CN203596003U - Light touch screen control circuit, device and system - Google Patents

Abstract

The utility model discloses an optical touch screen control circuit, a device and a system. The optical touch screen control circuit includes an optical sensing module for converting light energy into electrical energy, a conversion module for voltage conversion, and an optical sensing module for controlling The converted electric energy is output to the switch module at the input end of the conversion module, the control chip used to control the working state of the switch module, and the detection module used to detect whether the optical touch screen is touched; one end of the switch module is connected to the light sensing module One corresponding connection, the other end is connected to the input end of the conversion module, and when the switch module is turned on, the electric energy converted by the light sensing module is output to the input end of the conversion module; the input end of the detection module is connected to the input end of the conversion module. The light sensor module is connected, and the output terminal is connected with the control chip. The utility model reduces the waste of energy.

Description

Optical touch screen control circuit, device and system

technical field

The utility model relates to the technical field of electronic products, in particular to an optical touch screen control circuit, device and system.

Background technique

The optical touch screen is suitable for long-distance control, accurate positioning, and fast response. It has great application and development space in the fields of advertising, conferences, etc. The sensing device converts light energy into an electrical signal, and when the signal is not used for positioning, the energy converted by the light sensing device is not released, resulting in waste of energy.

Utility model content

The main purpose of the utility model is to provide an optical touch screen control circuit, aiming at reducing energy waste.

In order to achieve the above object, the utility model provides an optical touch screen control circuit, the optical touch screen control circuit includes a light sensing module for converting light energy into electrical energy, a conversion module for voltage conversion, and a light sensing module for controlling The converted electric energy is output to the switch module at the input end of the conversion module, the control chip used to control the working state of the switch module, and the detection module used to detect whether the optical touch screen is touched; one end of the switch module is connected to the light sensing module One corresponding connection, the other end is connected to the input end of the conversion module, and when the switch module is turned on, the electric energy converted by the light sensing module is output to the input end of the conversion module; the input end of the detection module is connected to the input end of the conversion module. The light sensor module is connected, and the output terminal is connected with the control chip.

Preferably, the switch module includes a first resistor and an electronic switch; wherein one end of the electronic switch is connected to the positive output end of the light sensing module, the other end is connected to the input end of the conversion module, and the control end is connected to the positive output end of the light sensing module. connected to the control chip; one end of the first resistor is connected to the input end of the conversion module, and the other end is grounded.

Preferably, the electronic switch is a first triode, and the first triode is an NPN transistor, the emitter of which is connected to the input terminal of the conversion module, the base is the control terminal of the electronic switch, and the collector is connected to the input terminal of the conversion module. Connect to the positive output terminal of the light sensing module.

Preferably, the detection module includes a second triode, a third triode, a second resistor and a third resistor; wherein the second triode is an NPN triode, and its collector is connected to that of the light sensing module The positive output terminal is connected, the base is connected to the control chip, the emitter is grounded through the second resistor; the third triode is an NPN triode, its collector is connected to the positive pole of the preset power supply, and the base is connected to the second The emitter of the triode is connected, the emitter is connected with the detection terminal of the control chip, and grounded through the third resistor.

Preferably, the optical touch screen control circuit further includes a first capacitor, one end of the first capacitor is connected to the input end of the conversion module, and the other end is grounded.

Preferably, the conversion module is a DC boost chip.

The utility model also provides an optical touch screen control device. The optical touch screen control device includes an optical touch screen and an optical touch screen control circuit. The optical touch screen control circuit includes an optical sensing module for converting light energy into electrical energy, and a A conversion module, a switch module for controlling the electrical energy converted by the light sensing module to output to the input end of the conversion module, a control chip for controlling the working state of the switch module, and a detection module for detecting whether the optical touch screen is touched; the switch One end of the module is connected to the photo-sensing module in one-to-one correspondence, and the other end is connected to the input end of the conversion module, and when the switch module is turned on, the electric energy converted by the photo-sensing module is output to the input of the conversion module terminal; the input terminal of the detection module is connected to the light sensing module, and the output terminal is connected to the control chip.

Preferably, the optical touch screen includes a backlight, a liquid crystal display panel and several light sensing modules, wherein the light sensing modules are located between the backlight and the liquid crystal display panel.

