Display

• US 20070188441A1
• Filed: 02/02/2007
• Published: 08/16/2007
• Est. Priority Date: 02/10/2006
• Status: Abandoned Application

• Current Assignee: Japan Display West Incorporated (Japan Display Incorporated)
• Original Assignee: Sanyo Epson Imaging Devices Corporation (Seiko Group)
• Inventors: Tanaka, Toshihiko, Kunimori, Takashi, Yasumori, Masanori, Sano, Yutaka
• Application Number:
  US11/701,498
• Publication Number:
  US 20070188441A1
• Time in Patent Office: Days
• US Class Current: 345/102
• CPC Class Codes: G02F 1/13318 Circuits comprising a photodetector
• CPC Class Codes: G02F 2201/58 Arrangements comprising a monitoring photodetector
• CPC Class Codes: G09G 2360/144 the light being ambient light
• CPC Class Codes: G09G 3/3406 Control of illumination source illumination devices structurally associated with liquid crystal cells G02F1/1336

Abstract

A display 10 according to one embodiment of the invention includes a display panel having an active matrix substrate and a color filter substrate, a lighting unit for the display panel, ambient light photosensors 32₁ to 32₆, a controller that controls luminous intensity of the lighting unit based on outputs from the ambient light photosensors 32₁ to 32₆, and a spectral sensitivity adjustor provided at a position on the color filter substrate corresponding to the ambient light photosensors 32₁ to 32₆ in order to make the spectral sensitivity of the ambient light photosensors 32₁ to 32₆ match human visual sensitivity. The spectral sensitivity adjustor may be a color filter or a polarizing filter. The display thus structured automatically and stably controls on/off of its backlights depending on the brightness of the surroundings with a sensitivity corresponding to human visual sensitivity.

Claims

1. A display comprising:

a display panel having an active matrix substrate and a color filter substrate;

a lighting unit for said display panel;

a ambient light photosensor;

a controller that controls luminous intensity of said lighting unit based on an output from said ambient light photosensor; and

a spectral sensitivity adjustor for said ambient light photosensor provided at a position on said color filter substrate corresponding to said ambient light photosensor.

2. The display according to claim 1, wherein said spectral sensitivity adjustor is a color filter layer.

3. The display according to claim 2, wherein said color filter layer is in a combination of colors provided for each pixel within a display area on said display panel.

4. The display according to claim 2, wherein said color filter layer is in one of colors provided for each pixel within a display area on said display panel.

5. The display according to claim 1, wherein said spectral sensitivity adjustor is a polarizing filter layer.

6. The display according to claim 1, wherein said spectral sensitivity adjustor is a combination of a color filter layer and a polarizing filter layer.

7. The display according to claim 6, wherein said color filter layer is in a combination of colors provided for each pixel within a display area on said display panel.

8. The display according to claim 6, wherein said color filter layer is in one of colors provided for each pixel within a display area on said display panel.

9. The display according to claim 1, wherein said ambient light photosensor includes a plurality of thin-film field effect transistors,

in each of which a source electrode, a gate electrode, and a drain electrode are coupled in parallel to each other, a capacitor is coupled between said source electrode and said drain electrode, and a switching element is coupled between said source electrode and a predetermined constant voltage source.

10. The display according to claim 1, wherein said lighting unit is a backlight or a side light, and said display is a transmissive liquid crystal display or a semi-transmissive liquid crystal display.

11. The display according to claim 1, wherein said lighting unit is a front light, and said display is a reflective liquid crystal display.