Liquid crystal display with touch screen function and method for detecting external illuminance using the same
First Claim
1. An Liquid Crystal Display (LCD) with a touch screen function, comprising:
- an array substrate having a display region and a photosensitive region divided by data lines, scan lines, and common lines,wherein the photosensitive region comprises;
a switching element having a first terminal connected to an (n−
1)th scan line of the scan lines to receive a select signal and a second terminal connected to a readout system;
a charge storage element having a first terminal connected to a third terminal of the switching element and a second terminal connected to the common lines; and
a photosensitive element having a first terminal connected to an nth scan line of the scan lines and a second terminal connected to the first terminal of the charge storage element,wherein when the photosensitive element is turned on according to external illuminance, the charge storage element is discharged and the readout system detects a difference of external illuminance.
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Accused Products
Abstract
An Liquid Crystal Display (LCD) with a touch screen function includes an array substrate having a display region and a photosensitive region divided by data lines, scan lines, and common lines, wherein the photosensitive region includes a switching element having a first terminal connected to an (n−1)th scan line to receive a select signal and a second terminal connected to a readout system, a charge storage element having a first terminal connected to a third terminal of the switching element and a second terminal connected to the common lines, and a photosensitive element having a first terminal connected to an nth scan line and a second terminal connected to the first terminal of the charge storage element, wherein when the photosensitive element is turned on according to external illuminance, the charge storage element is discharged and the readout system detects a difference of external illuminance.
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Citations
15 Claims
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1. An Liquid Crystal Display (LCD) with a touch screen function, comprising:
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an array substrate having a display region and a photosensitive region divided by data lines, scan lines, and common lines, wherein the photosensitive region comprises; a switching element having a first terminal connected to an (n−
1)th scan line of the scan lines to receive a select signal and a second terminal connected to a readout system;a charge storage element having a first terminal connected to a third terminal of the switching element and a second terminal connected to the common lines; and a photosensitive element having a first terminal connected to an nth scan line of the scan lines and a second terminal connected to the first terminal of the charge storage element, wherein when the photosensitive element is turned on according to external illuminance, the charge storage element is discharged and the readout system detects a difference of external illuminance. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method for detecting a difference of external illuminance in a readout system when a photosensitive element is turned on according to the external illuminance and a charge storage element is discharged in an LCD with a touch screen function
comprising: -
an array substrate having a display region and a photosensitive region divided by data lines, scan lines, and common lines, in which a photosensitive region comprises a switching element having a first terminal connected to an (n−
1)th scan line of the scan lines to receive a select signal and a second terminal connected to a readout system;a charge storage element having a first terminal connected to a third terminal of the switching element and a second terminal connected to the common lines; and a photosensitive element having a first terminal connected to an nth scan line of the scan lines and a second terminal connected to the first terminal of the charge storage element, wherein when the photosensitive element is turned on according to external illuminance, the charge storage element is discharged and the readout system detects a difference of external illuminance, the method comprising; turning on the switching element and charging the charge storage element to a reference voltage of the readout system when an (n−
1)th scan line of scan lines is selected;turning on the photosensitive element and charging the charge storage element to a select voltage of an nth scan line of the scan lines when the nth scan line of the scan lines is selected; and detecting, when the (n−
1)th scan line of the scan lines is re-selected in a next frame and the switching element is turned on, the difference of external illuminance by measuring a discharge amount from the charge storage element to the readout system if a voltage stored in the charge storage element is higher than the reference voltage of the readout system and measuring a charge amount from the readout system to the charge storage element when a voltage stored in the charge storage element is lower than the reference voltage of the readout system. - View Dependent Claims (12, 13, 14, 15)
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Specification