The utility model also provides an optical touch screen control system, the optical touch screen control system includes an optical touch screen control device, the optical touch screen control device includes an optical touch screen and an optical touch screen control circuit, and the optical touch screen control circuit includes a A light sensing module converted into electrical energy, a conversion module used for voltage conversion, a switch module used to control the output of the electric energy converted by the light sensor module to the input end of the conversion module, a control chip used to control the working state of the switch module, and a switch module used to detect A detection module for whether the optical touch screen is touched; one end of the switch module is connected to the light sensing module in one-to-one correspondence, and the other end is connected to the input end of the conversion module, and when the switch module is turned on, the light The electric energy converted by the sensing module is output to the input end of the conversion module; the input end of the detection module is connected to the light sensing module, and the output end is connected to the control chip.

Preferably, the optical touch screen includes a backlight, a liquid crystal display panel and several light sensing modules, wherein the light sensing modules are located between the backlight and the liquid crystal display panel.

The utility model controls the output of the electric energy of the light sensing module to the conversion module by setting the switch module, and the conversion module converts the electric energy generated by the light sensing module into a voltage suitable for load operation, thereby realizing the utilization of the electric energy generated by the light sensing module. Energy waste is thus reduced.

Description of drawings

FIG. 1 is a schematic diagram of the circuit structure of a preferred embodiment of the optical touch screen control circuit of the present invention.

The realization of the purpose of the utility model, functional characteristics and advantages will be further described in conjunction with the embodiments and with reference to the accompanying drawings.

Detailed ways

It should be understood that the specific embodiments described here are only used to explain the utility model, and are not intended to limit the utility model.

The utility model provides an optical touch screen control circuit.

Referring to FIG. 1 , FIG. 1 is a schematic circuit structure diagram of a preferred embodiment of the optical touch screen control circuit of the present invention. The optical touch screen control circuit provided in this embodiment includes an optical sensing module 10 for converting light energy into electrical energy, a conversion module 30 for voltage conversion, and an output of electrical energy converted by the optical sensing module 10 to the conversion module. The switch module 20 at the input end of 30, the control chip 40 for controlling the working state of the switch module 20 and the detection module 50 for detecting whether the optical touch screen is touched; one end of the switch module 20 is in one-to-one correspondence with the light sensing module 10 The other end is connected to the input end of the conversion module 30, and when the switch module 20 is turned on, the electric energy converted by the photosensitive module 10 is output to the input end of the conversion module 30; the detection module 50 inputs The terminal is connected to the light sensing module 10 , and the output terminal is connected to the control chip 40 .

In this embodiment, the above-mentioned light sensing module 10 is used for converting light energy into electric energy conversion device, which includes the positive output of the light sensing module 10 and the negative output of the light sensing module 10, wherein the positive output of the light sensing module 10 is respectively connected to the The switch module 20 is connected to the detection module 50, and the negative output terminal is grounded. Specifically, there are multiple light sensing modules 10 , the switch module 20 is connected to the light sensing modules 10 in a one-to-one correspondence, and the detection module 50 is also connected to the light sensing modules 10 in a one-to-one correspondence.

The above optical touch screen control circuit can control the optical touch screen to enter two working modes respectively, one is touch mode and the other is non-touch mode. For example, the remote control signal can be output to the optical touch screen control circuit through the external remote control, so as to control the working mode of the optical touch screen. When the optical touch screen enters the touch mode, the user can input operation instructions by emitting laser beams. When entering the non-touch mode, Operation instructions cannot be input through the optical touch screen.

When entering the touch mode, the control chip 40 outputs control signals to the switch module 20 and the detection module 50 respectively, and the switch module 20 controls the disconnection between the positive output terminal of the light sensing module 10 and the input terminal of the conversion module 30 according to the control signal , the detection module 50 starts to detect the voltage state of the positive input terminal of the photosensitive module 10 according to the control signal. level signal to the control chip 40. The control chip 40 analyzes the position of the cursor formed by the irradiation of the laser beam according to the received level signal. It should be noted that when in the touch mode, the detection module 50 does not detect the laser beam within a continuous preset period of time, the control chip 40 can also output a control signal to the switch module 20 to control the power output of the light sensing module 10 to The conversion module 30, the conversion module 30 converts the electric energy generated by the light sensing module 10 to supply power to the load.

