Touch sensing system and display apparatus employing the same
First Claim
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1. A touch sensing system which senses a touch position on a screen, comprising:
- a light source that emits light;
a light deflection unit that deflects the light emitted from the light source;
a light guide plate which is arranged opposite to the screen and which guides the light deflected by the light deflection unit to different positions on the screen according to an incident position of the deflected light and transmits an image entered from a display panel on the screen;
a light detector that receives at least part of the guided light that is reflected from the touch position on the screen;
a controller that calculates the touch position on the screen based on a point of time when the light detector detects the light; and
a synchronization signal detecting sensor that detects a leading edge of a synchronization signal of the light deflected in the light deflection unit.
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Abstract
A touch sensing system which senses a touch position on a screen, including a light source to emit light; a light deflection unit to deflect the light emitted from the light source, a light guide plate which is arranged opposite to the screen and guides the light deflected by the light deflection unit to different positions on the screen according to an incident position, a light detector to receive at least part of the light reflected in a touch position on the screen, and a controller to calculate the touch position on the screen based on a point of time when the light detector detects the light.
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Citations
14 Claims
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1. A touch sensing system which senses a touch position on a screen, comprising:
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a light source that emits light; a light deflection unit that deflects the light emitted from the light source; a light guide plate which is arranged opposite to the screen and which guides the light deflected by the light deflection unit to different positions on the screen according to an incident position of the deflected light and transmits an image entered from a display panel on the screen; a light detector that receives at least part of the guided light that is reflected from the touch position on the screen; a controller that calculates the touch position on the screen based on a point of time when the light detector detects the light; and a synchronization signal detecting sensor that detects a leading edge of a synchronization signal of the light deflected in the light deflection unit. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A display apparatus comprising:
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a screen to display an image and receive information on a touch position; a display panel which provides an image for the screen; and a touch sensing system which senses the touch position on the screen, wherein the touch sensing system comprises; a light source that emits light; a light deflection unit that deflects the light emitted from the light source; a light guide plate which is arranged opposite to the screen and which guides the light deflected by the light deflection unit to different positions on the screen according to an incident position of the deflected light and transmits an image entered from the display panel on the screen; a light detector that receives at least part of the guided light that is reflected from the touch position on the screen; a controller that calculates the touch position on the screen based on a point of time when the light detector detects the light; and a synchronization signal detecting sensor that detects a leading edge of a synchronization signal of the light deflected in the light deflection unit. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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Specification