CN206805498U

CN206805498U - A kind of hand-written LCDs writing erasing circuit

Info

Publication number: CN206805498U
Application number: CN201720421442.2U
Authority: CN
Inventors: 黄华杰
Original assignee: Shenzhen Screen Technology Co Ltd
Current assignee: Shenzhen Screen Technology Co Ltd
Priority date: 2017-04-21
Filing date: 2017-04-21
Publication date: 2017-12-26
Anticipated expiration: 2027-04-21

Abstract

The utility model discloses a kind of hand-written LCDs writing erasing circuit, the writing erasing circuit is arranged in drive circuit, the input connection booster circuit of the drive circuit, MCU governor circuits, its output end is electrically connected with liquid crystal display, the power input connection button cell of the MCU governor circuits, its control terminal input circuit attended operation button, the hand-written LCDs writing erasing circuit of the utility model is to be improved driving voltage to more than 25V by adjustable resistance, writing is removed clean, writing erasing circuit of the present utility model is stable, it is not in slow phenomenon, quickly writing can be wiped.

Description

A kind of hand-written LCDs writing erasing circuit

Technical field

Display screen technology field is the utility model is related to, particularly relates to a kind of hand-written LCDs writing erasing Circuit.

Background technology

With developing rapidly for image display technology, education, business meetings or training field pass through frequently with electronic whiteboard, thrown The instruments such as shadow display image on wall, not only show that person clear but also easy to operation neatly realizes page turning, mark as needed The functions such as knowledge, editor and animation, have very strong visual performance effect.

Hand-writing liquid crystal screen is a kind of new writable flexible liquid crystal display, mainly integrates hand drawing board and display , it pressure sensi-tive pen can be used directly painted on LCD screen, be hand-written, feel close due to Freehandhand-drawing and painted in common paper Draw, more more directly perceived than traditional Digitizing plate input, efficient, therefore, liquid crystal numerical digit screen should in industries such as animation drawing, writing signings With more and more wide, including such as government, bank, communication, finance, medical treatment, animation video display, Architectural Graphing, design are published.Pressure Sense pen is the image marking tools for coordinating hand-writing liquid crystal screen to use, and this electronic pen can not only write out as handwriting pad Word, and nib has pressure sensitive, the size that can be exerted oneself according to you, imitates out the image write and drawn with different pressures.

The erasing of hand-writing liquid crystal screen writing is realized by circuit, and traditional writing erasing circuit is the output by power supply Terminal voltage regulation wipes effect to solve writing, and traditional writing erasing is it sometimes appear that erasing is unhappy, and reaction is unstable etc. Phenomenon.

Utility model content

For deficiency of the prior art, the technical problems to be solved in the utility model is the provision of a kind of hand-written liquid crystal Display screen writing erasing circuit.

In order to solve the above technical problems, the utility model is realized by following scheme：A kind of hand-written LCDs word Mark erasing circuit, the writing erasing circuit are arranged in drive circuit, the input connection booster circuit of the drive circuit, MCU governor circuits, its output end are electrically connected with liquid crystal display, and the power input of the MCU governor circuits connects button cell, its Control terminal input circuit attended operation button, voltage-stablizer U is electrically connected with the writing erasing circuit, and the voltage-stablizer U is provided with Five pins, its 1# pin electrical connection inductor L1, diode D4 positive pole, electric capacity C2, the diode D4 other end electricity Connection adjustable resistance R2 resistance adjustment end, electric capacity C5, electric capacity C4, electric capacity C5 electrical connection voltage-stablizer U 3 pins, it is described adjustable Resistance R2 other end electrical connection voltage-regulator diode D3, crystal resonator Y1, the crystal resonator Y1 other end and voltage-regulator diode D3 The other end, the electric capacity C4 other end, electric capacity C6 connections, the other end of the electric capacity C6 are electrically connected with the inductor L1 other end, And in electric capacity C6 with being connected resistance R4, voltage-stablizer U 5 pins, the other end of the resistance R4 on inductor L1 circuit node Voltage-stablizer U 4 pins are connected, the other end of the electric capacity C2 is electrically connected with diode D2 negative pole, diode D1 positive pole, institute State diode D2 positive terminal electric connection resistance R3, resistance R3 other end connection voltage-stablizer U 2 pins and be grounded, described two Pole pipe D1 other end connection electric capacity C1, resistance R1, NPN type triode Q1 colelctor electrode, the other end ground connection of the electric capacity C1, The resistance R1 other end is connected with electric capacity C1 earth terminal, is electrically connected with NPN type triode Q1 base stage, the pole of NPN type three Pipe Q1 emitter stage connection vgh voltage input ends.

Relative to prior art, the beneficial effects of the utility model are：The hand-written LCDs writing of the utility model is wiped Except circuit is to improve driving voltage to more than 25V by adjustable resistance, writing is removed to clean, writing wiping of the present utility model Except circuit is stable, is not in slow phenomenon, quickly can wipe writing.