When entering the non-touch mode, the control chip 40 outputs control signals to the switch module 20 and the detection module 50 respectively, and the switch module 20 controls the positive output terminal of the light sensing module 10 and the input terminal of the conversion module 30 according to the control signal to be normal. connected so as to output the electric energy formed by the positive output terminal of the photosensitive module 10 to the input terminal of the conversion module 30, and the conversion module 30 converts the electric energy into a voltage suitable for the load to supply power for the load. The detection module 50 stops detecting the voltage state of the positive input terminal of the light sensing module 10 according to the control signal.

The utility model controls the electric energy output of the light sensing module 10 to the conversion module 30 by setting the switch module 20, and the electric energy generated by the light sensing module 10 is converted into a voltage suitable for the load by the conversion module 30, thereby realizing the control of the light sensing module 10. The generated electric energy is utilized, thus reducing the waste of energy.

Further, based on the above embodiment, in this embodiment, the switch module 20 includes a first resistor R1 and an electronic switch Q1; wherein one end of the electronic switch Q1 is connected to the positive output end of the photosensitive module 10, and the other end It is connected to the input end of the conversion module 30 , and the control end is connected to the control chip 40 ; one end of the first resistor R1 is connected to the input end of the conversion module 30 , and the other end is grounded.

Specifically, the electrical components of the above-mentioned electronic switch Q1 can be set according to actual needs. In this embodiment, preferably, the above-mentioned electronic switch Q1 is a first triode, and the first triode is an NPN transistor, and its emitter and The input terminal of the conversion module 30 is connected, the base is connected to the control terminal of the electronic switch Q1 , and the collector is connected to the positive output terminal of the light sensing module 10 .

In this embodiment, when the control chip 40 outputs a low-level control signal to the base of the first triode, the first triode will be in an off state; when the control chip 40 outputs a high-level control signal When reaching the base of the first triode, the first triode will be in a conduction state. At this time, each photosensitive module 10 outputs the converted electric energy to the input end of the conversion module 30, and the input terminal of the input end by the conversion module 30 After the voltage is adjusted, it is output from the output terminal to the corresponding load to supply power for the load.

Further, based on the above embodiment, in this embodiment, the detection module 50 includes a second transistor Q2, a third transistor Q3, a second resistor R2, and a third resistor R3; wherein the second transistor Q2 is an NPN triode, its collector is connected to the positive output terminal of the photosensitive module 10, its base is connected to the control chip 40, and its emitter is grounded through the second resistor R2; the third transistor Q3 is NPN The triode, its collector is connected to the positive pole of the preset power supply (+5V power supply), the base is connected to the emitter of the second triode Q2, the emitter is connected to the detection terminal of the control chip 40, and passed through the second transistor Q2 Three resistors R3 are grounded.

In this embodiment, when the above-mentioned control chip 40 outputs a low-level control signal to the base of the second transistor Q2, the second transistor Q2 will be in a cut-off state; the control chip 40 and the third transistor Q2 One end of Q3's emitter connection always receives a low signal. When the above-mentioned control chip 40 outputs a high-level control signal to the base of the second transistor Q2, the second transistor Q2 will be in a conduction state. If the laser beam is not incident on the photosensitive module 10 , the voltage across the second resistor R2 is less than the conduction voltage of the third triode Q3, if the laser beam is incident on the photo-sensing module 10, the voltage on the corresponding photo-sensing module 10 will increase, so that the corresponding The voltage across the second resistor R2 is greater than the voltage of the third transistor Q3, causing the third transistor Q3 to be turned on, so that the end of the control chip 40 connected to the emitter of the third transistor Q3 receives a high level Signal. The control chip 40 analyzes the irradiation position of the laser beam according to the pin receiving the high level signal.

Further, based on the above embodiment, in this embodiment, the optical touch screen control circuit further includes a first capacitor C1, one end of the first capacitor C1 is connected to the input end of the conversion module 30, and the other end is grounded.

In this embodiment, the above-mentioned first capacitor C1 is used for filtering, which can improve the stability of the voltage input to the input end of the conversion module 30 .

It should be noted that the circuit structure of the conversion module 30 can be set according to actual needs. In this embodiment, in order to reduce the difficulty of circuit design, the conversion module 30 can be a DC boost chip, such as SP6641.

