LIQUID CRYSTAL DISPLAY WITH BUILT-IN TOUCH SCREEN
First Claim
1. A liquid crystal display (LCD) with a built-in touch screen, the LCD comprising:
- a first substrate comprising a pixel area having a plurality of pixels to display an image, and a sensor area adjacent to the pixel area and having a plurality of photosensors to sense a position of a contact object;
a second substrate positioned over the first substrate, the second substrate comprising a color filter in an area corresponding to the pixel area on a first surface of the second substrate facing the first substrate, a light receiving portion, onto which external light is incident, in an area of the first surface corresponding to the sensor area, and a transparent electrode layer and a front polarizing plate sequentially stacked on a second surface of the second substrate opposite to the first surface;
an LCD panel comprising a liquid crystal layer interposed between the first and second substrates; and
a touch screen driver circuit to sense a capacitance variation provided through a first sensing line connected to the transparent electrode layer when the contact object is in contact with the LCD panel, and to output position information of the contact object, sensed by using optical information sensed through a second sensing line connected to the plurality of photosensors when the capacitance variation is greater than or equal to a predetermined threshold value.
2 Assignments
0 Petitions
Accused Products
Abstract
A liquid crystal display (LCD) with a built-in touch screen includes: a first substrate including a pixel area having a plurality of pixels and a sensor area having a plurality of photosensors; a second substrate positioned over the first substrate, and including a color filter, a light receiving portion, a transparent electrode layer, and a front polarizing plate; an LCD panel including a liquid crystal layer interposed between the first and second substrates; and a touch screen driver circuit to sense a capacitance variation provided through a first sensing line connected to the transparent electrode layer when an object is in contact with the LCD panel, and to output position information of the object, sensed by using optical information sensed through a second sensing line connected the plurality of photosensors when the capacitance variation is greater than or equal to a predetermined threshold value.
58 Citations
20 Claims
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1. A liquid crystal display (LCD) with a built-in touch screen, the LCD comprising:
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a first substrate comprising a pixel area having a plurality of pixels to display an image, and a sensor area adjacent to the pixel area and having a plurality of photosensors to sense a position of a contact object; a second substrate positioned over the first substrate, the second substrate comprising a color filter in an area corresponding to the pixel area on a first surface of the second substrate facing the first substrate, a light receiving portion, onto which external light is incident, in an area of the first surface corresponding to the sensor area, and a transparent electrode layer and a front polarizing plate sequentially stacked on a second surface of the second substrate opposite to the first surface; an LCD panel comprising a liquid crystal layer interposed between the first and second substrates; and a touch screen driver circuit to sense a capacitance variation provided through a first sensing line connected to the transparent electrode layer when the contact object is in contact with the LCD panel, and to output position information of the contact object, sensed by using optical information sensed through a second sensing line connected to the plurality of photosensors when the capacitance variation is greater than or equal to a predetermined threshold value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A liquid crystal display (LCD) with a built-in touch screen, the LCD comprising:
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a first substrate comprising a pixel area having a plurality of pixels to display an image, and a sensor area adjacent to the pixel area and having a plurality of photosensors to sense a position of a contact object; a second substrate positioned over the first substrate, the second substrate comprising a transparent electrode layer; an LCD panel comprising a liquid crystal layer interposed between the first and second substrates; and a touch screen driver circuit to sense a capacitance variation provided through a first sensing line connected to the transparent electrode layer when the contact object is in contact with the LCD panel, and to output position information of the contact object, sensed by using optical information sensed through a second sensing line connected the plurality photosensors when the capacitance variation is greater than or equal to a predetermined threshold value. - View Dependent Claims (14, 15, 16)
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17. A touch screen driver circuit of a liquid crystal display (LCD) with an LCD panel, a plurality of photosensors on a first substrate to sense a position of a contact object in contact with the LCD panel, and a transparent electrode layer on a second substrate, the touch screen driver circuit comprising:
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a controller to sense a capacitance variation provided through a first sensing line connected to the transparent electrode layer when the contact object is in contact with the LCD panel; and a position sensor to output position information of the contact object, sensed by using optical information sensed through a second sensing line connected to the plurality of photosensors when the capacitance variation is greater than or equal to a predetermined threshold value. - View Dependent Claims (18, 19, 20)
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Specification