element converts the energy of the infrared rays into thermal energy in order to heat the liquid crystal panel.

10. The liquid crystal display device as claimed in claim 9, wherein the temperature sensitive element is arranged on the edge of the liquid crystal panel.

11. The liquid crystal display device as claimed in claim 9, wherein the infrared rays emitting element is a set of infrared ray-emitting diodes.

12. The liquid crystal display device as claimed in claim 9, wherein the energy-conversion element is an infrared ray absorbing film adjacent to the liquid crystal panel.

13. A liquid crystal display device, comprising:

a liquid crystal panel;

a backlight module comprising;

a light source;

a light guide plate for guiding light beams emitted by the light source to illuminate the liquid crystal panel, the light guide plate comprising a light incident surface facing the light source and a light emitting surface facing the liquid crystal panel; and

an infrared rays emitting element adjacent to the light guide plate;

wherein when the temperature of the liquid crystal panel is below a predetermined threshold temperature, the infrared rays emitting element emits infrared rays, the infrared rays transmitting though the light guide plate and heating the liquid crystal panel.

14. The liquid crystal display device of claim 13, further comprising a temperature sensitive element for detecting the temperature of the liquid crystal panel.

15. The liquid crystal display device of claim 14, further comprising an energy-conversion element for converting at least part of energy of the infrared rays into thermal energy for heating the liquid crystal panel.

16. The liquid crystal display device of claim 13, wherein the infrared rays emitting element heats the liquid crystal panel when the temperature of the liquid crystal panel is below −

10°

C.

17. The liquid crystal display device of claim 13, wherein the temperature sensitive element is arranged on an edge of the liquid crystal panel.

18. The liquid crystal display device of claim 13, wherein the infrared rays emitting element is a set of infrared ray-emitting diodes.

19. The liquid crystal display device of claim 15, wherein the energy-conversion element is an infrared ray absorbing film adjacent to the liquid crystal panel.