CN201359717Y

CN201359717Y - Technology for realizing control on touch screen by recording circuit

Info

Publication number: CN201359717Y
Application number: CNU2008200959013U
Authority: CN
Inventors: 曾声正; 黄善兵; 陈增灼
Original assignee: SHENZHEN HWAPU ELECTRONIC TECHNOLOGY Co Ltd
Current assignee: Shenzhen Huapu Electronic Technology Co., Ltd.
Priority date: 2008-07-25
Filing date: 2008-07-25
Publication date: 2009-12-09
Anticipated expiration: 2018-07-25

Abstract

The utility model discloses a technology for realizing the control on a touch screen by a recording circuit. The technical product comprises a touch screen X substrate (1), a Y substrate (2), a recording circuit control chip AD (3), a control circuit and an analog switch. The recording circuit AD is applied to respectively sample touch screen signals and recording signals. The analog switch is controlled to rapidly conduct the switch among different channels of the touch screen, simulate alternating current signals, realize the acquisition of data of the X axle and Y axle of direct current voltage and determine the position of clicking the touch screen through data calculation, thus achieving the purpose of sampling direct current signals by an alternating current recording circuit AD and the function of the control on the touch screen. Simultaneously, a control chip specially used for a high-precision touch screen is saved, which does not limit the recording function of the system on the one hand, but reduces the system cost and increases the system reliability on the other hand.

Description

Recording circuit is realized the touch-screen control device

[technical field]

The utility model relates to a kind of recording circuit of using and realizes the touch-screen control device on learning machine and electronic dictionary.

[background technology]

Along with development of times, new technology constantly is applied to the consumer product field, and functions such as handwriting input/identification, audio frequency, video are come in the consumer product.Along with the cut-throat competition of consumer industry, can the cost determination product of the performance of product and product base oneself upon on market and develop.In having the electronic product of touch-screen, if the master control controller of this product development does not have high-precision control IC chip (being called for short AD), perhaps the resolution of AD is not high, in order to improve the effect of handwriting recognition, can only increase a high-precision AD (control IC chip) in the periphery, improve cost greatly.

At present, all integrated recording of common on the market audio frequency apparatus and player function, and all has a stereosonic function, two playback passages just, two recording channels must be high resolving power control IC owing to implement the AD of sound-recording function, if so can utilize the AD of recording, realize the signals collecting of touch-screen, this will reduce the cost of product greatly, make product occupy greater advantage on cost.

[utility model content]

The utility model relates to a kind of recording circuit and realizes the touch-screen control device, is applicable to simultaneously with audio frequency and hand-written consumer product field.It comprises touch-screen X substrate (1), Y substrate (2), recording circuit AD (3) and control circuit and analog switch, by the signal that provides a kind of control IC to sample touch-screen with recording, do not carry the AD module for master controller, the low product of touch screen signal sampling of can't realizing of the resolution that perhaps carries the AD module especially is fit to use present technique.It utilizes the high-resolution control IC sampling module of recording, the sample signal of touch-screen of a passage, another channel sample recorded audio signals, the sound-recording function of system without limits so not only, but also reduced the cost of system and increased the reliability of system.

A kind of recording circuit of the utility model is realized the touch-screen control device, be Huapu Electronic Technology Co., Ltd., Shenzhen City through the technology of many autonomous research and development half a year, broken and traditionally controlled the sample situation of touch screen signal of IC chip with the peripheral expansion special high-accuracy.It is mainly by high-resolution recording control IC sampling module sample respectively touch-screen and recorded audio signals, by the control analog switch, intend AC signal to switching between the different passages of touch-screen fast, and the DC voltage X-axis of gathering and the data difference of Y-axis determined the position that touch-screen is clicked, reach to finish and exchange the sample purpose of touch-screen contact position direct current signal of recording AD chip.

[description of drawings]

Fig. 1 forms structural map for the utility model

Fig. 2 is the utility model logical circuitry

As shown in the figure:

1---electrically-conductive backing plate X-axis screen on the touch-screen comprises two DC voltage X+, X-;

2---electrically-conductive backing plate Y-axis screen under the touch-screen comprises two DC voltage Y+, Y-;

3---recording circuit AD;

4---the recording circuit module;

5---INT down trigger module.

Wherein SW1, SW2, SW3, SW4 are switchable simulation gauge tap, and R represents resistance.

