LCD APPARATUS WITH HEAT DISSIPATION ARRANGEMENTS

• US 20110037937A1
• Filed: 05/26/2009
• Published: 02/17/2011
• Est. Priority Date: 05/27/2008
• Status: Active Grant

• Current Assignee: Shenzhen New Super-Bright Lcd Display Co., Ltd.
• Original Assignee: Shenzhen New Supper-Bright LCD Display Company Limited
• Inventors: Xie, Nanfang, Kang, Cai, Yang, Yanming
• Granted Patent: US 8,471,997 B2
• Time in Patent Office: Days
• US Class Current: 349/161
• CPC Class Codes: G02F 1/133385 with cooling means, e.g. fans
• CPC Class Codes: G02F 2201/36 Airflow channels, e.g. constructional arrangements facilitating the flow of air
• CPC Class Codes: H05K 7/20972 Forced ventilation, e.g. on heat dissipaters coupled to components

Abstract

An LCD apparatus comprising an LCD screen, backlight arrangements for providing back illumination to the LCD screen, video processing circuitry and air moving devices, characterized in that the air moving devices are arranged to move air to condition the image displaying surface of the LCD screen. An LCD image displaying apparatus according to the present invention could operate at a brightness level of above 1000 nits, and even 3000 nits, which provides an astounding visual effect in the outdoor environment.

Claims

1. An LCD apparatus comprising an LCD screen, backlight arrangements for providing back illumination to the LCD screen, video processing circuitry and air moving devices, characterized in that the air moving devices are arranged to move air to condition the image-displaying surface of the LCD screen.

2. An LCD apparatus according to claim 1, wherein the apparatus comprises a transparent screen which is spaced apart from the image displaying surface of the LCD screen, characterized in that, the air moving devices are arranged to move air in the space between the transparent screen and the LCD screen to condition the LCD screen.

3. An LCD apparatus according to claim 2, wherein the backlight unit comprises a matrix of LEDs mounted on one side of a double sided metal coated board, and a heat sink is mounted on the other side of the double sided metal coated board, characterized in that metalised through holes connecting the two metal coated sides of the coated board are provided to transfer heat from the LEDs to the heat sink.

4. An LCD apparatus according to claim 3, wherein the heat sink is attached to the back of the backlight unit and comprises a plurality of substantially parallel and elongate heat dissipating fins, characterized in that the elongate heat dissipating fins extend substantially parallel to the direction of air flow and collectively define air flow channels to guide the movement of air due to the air moving devices.

5. An LCD apparatus according to claim 4, wherein the air moving devices are arranged to move external cooling air into the LCD apparatus via an entry at the bottom of the LCD screen and then to move the cooling air to the space between the LCD screen and the transparent screen to cool the LCD screen.

6. An LCD apparatus according to claim 5 wherein the air moving devices are further arranged to move the air leaving the space between the LCD screen and the transparent screen into the back of the backlight units to cool the heatsinks.

7. An LCD apparatus according to claim 4, wherein the air moving devices are arranged to move external cooling air into the display via the bottom of the display, to move the cooling air across the heat sink to cool the backlight unit, and then to move the warm air exiting from the heatsink to the space between the LCD screen and the transparent screen to warm the LCD screen.

8. An LCD apparatus according to claim 2, wherein the air moving devices are operable to change the direction of movement of air from between moving from the LCD screen to the heatsink and vice versa.

9. An LCD apparatus according to claim 2, wherein the LCD screen, the backlight arrangements, and the transparent screen are mounted on a housing, characterized in that the housing and the heatsinks collectively define a compartment, the compartment being communicable with the space between the LCD screen and the transparent screen via a passageway located between the top of the LCD screen and the housing, characterized in that, a plurality of air moving devices are distributed at the passageway to move air between the compartment and the space between the LCD screen and the transparent screen.

10. An LCD apparatus according to claim 2, wherein the air moving devices are arranged such that air enters at the bottom of the LCD display via a filtered entry and moves upwardly towards the heatsinks to dissipate heat from the heatsinks.

14. An LCD apparatus according to claim 3, wherein the air moving devices are arranged to move external cooling air into the display via the bottom of the display, to move the cooling air across the heat sink to cool the backlight unit, and then to move the warm air exiting from the heatsink to the space between the LCD screen and the transparent screen to warm the LCD screen.

15. An LCD apparatus according to claim 2, wherein the air moving devices are arranged to move external cooling air into the display via the bottom of the display, to move the cooling air across the heat sink to cool the backlight unit, and then to move the warm air exiting from the heatsink to the space between the LCD screen and the transparent screen to warm the LCD screen.

16. An LCD apparatus according to claim 1, wherein the air moving devices are arranged to move external cooling air into the display via the bottom of the display, to move the cooling air across the heat sink to cool the backlight unit, and then to move the warm air exiting from the heatsink to the space between the LCD screen and the transparent screen to warm the LCD screen.

17. An LCD apparatus according to claim 1, wherein the air moving devices are operable to change the direction of movement of air from between moving from the LCD screen to the heatsink and vice versa.

18. An LCD apparatus according to claim 1, wherein the LCD screen, the backlight arrangements, and the transparent screen are mounted on a housing, characterized in that the housing and the heatsinks collectively define a compartment, the compartment being communicable with the space between the LCD screen and the transparent screen via a passageway located between the top of the LCD screen and the housing, characterized in that, a plurality of air moving devices are distributed at the passageway to move air between the compartment and the space between the LCD screen and the transparent screen.

19. An LCD apparatus according to claim 1, wherein the air moving devices are arranged such that air enters at the bottom of the LCD display via a filtered entry and moves upwardly towards the heatsinks to dissipate heat from the heatsinks.

11. A backlight module for an LCD apparatus comprising a matrix of LEDs mounted on one side of a double sided metal coated board, and heat sinks mounted on another side of the double sided metal coated board, characterized in that metalised through holes connecting the two metal coated sides of the coated board are provided to transfer heat from the LEDs to the heat sink for dissipating heat generated by the backlight arrangements.

12. A backlight module according to claim 11, wherein the heat sink comprises a plurality of substantially parallel and elongate heat dissipating fins which collectively form air moving channels to guide movement of air for dissipating heat from the heatsinks.

13. A backlight module according to claim 12, wherein the one side of the double sided metal-coated board on which the LEDs are mounted is a printed circuit board.

20. A backlight module according to claim 11, wherein the one side of the double sided metal-coated board on which the LEDs are mounted is a printed circuit board.