LCD display with light sensor having a light blocking layer
An array substrate, a manufacturing method thereof, and a display device are provided. The array substrate includes a display area and a non-display area. The non-display area includes at least one light sensor each including a light blocking layer on a substrate and for blocking light emitted from a backlight source; an insulating layer on the light blocking layer; a amorphous silicon layer on the insulating layer at a location corresponding to the light blocking layer and for sensing external light; an input electrode and an output electrode on the amorphous silicon layer and not contacting each other. The input electrode and the output electrode both contact the amorphous silicon layer, a part of the amorphous silicon layer between the input electrode and the output electrode forms a conductive channel. The output electrode is connected with a photoelectric detection circuit for inputting drain current generated by the conductive channel into the photoelectric detection circuit.
1. An array substrate comprising a display area and a non-display area, wherein the non-display area comprises at least one light sensor, and each light sensor comprises:
a light blocking layer on a substrate for blocking light emitted from a backlight source;
an insulating layer on the light blocking layer;
an amorphous silicon layer on the insulating layer at a location corresponding to the light blocking layer and for sensing external light;
an input electrode and an output electrode on the amorphous silicon layer and not contacting each other, wherein the input electrode and the output electrode both contact the amorphous silicon layer, a part of the amorphous silicon layer between the input electrode and the output electrode forms a conductive channel; the output electrode is connected with a photoelectric detection circuit for inputting drain current generated by the conductive channel into the photoelectric detection circuit,
wherein the light blocking layer and a gate electrode of the TFT contained in the display area are in a same layer and of a same material,
wherein the array substrate further comprises a voltage source configured to supply a voltage greater than a turning on voltage of the light sensor to the input electrode; and
wherein the array substrate further comprises a voltage source configured to supply a voltage smaller than a pinch-off voltage of the light sensor and close to the same as a threshold voltage of the light sensor to the light blocking layer.
2. The array substrate of claim 1 , wherein an area covered by the light blocking layer is greater than an area covered by the amorphous silicon layer.
3. The array substrate of claim 2 , wherein the display area comprises a thin film transistor (TFT) for driving each pixel;
the insulating layer and a gate insulating layer of the TFT are a same structure layer;
the amorphous silicon layer and an active layer of the TFT are in a same layer and of a same material;
the input electrode and a source electrode of the TFT are in a same layer and of a same material;
the output electrode and a drain electrode of the TFT are in a same layer and of a same material.
4. The array substrate of claim 2 , wherein the light sensor further comprises a protection layer on the input electrode and the output electrode.
5. The array substrate of claim 1 , wherein the display area comprises a thin film transistor (TFT) for driving each pixel;
the insulating layer and a gate insulating layer of the TFT are a same structure layer;
the amorphous silicon layer and an active layer of the TFT are in a same layer and of a same material;
the input electrode and a source electrode of the TFT are in a same layer and of a same material;
the output electrode and a drain electrode of the TFT are in a same layer and of a same material.
6. The array substrate of claim 1 , wherein the light sensor further comprises a protection layer on the input electrode and the output electrode.
7. The array substrate of claim 6 , wherein the protection layer and a passivation layer in the display area are a same structure layer.
8. A display device comprising the array substrate of claim 1 .
9. The display device of claim 8 , wherein a window that allows external light to pass is disposed in the display device at a location corresponding to the light sensor, and the amorphous silicon layer in the light sensor is configured to sense external light through the window.