DISPLAY SYSTEM

• US 20090102989A1
• Filed: 12/21/2006
• Published: 04/23/2009
• Est. Priority Date: 05/31/2006
• Status: Active Grant

• Current Assignee: Sharp Kabushiki Kaisha (Hon Hai Precision Industry Co., Ltd.)
• Original Assignee: Sharp Kabushiki Kaisha (Hon Hai Precision Industry Co., Ltd.)
• Inventors: Morishita, Katsuhiko, Sasaki, Takahiro, Kataoka, Yoshiharu, Sakai, Takehiko, Tsukamura, Chikanori, Chiba, Dai, Okazaki, Tsuyoshi
• Granted Patent: US 7,956,940 B2
• Time in Patent Office: Days
• US Class Current: 349/1
• CPC Class Codes: G02F 1/1323 Arrangements for providing a switchable viewing angle
• CPC Class Codes: G02F 1/133504 Diffusing, scattering, diffracting elements associated to illuminating devices G02F1/133606
• CPC Class Codes: G02F 1/133553 Reflecting elements associated to illuminating devices G02F1/133605
• CPC Class Codes: G02F 1/133562 on the viewer side
• CPC Class Codes: G02F 1/133616 Front illuminating devices
• CPC Class Codes: G02F 1/13476 in which at least one liquid crystal cell or layer assumes a scattering state
• CPC Class Codes: G02F 1/1393 the birefringence of the liquid crystal being electrically controlled, e.g. ECB-, DAP-, HAN-, PI-LC cells G02F1/1396, G02F1/141 take precedence
• CPC Class Codes: G07F 19/205 Housing aspects of ATMs

Abstract

A display system includes a liquid crystal display (10) including a backlight (3), a liquid crystal display panel (1), and a viewing angle control panel (2) for controlling the viewing angle of the display panel (1), the display system causing the amount of external light reflected by the liquid crystal display (10) to be relatively larger than the amount of light leaked from the backlight (3) onto the liquid crystal display panel (1). This provides a display system having an enhanced blocking effect.

Claims

1. A display system comprising a display device, said display device comprising:

a backlight;

a display panel; and

a viewing angle control panel for controlling a viewing angle of the display panel, said display system further comprising

a reflected light amount relative increasing section for causing an amount of external light reflected in the display device to be relatively larger than an amount of light leaked from the backlight in the display device.

2. The display system according to claim 1, wherein the reflected light amount relative increasing section includes a lighting section for turning on a light for increasing the amount of light reflected in the display device.

3. The display system according to claim 2, wherein the lighting section includes the light provided on at least one of four sides surrounding the display device.

4. The display system according to claim 2, wherein the lighting section includes the light provided so as to face a viewer using the display device.

5. The display system according to claim 2, wherein the display device further includes a touch panel which is provided on a front surface of the display panel and which allows signal input to be entered when part of the touch panel is touched, and the lighting section turns on the light when the tough panel is touched.

6. The display system according to claim 2, wherein the reflected light amount relative increasing section includes a human sensor for sensing presence of a person, and the lighting section turns on the light when the human sensor senses presence of a person.

7. The display system according to claim 2, wherein the display device is provided in a cash dispenser, and the lighting section turns on the light when a cash card is inserted in the cash dispenser.

8. The display system according to claim 1, wherein the reflected light amount relative increasing section includes a backlight luminance reducing section for reducing luminance of the backlight.

9. The display system according to claim 8, wherein the display device includes a touch panel which is provided on a front surface of the display panel, and which allows signal input to be entered when part of the touch panel is touched, and the backlight luminance reducing section reduces the luminance of the backlight when the touch panel is touched.

10. The display system according to claim 8, wherein the reflected light amount relative increasing section includes a human sensor for sensing presence of a person, and the backlight luminance reducing section reduces the luminance of the backlight when the human sensor senses presence of a person.

11. The display system according to claim 8, wherein the display device is provided in a cash dispenser, and the backlight luminance reducing section reduces the luminance of the backlight when a cash card is inserted in the cash dispenser.

12. The display system as set forth in claim 6, wherein the human sensor senses the presence of a person with use of infra-red radiation.

13. The display system according to claim 12, wherein the human sensor senses presence of a person operating the display device.

14. The display system according to claim 12, wherein the human sensor senses presence of a person present behind a person operating the display device.

15. The display system according to claim 2, wherein the reflected light amount relative increasing section further includes an ambient illuminance sensor for sensing ambient illuminance of the display device, and the lighting section turns on the light when illuminance sensed by the ambient illuminance sensor is not more than a set value.

16. The display system according to claim 8, wherein the reflected light amount relative increasing section further includes an ambient illuminance sensor for sensing ambient illuminance of the display device, and the backlight luminance reducing section reduces the luminance of the backlight when illuminance sensed by the ambient illuminance sensor is not more than a set value.

17. The display system according to claim 1, wherein the reflected light amount relative increasing section includes a polarizing plate, provided on a front surface of the display device, which has been subjected to a diffusion treatment.

18. The display system as set forth in claim 1, wherein the reflected light amount relative increasing section further includes, in at least a part of an area surrounding the display device, a reflective member for increasing the amount of light reflected in the display device.

19. The display system according to claim 18, wherein the reflective member is provided so as to face a viewer using the display device.

20. The display system according to claim 18, wherein the reflective member is a reflective plate which faces, at a variable angle, the display device.

21. The display system according to claim 1, wherein

the viewing angle control panel includes:

a liquid crystal cell comprising;

a pair of transparent substrates; and

a liquid crystal layer provided between the transparent substrates, the liquid crystal layer having liquid crystal molecules aligned vertically, and

a driving circuit for applying a voltage to the liquid crystal layer,

the liquid crystal cell being provided between two polarizing plates which are provided to face each other so that polarizing transmission axes are substantially at right angle, and

the driving circuit changes an alignment of the liquid crystal molecules in the liquid crystal layer of the liquid crystal cell so that a display state is switched between a first viewing angle range and a second viewing angle range which is within the first viewing angle range and is narrower than the first viewing angle range.

22. The display system according to claim 1, wherein the display panel is a liquid crystal display panel.

23. The display system as set forth in claim 10, wherein the human sensor senses the presence of a person with use of infra-red radiation.

24. The display system according to claim 23, wherein the human sensor senses presence of a person operating the display device.

25. The display system according to claim 23, wherein the human sensor senses presence of a person present behind a person operating the display device.