Method for decreasing response time of circuit with resistance to light interference for infrared touch screen
An infrared touch screen, response time technology, applied in electrical digital data processing, data processing input/output process, instruments, etc., can solve the problem of long response time, reduce the response time, expand the scope of use, and improve the touch response speed. Effect
Active Publication Date: 2010-09-08
GENERALTOUCH TECH
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Problems solved by technology
Using this method is limited by the infrared receiving tube currently used in the infrared touch screen, and the rise and fall times of the received signal are on the order of 10us. In addition, to ensure the effectiveness of the inspection and adjustment unit, the useful signal frequency is between f and The optical interference signal frequency 1 / [2*(t2-t1)] cannot be too close, so the required response time is still long
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[0018] A method for reducing the response time of an anti-light interference circuit by an infrared touch screen, comprising a controller, an infrared receiving tube and an infrared transmitting tube, including the following steps: a, starting the infrared touch screen, initializing parameters, and simultaneously driving the first group of infrared receiving tubes to make it work In the receiving state, the optical interference signal is received, and after the infrared receiving tube receives the signal stably, the amplitude of the optical interference signal is sequentially stored in the capacitors corresponding to the infrared receiving tube through the multi-way switch A and the multi-way switch B; b, turn on in turn The infrared emitting tube in the first group drives the infrared receiving tube to work in the receiving state at the same time, and receives the optical interference signal and the effective signal. Subtract the current signal received by the first infrared r...
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The invention discloses a method for reducing the anti-optical interference circuit response time for an infrared touch screen, comprising the following steps: driving a first group of infrared receiving tubes and enabling the infrared receiving tube to work in the receiving state, and receiving the optical interference signals; after the infrared receiving tubes receive the signals and are stabilized, storing the optical interference signal amplitudes in the capacitors corresponding to the infrared receiving tube one by one through a multi-way switch A and a multi-way switch B; sequentially turning on the infrared receiving tubes in the first group, and driving the infrared receiving tubes to make the tube work in the receiving state to receive the optical interference signals and effective signals; after the infrared receiving tubes receive the signals and are stabilized, subtracting the optical interference signal stored in the corresponding capacitor from the current signal received by each infrared receiving tube so as to input an effective signal which is then sent to a signal processing circuit and stored; repeating the steps, and collecting all the effective signals received by all infrared receiving tubes, and storing the effective signals into the signal processing circuit. The invention can effectively remove the optical interference signals to enhance the touch response speed.
Description
technical field [0001] The invention relates to an infrared touch screen, in particular to a method for reducing the response time of an anti-light interference circuit by an infrared touch screen. Background technique [0002] In the existing infrared touch system, the sampling method is through the infrared emitting tubes and infrared receiving tubes arranged uniformly in the X and Y directions along the touch area, and the control and driving circuit drives the infrared emission under the control of the MCU execution code. The tube and the infrared receiving tube are scanned correspondingly to form an infrared matrix that crosses horizontally and vertically in the X direction and the Y direction. When there is a touch, fingers or other objects will block the horizontal and vertical infrared rays passing through the point, and the control system can judge the position of the touch point on the touch screen. [0003] The anti-light interference design is a technical proble...
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IPC IPC(8): G06F3/042
Inventor 蒲彩林沈海洋
Owner GENERALTOUCH TECH