The utility model also provides an optical touch screen control device. The optical touch screen control device includes an optical touch screen and an optical touch screen control circuit. The structure of the optical touch screen control circuit can refer to the above-mentioned embodiments, and will not be repeated here. Reasonably, since the optical touch screen control device of this embodiment adopts the technical solution of the above optical touch screen control circuit, the optical touch screen control device has all the beneficial effects of the above optical touch screen control circuit.

Specifically, the optical touch screen includes a backlight source, a liquid crystal display panel, and several light sensing modules, wherein the light sensing modules are located between the backlight source and the liquid crystal display panel. In this embodiment, since the liquid crystal display panel has a certain transmittance, the light sensor module is arranged between the backlight source and the liquid crystal display panel, so that the light from the backlight source can directly hit the light sensor module, effectively preventing the light from passing through the light sensor module. The transmission loss caused by the liquid crystal display panel reaching the light sensing module after transmission, therefore, the optical touch screen control device provided in this embodiment can further improve the utilization rate of light energy.

The utility model also provides an optical touch screen control system. The optical touch screen control system includes an optical touch screen control device. The structure of the optical touch screen control device can refer to the above-mentioned embodiments, and will not be repeated here. Reasonably, since the optical touch screen control system of this embodiment adopts the technical solution of the above optical touch screen control device, the optical touch screen control system has all the beneficial effects of the above optical touch screen control device.

The above are only preferred embodiments of the present utility model, and are not intended to limit the patent scope of the present utility model. Any equivalent structure or equivalent process conversion made by using the description of the utility model and the contents of the accompanying drawings, or directly or indirectly used in other related All technical fields are all included in the scope of patent protection of the utility model in the same way.

Claims (10)

1. an optical touch screen control circuit, it is characterized in that, comprise for the photoinduction module that is electric energy by light energy conversion, for the modular converter of voltage transitions, export the switch module of described modular converter input end to for controlling the electric energy of photoinduction module converts, for the control chip of gauge tap module duty and the detection module that whether is touched for detection of optical touch screen; One end of described switch module and described photoinduction module connect one to one, and the other end is connected with the input end of modular converter, and in the time of described switch module conducting, the electric energy that described photoinduction module converts is obtained exports the input end of modular converter to; Described detection module input end is connected with described photoinduction module, and output terminal is connected with described control chip.

2. optical touch screen control circuit as claimed in claim 1, is characterized in that, described switch module comprises the first resistance and electronic switch; One end of wherein said electronic switch is connected with the positive output end of described photoinduction module, and the other end is connected with the input end of described modular converter, and control end is connected with described control chip; One end of described the first resistance is connected with the input end of described modular converter, other end ground connection.

3. optical touch screen control circuit as claimed in claim 2, it is characterized in that, described electronic switch is the first triode, described the first triode is NPN triode, its emitter is connected with the input end of described modular converter, base stage is the control end of electronic switch, and collector is connected with the positive output end of described photoinduction module.

4. optical touch screen control circuit as claimed in claim 1, is characterized in that, described detection module comprises the second triode, the 3rd triode, the second resistance and the 3rd resistance; Wherein said the second triode is NPN triode, and its collector is connected with the positive output end of described photoinduction module, and base stage is connected with described control chip, and emitter is by the second resistance eutral grounding; Described the 3rd triode is NPN triode, and its collector is connected with preset positive source, and base stage is connected with the emitter of described the second triode, and emitter is connected, also passes through the 3rd resistance eutral grounding with the test side of described control chip.

5. optical touch screen control circuit as claimed in claim 1, is characterized in that, optical touch screen control circuit also comprises the first electric capacity, and one end of described the first electric capacity is connected with the input end of described modular converter, other end ground connection.

6. optical touch screen control circuit as claimed in claim 1, is characterized in that, described modular converter is DC boosting chip.

7. an optical touch screen control device, is characterized in that, comprises optical touch screen and the optical touch screen control circuit as described in any one in claim 1 to 6.

8. optical touch screen control device as claimed in claim 7, is characterized in that, described optical touch screen comprises backlight, display panels and some photoinduction modules, and wherein said photoinduction module is between described backlight and described display panels.

9. an optical touch screen control system, is characterized in that, comprises optical touch screen control device as claimed in claim 7.

10. optical touch screen control system as claimed in claim 9, is characterized in that, described optical touch screen comprises backlight, display panels and some photoinduction modules, and wherein said photoinduction module is between described backlight and described display panels.

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