Liquid crystal display device having optical sensor

摘要

A liquid crystal display device which includes a pair of substrates, a pixel including a liquid crystal element between the pair of substrates, a lighting portion provided on the outer side of the pair of substrates, a first polarizing member between the pair of substrates and the lighting portion, a reflective member provided outside the lightning portion, a second polarizing member on a side opposite to the first polarizing member with the pair of substrates provided therebetween, and a first optical sensor and a second optical sensor. The first optical sensor has a function of detecting illuminance of external light, and the second optical sensor has a function of detecting a color tone of polarized light emitted from the pixel portion. The lightning portion can emits light having a predetermined wavelength depending on the color tone of the pixel portion which is detected by the second optical sensor.

主权项

1. A liquid crystal display device comprising:
a pair of light-transmitting substrates; a pixel portion provided between the pair of light-transmitting substrates; a monitoring pixel portion provided between the pair of light-transmitting substrates, the monitoring pixel portion comprising a first electrode, a second electrode and a liquid crystal layer between the first electrode and the second electrode; a lighting portion; a first polarizing member; a second polarizing member facing the first polarizing member with the pair of light-transmitting substrates provided therebetween; a reflective member facing the second polarizing member with the pair of light-transmitting substrates, the first polarizing member and the lighting portion provided therebetween; a first optical sensor, wherein the first optical sensor does not overlap with the pixel portion and the monitoring pixel portion; a second optical sensor facing the reflective member with the second polarizing member, the pair of light-transmitting substrates, the liquid crystal layer of the monitoring pixel portion, the second polarizing member and the lighting portion provided therebetween; and a sensor control portion, wherein the pixel portion comprises a transistor and a pixel electrode electrically connected to the transistor, wherein the first optical sensor is configured to detect illuminance of external light, wherein the reflective member is configured to reflect external light and to make light incident on the pixel portion, wherein the second optical sensor is configured to detect a color tone of light from the lighting portion and external light which are transmitted through the first polarizing member, the liquid crystal layer and the second polarizing member, wherein the sensor control portion is operationally connected to the first optical sensor, the second optical sensor, the monitoring pixel portion, and a lighting control portion, wherein the sensor control portion is configured to feed signals from the first optical sensor and the second optical sensor to the lighting control portion, wherein the sensor control portion is configured to send a signal for emission of light correcting a change in the color tone of at least one of light from the lighting portion and external light to the lighting control portion when the second optical sensor detects the change in the color tone of at least one of light from the lighting portion and external light, wherein the sensor control portion is configured to feed a signal from the first optical sensor to the lighting control portion configured to control the lighting portion to change a display mode into a reflective type that does not use light emitted from the lighting portion, wherein the lighting portion is configured to emit light when the first optical sensor detects illuminance which is too low to display an image by the reflective type, wherein the lighting portion is configured to stop emitting light from the lighting portion in accordance with the signal from the first optical sensor to change the display mode into the reflective type that does not use light emitted from the lighting portion for displaying an image, and wherein the liquid crystal display device is configured to switch the display mode between the reflective type and a transmissive type depending on illuminance of external light which is detected by the first optical sensor.