LCD display with photo sensor touch function
First Claim
Patent Images
1. A liquid crystal display (LCD), comprising:
- (a) a panel having a display region and a peripheral region adjacent the display region, the panel having a plurality of pixels spatially arranged in the form of a matrix in the display region for displaying an image;
(b) a first photosensor member formed in the display region for sensing a change of incident light caused by a touch on the display region, wherein the first photosensor member comprises at least one photo transistor having a gate, a source and a drain, and is characterized with a sensitivity for sensing the change of the incident light, wherein the sensitivity varies with an intensity of ambient light and a voltage difference, Vgs, between the gate and the source of the at least one photo transistor, such that for each intensity value of the ambient light, there is a corresponding value of the voltage difference Vgs for the first photosensor member to operate at an optimal sensitivity, wherein Vgs=(Vg−
Vs), Vg and Vs being voltages respectively applied to the gate and the source of the at least one photo transistor;
(c) a second photosensor member formed in the peripheral region for measuring the intensity of the ambient light and generating an ambient light sensing signal corresponding to the measured intensity of the ambient light; and
(d) a lookup table (LUT) stored in a memory device, containing a number of intensity values of the ambient light, and corresponding values of the voltage difference Vgs for the first photosensor member to operate at the optimal sensitivity; and
(e) a sensor controller electrically coupled to the first photosensor member and the second photosensor member and in communication with the memory device, adapted for receiving the ambient light sensing signal from the second photosensor member, looking up a value of the voltage difference Vgs corresponding to the received ambient light sensing signal from the LUT, and regulating the voltages Vg and Vs respectively applied to the gate and the source of the at least one photo transistor of the first photosensor member according to the looked-up value of the voltage difference Vgs, so as to operate the first photosensor member at the optimal sensitivity.
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Abstract
The present invention relates to a method for driving a display device having a panel having a display region and a peripheral region, a first photosensor member formed in the display region, and a second photosensor member formed in the peripheral region. In one embodiment, the method includes the steps of measuring an intensity of ambient light by the second photosensor member, and driving the first photosensor member according to the measured intensity of the ambient light, so as to sense a change of incident light caused by a touch on the display region.
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Citations
17 Claims
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1. A liquid crystal display (LCD), comprising:
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(a) a panel having a display region and a peripheral region adjacent the display region, the panel having a plurality of pixels spatially arranged in the form of a matrix in the display region for displaying an image; (b) a first photosensor member formed in the display region for sensing a change of incident light caused by a touch on the display region, wherein the first photosensor member comprises at least one photo transistor having a gate, a source and a drain, and is characterized with a sensitivity for sensing the change of the incident light, wherein the sensitivity varies with an intensity of ambient light and a voltage difference, Vgs, between the gate and the source of the at least one photo transistor, such that for each intensity value of the ambient light, there is a corresponding value of the voltage difference Vgs for the first photosensor member to operate at an optimal sensitivity, wherein Vgs=(Vg−
Vs), Vg and Vs being voltages respectively applied to the gate and the source of the at least one photo transistor;(c) a second photosensor member formed in the peripheral region for measuring the intensity of the ambient light and generating an ambient light sensing signal corresponding to the measured intensity of the ambient light; and (d) a lookup table (LUT) stored in a memory device, containing a number of intensity values of the ambient light, and corresponding values of the voltage difference Vgs for the first photosensor member to operate at the optimal sensitivity; and (e) a sensor controller electrically coupled to the first photosensor member and the second photosensor member and in communication with the memory device, adapted for receiving the ambient light sensing signal from the second photosensor member, looking up a value of the voltage difference Vgs corresponding to the received ambient light sensing signal from the LUT, and regulating the voltages Vg and Vs respectively applied to the gate and the source of the at least one photo transistor of the first photosensor member according to the looked-up value of the voltage difference Vgs, so as to operate the first photosensor member at the optimal sensitivity. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method for driving a liquid crystal display (LCD), comprising the steps of:
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(a) providing an LCD comprising; (i) a panel having a display region and a peripheral region that is adjacent the display region, the panel having a plurality of pixels spatially arranged in the form of a matrix in the display region for displaying an image; (ii) a first photosensor member formed in the display region for sensing a change of incident light caused by a touch on the display region, wherein the first photosensor member comprises at least one photo transistor having a gate, a source and a drain, and is characterized with a sensitivity for sensing the change of the incident light, wherein the sensitivity varies with an intensity of ambient light and a voltage difference, Vgs, between the gate and the source of the at least one photo transistor, such that for each intensity value of the ambient light, there is a corresponding value of the voltage difference Vgs for the first photosensor member to operate at an optimal sensitivity, wherein Vgs=(Vg−
Vs), Vg and Vs being voltages respectively applied to the gate and the source of the at least one photo transistor;(iii) a second photosensor member formed in the peripheral region; (iv) a lookup table (LUT) stored in a memory device, containing a number of intensity values of the ambient light, and corresponding values of the voltage difference Vgs for the first photosensor member to operate at the optimal sensitivity; and (v) a sensor controller electrically coupled to the first photosensor member and the second photosensor member and in communication with the memory device; (b) measuring the intensity of ambient light and generating an ambient light sensing signal corresponding to the measured intensity of the ambient light by the second photosensor member; (c) receiving the ambient light sensing signal from the second photosensor member by the sensor controller; (d) regulating the voltages Vg and Vs according to the received ambient light sensing signal by the sensor controller; and (d) applying the regulated voltages Vg and Vs respectively to the gate and the source of the at least one photo transistor of the first photosensor member, so as to operate the first photosensor member at the optimal sensitivity. - View Dependent Claims (10)
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11. A method for driving a display device having a panel having a display region and a peripheral region, a first photosensor member comprising at least one photo transistor having a gate, a source and a drain, characterized with a sensitivity for sensing a change of an incident light, and formed in the display region, and a second photosensor member formed in the peripheral region, comprising the steps of:
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(a) providing a lookup table (LUT) containing a number of intensity values of ambient light, and corresponding values of a voltage difference, Vgs, between the gate and the source of the at least one photo transistor for the first photosensor member to operate at the optimal sensitivity, wherein the voltage difference Vgs=(Vg−
Vs), Vg and Vs being voltages respectively applied to the gate and the source of the at least one photo transistor;(b) measuring an intensity of ambient light by the second photosensor member; and (c) driving the first photosensor member to operate at the optimal sensitivity according to the measured intensity of the ambient light, so as to sense the change of the incident light caused by a touch on the display region. - View Dependent Claims (12, 13, 14, 15, 16, 17)
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Specification