Electrooptic device and electronic device

Abstract

An electrooptic device includes: a first panel; a second panel on the back of the first panel; a first receiver circuit that measures a first ambient light incident on the first panel; a second receiver circuit that measures a second ambient light incident on the second panel; and a control circuit that measures the brightness of the environment where the first panel is placed on the basis of the luminance of the first ambient light whose ratio to that of the second ambient light is at or below a predetermined value, and that controls the display state of an image displayed on the first panel on the basis the brightness of the environment.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

The invention will be described with reference to the accompanying drawings, wherein like numbers reference like elements.

FIG. 1 is an exploded perspective view showing the structure of an electrooptic device according to a first embodiment of the invention.

FIG. 2 is a block diagram showing the electrical structure of the electrooptic device.

FIG. 3 is a diagram showing an example of the luminances of ambient lights measured by the first receiver circuit and the second receiver circuit.

FIG. 4 is a flowchart for a method for controlling the luminance of the illumination light of a back light unit.

FIG. 5A is a perspective view of a mobile phone which is an example of an electronic device having this electrooptic device.

FIG. 5B is a perspective view of the mobile phone in the folded state.

FIG. 6 is an exploded perspective view showing the structure of an electrooptic device according to a second embodiment of the invention.

FIG. 7 is a block diagram showing the electrical structure of the electrooptic device.

FIG. 8A is a perspective view of a mobile phone which is an example of an electronic device having the electrooptic device.

FIG. 8B is a perspective view of the mobile phone in the folded state.

Claims

1. An electrooptic device comprising: a first panel;a second panel on the back of the first panel;a first receiver circuit that measures a first ambient light incident on the first panel;a second receiver circuit that measures a second ambient light incident on the second panel; anda control circuit that measures the brightness of the environment where the first panel is placed on the basis of the luminance of the first ambient light whose ratio to that of the second ambient light is at or below a predetermined value, and that controls the display state of an image displayed on the first panel on the basis the brightness of the environment.

2. An electrooptic device comprising: a display panel having a predetermined display surface;a first receiver circuit that measures a first ambient light incident on the display surface of the display panel;a second receiver circuit that measures a second ambient light incident on the surface of the display panel opposite to the display surface; anda control circuit that measures the brightness of the environment where the display panel is placed on the basis of the luminance of the first ambient light whose ratio to that of the second ambient light is at or below a predetermined value, and that controls the display state of an image displayed on the display panel on the basis the brightness of the environment.

3. The electrooptic device according to claim 1, wherein the predetermined value is 10 to 1.

4. The electrooptic device according to claim 1, wherein the control circuit controls the display state of the image at three levels or more according to the brightness of the environment.

5. The electrooptic device according to claim 4, wherein the control circuit controls the display state of the image at two levels or more in the range from 100 lux to 1,000 lux.

6. The electrooptic device according to claim 1, comprising a lighting system that emits illumination light from the opposite side of the display surface,wherein the control circuit controls the luminance of the illumination light on the basis of the brightness of the environment.

7. The electrooptic device according to claim 1, wherein the control circuit controls the gray level of the image on the basis of the brightness of the environment.

8. An electronic device comprising the electrooptic device according to claim 1.