[embodiment]

(1) principle of touch-screen:

Touch-screen is attached to the surface of display, the use that matches with display, if energy measurement goes out the coordinate position of touch point on screen, and the intention that can know the toucher according to the displaying contents or the icon of respective coordinates point on the display screen then.With the four-wire ohm touch-screen is example, electric resistance touch screen is one 4 layers a transparent laminated film screen, as shown in Figure 1, the bottom is the basic unit that glass or organic glass constitute, topmost be thereby that one deck outside surface is through the smooth scratch resistant plastic layer of cure process, the centre is the double layer of metal conductive layer, on basic unit and the plastic layer inside surface, has many tiny transparent isolating points that they are separated between two conductive layers respectively.When the finger touch screen, two conductive layers are in the contact of place, touch point.

Two metal conducting layers of touch-screen are two workplaces of touch-screen, respectively scribble an elargol at the two ends of each workplace, the pair of electrodes that is called this workplace if apply voltage on the electrode pair of a workplace, then will form evenly continuous parallel voltage and distribute on this workplace.As shown in Figure 1, on electrode pair, apply a voltage of determining at directions X, and on the Y direction electrode pair not during making alive, in the parallel voltage field of X, the magnitude of voltage at place, contact can reflect on Y+ (or Y-) electrode, by measuring Y+ electrode voltage swing over the ground, just can learn the X coordinate figure of contact.In like manner, when making alive on the Y electrode pair, and on the X electrode pair not during making alive,, just can learn the Y coordinate of contact by the voltage of measured X+electrode.

(2) sampling of the utility model touch screen signal

1. the AD of recorded audio signals sampling, sampling be the signal that exchanges, so chip internal has the logical wave filter that exchanges the resistance direct current.

2. touch screen signal is by four X that DC voltage is formed in electrically-conductive backing plate X-axis screen (1) and the electrically-conductive backing plate Y-axis screen (2), X-, Y, Y-forms, how to allow AD (3) sampling A of an interchange go the to sample signal of some direct currents become key: by the control analog switch, come the analog AC signal to switching between the different passages of touch-screen fast, reach and finish the purpose that exchanges AD chip sampling direct current signal.

(3) concrete implementation step

1. when touch-screen is handled idle condition (not having a some incident), SW1 is switched to X+, SW2 switches to Y-, and SW3 is switched to Y-, simultaneously SW4 is disconnected, and waits for a some incident;

2. when touch-screen had the pen point, the level on the INT line (5) had a saltus step from low to high by resistance R, triggered touch-screen and interrupted, and in the break in service function, with SW4 closure (the Do not touch screen interrupts), simultaneously SW3 was switched to X-; Beginning (3)---recording chip AD module samples.

3. by switching SW1 and SW2, X+, X-are powered up, switch to sampling X-passage, sampling X-data by SW3.

4. by switching SW1 and SW2, X+, X-are powered up, switch to sampling Y-passage, sampling X data by SW3.

5. by switching SW1 and SW2, Y+, Y-are powered up, switch to sampling X-passage, sampling Y data by SW3.

6. by switching SW1 and SW2, Y+, Y-are powered up, switch to sampling Y-passage, sampling Y-data by SW3.、

7. according to sampled data, calculate the position that touch-screen is clicked.

8. finish the data sampling that touch-screen one is taken turns, return to the touch-screen idle condition of acquiescence, wait for a some incident of next round.

Like this, just finished the process of carrying out touch screen signal sampling by recorded audio signals AD sampling module, broken traditionally, reduced the cost of system and the reliability of increase system with the sample situation of touch screen signal of peripheral expansion AD sampling A.

Claims

1, a kind of recording circuit is realized the touch-screen control device, it is characterized in that the utility model relates on learning machine and electronic dictionary adopts the recording circuit mode to realize touching technique, the utility model touch-screen control device is one 4 layers a transparent laminated film screen, comprises touch-screen X substrate (1), Y substrate (2), recording circuit AD (3), recording circuit module (4), INT down trigger module (5) and control circuit and analog switch; In the middle of substrate (1) and the substrate (2) is the double layer of metal conductive layer, and these two metal conducting layers are two workplaces of touch-screen, respectively scribble an elargol at the two ends of each workplace.

2, a kind of recording circuit as claimed in claim 1 is realized the touch-screen control device, it is characterized in that described recording circuit AD (3) is high-resolution control IC, has omitted and substituted the special-purpose control of the touch-screen IC that is used to sample in the former touch screen technology.

3, a kind of recording circuit as claimed in claim 1 is realized the touch-screen control device, it is characterized in that described recording circuit AD control program writes fashionable two passages that are provided with, the sample signal of touch-screen of a passage, another channel sample recorded audio signals.