Electronic device and liquid crystal display device
An electronic device includes a liquid crystal display panel having a display region disposed with a plurality of pixels, an image sensor disposed on the back side of the liquid crystal display panel and imaging the front direction through the liquid crystal display panel, and a lighting unit disposed between the liquid crystal display panel and the image sensor. The image sensor is disposed in a region overlapping the display region, and the lighting unit includes an optical modulation element disposed to overlap the display region and a light source for lighting the optical modulation element.
1. An electronic device, comprising:
a liquid crystal display panel having a display region disposed with a plurality of pixels;
an image sensor disposed on a back side of the liquid crystal display panel and imaging a front direction through the liquid crystal display panel; and
a lighting unit disposed between the liquid crystal display panel and the image sensor,
a first reflective polarizing plate disposed on the lighting unit side of the liquid crystal display panel; and
a second reflective polarizing plate disposed between the image sensor and an optical modulation element, wherein
the image sensor is disposed in a region overlapping the display region, and
the lighting unit includes the optical modulation element disposed to overlap with the display region and a light source for lighting the optical modulation element.
2. The electronic device according to claim 1 , wherein the optical modulation element is configured to have a scattering state for scattering light emitted from the light source in the direction of the liquid crystal display panel, and a transmission state for making a region overlapping the image sensor transparent and maintaining the scattering state in other regions.
3. The electronic device according to claim 2 , wherein the transmission state includes a partial transmission state for making a region overlapping the image sensor partly transparent.
4. The electronic device according to claim 2 , wherein
when the optical modulation element is in the scattering state, a video image is displayed on the liquid crystal display panel, and
when the optical modulation element is in the transmission state, the liquid crystal display panel performs white display in a region overlapping the image sensor, and the image sensor performs imaging.
5. The electronic device according to claim 1 , wherein the optical modulation element is a polymer dispersed liquid crystal panel.
6. The electronic device according to claim 1 , further comprising a transmissive polarizing plate disposed on a side of the liquid crystal display panel opposite to the first reflective polarizing plate,
wherein
a transmission polarization axes of the first reflective polarizing plate and the transmissive polarizing plate are disposed in a crossed Nicol's manner, and
a transmission polarization axis of the first reflective polarizing plate and the second reflective polarizing plate are disposed in parallel.
7. A liquid crystal display device comprising:
a liquid crystal display panel having a display region disposed with a plurality of pixels;
a lighting unit disposed to overlap the liquid crystal display panel;
a first reflective polarizing plate arranged on the lighting unit side of the liquid crystal display panel; and
a second reflective polarizing plate disposed between an image sensor and an optical modulation element, wherein
the lighting unit includes the optical modulation element disposed to overlap the display region, and a light source for illuminating the optical modulation element, and
the optical modulation element is configured to partially form a scattering state and a transmission state in a region overlapping the display region.
8. The liquid crystal display device according to claim 7 , wherein the optical modulation element is a polymer dispersed liquid crystal panel.
9. The liquid crystal display device according to claim 7 , further comprising
a transmissive polarizing plate disposed on a side of the liquid crystal display panel opposite to the second reflective polarizing plate,
wherein
a transmission polarization axes of the first reflective polarizing plate and the transmissive polarizing plate are disposed in a crossed Nicol's manner, and
a transmission polarization axis of the first reflective polarizing plate and that of the second reflective polarizing plate are disposed in parallel.