Brief description of the drawings

Fig. 1 is the utility model writing erasing circuit theory diagram；

Fig. 2 is the utility model writing erasing circuit figure.

Embodiment

Preferred embodiment of the present utility model is described in detail below in conjunction with the accompanying drawings, so that the advantages of the utility model It can be easier to be readily appreciated by one skilled in the art with feature, it is apparent clear and definite so as to be made to the scope of protection of the utility model Define.

It refer to accompanying drawing 1-2, a kind of hand-written LCDs writing erasing circuit of the present utility model, writing erasing electricity Road（21）It is arranged at drive circuit（2）In, the drive circuit（2）Input connection booster circuit, MCU governor circuits（1）, Its output end is electrically connected with liquid crystal display, the MCU governor circuits（1）Power input connection button cell, its control terminal is defeated Enter circuit attended operation button, the writing erasing circuit（21）In be electrically connected with voltage-stablizer U, the voltage-stablizer U is provided with five Pin, its 1# pin electrical connection inductor L1, diode D4 positive pole, electric capacity C2, the diode D4 other end electrical connection Adjustable resistance R2 resistance adjustment end, electric capacity C5, electric capacity C4, electric capacity C5 electrical connection voltage-stablizers U 3 pins, the adjustable resistance R2 other end electrical connection voltage-regulator diode D3, crystal resonator Y1, the crystal resonator Y1 other end and voltage-regulator diode D3 is another End, the electric capacity C4 other end, electric capacity C6 connections, the other end electric connection inductor L1 of the electric capacity C6 other end, and Electric capacity C6 is with being connected resistance R4, voltage-stablizer U 5 pins, the other end connection of the resistance R4 on inductor L1 circuit node Voltage-stablizer U 4 pins, the other end electric connection diode D2 of the electric capacity C2 negative pole, diode D1 positive pole, described two Pole pipe D2 positive terminal electric connection resistance R3, resistance R3 other end connection voltage-stablizer U 2 pins are simultaneously grounded, the diode D1 other end connection electric capacity C1, resistance R1, NPN type triode Q1 colelctor electrode, the other end ground connection of the electric capacity C1, resistance The R1 other end is connected with electric capacity C1 earth terminal, is electrically connected with NPN type triode Q1 base stage, the NPN type triode Q1 Emitter stage connection vgh voltage input ends.The hand-written LCDs writing erasing circuit of the utility model is to pass through adjustable resistance Driving voltage is reduced to below 25V by R2, writing is removed totally, writing erasing circuit of the present utility model is stable, no Slow phenomenon occurs, quickly can wipe writing.

Preferred embodiment of the present utility model is the foregoing is only, not thereby limits patent model of the present utility model Enclose, every equivalent structure made using the utility model specification and accompanying drawing content or equivalent flow conversion, or directly or Connect and be used in other related technical fields, be similarly included in scope of patent protection of the present utility model.

Claims

1. a kind of hand-written LCDs writing erasing circuit, the writing erasing circuit（21）It is arranged at drive circuit（2）In, institute State drive circuit（2）Input connection booster circuit, MCU governor circuits（1）, its output end is electrically connected with liquid crystal display, described MCU governor circuits（1）Power input connection button cell, its control terminal input circuit attended operation button, its feature exists In：The writing erasing circuit（21）In be electrically connected with voltage-stablizer U, the voltage-stablizer U and be provided with five pins, its 1# pin is electrically connected Connect the resistance tune that inductor L1, diode D4 positive pole, electric capacity C2, the diode D4 other end electrically connect adjustable resistance R2 End, electric capacity C5, electric capacity C4, electric capacity C5 electrical connection voltage-stablizer U 3 pins are saved, the other end electrical connection of the adjustable resistance R2 is steady Press diode D3, crystal resonator Y1, the crystal resonator Y1 other end and the voltage-regulator diode D3 other ends, electric capacity C4 the other end, Electric capacity C6 connections, the other end of the electric capacity C6 are electrically connected with the inductor L1 other end, and electric capacity C6's and inductor L1 Resistance R4, voltage-stablizer U 5 pins are connected on circuit node, the other end of the resistance R4 connects voltage-stablizer U 4 pins, described The electric capacity C2 other end is electrically connected with diode D2 negative pole, diode D1 positive pole, and the positive terminal of the diode D2 is electrically connected Connecting resistance R3, resistance R3 other end connection voltage-stablizer U 2 pins are simultaneously grounded, the other end connection electric capacity of the diode D1 C1, resistance R1, NPN type triode Q1 colelctor electrode, the other end ground connection of the electric capacity C1, resistance the R1 other end and electric capacity C1 Earth terminal connection, electrically connect with NPN type triode Q1 base stage, the emitter stage of the NPN type triode Q1 connects vgh voltages Input.