CN214375931U

CN214375931U - LCD built-in touch detection device

Info

Publication number: CN214375931U
Application number: CN202120420101.XU
Authority: CN
Inventors: 尹泽轩; 蔡叻
Original assignee: Zhuzhou Jingcai Electronics Technology Co ltd
Current assignee: Zhuzhou Jingcai Electronics Technology Co ltd
Priority date: 2021-02-26
Filing date: 2021-02-26
Publication date: 2021-10-08
Anticipated expiration: 2031-02-26

Abstract

The utility model discloses a built-in touch detection device of LCD, which comprises a power supply unit, a touch unit, a processing unit and an alarm unit; the touch unit adopts a touch chip, the input end of the touch unit is externally connected with a built-in LCD, and the output end of the touch unit is connected with the processing unit; the processing unit adopts a single chip microcomputer, and the single chip microcomputer receives a touch signal of the touch chip and drives the alarm unit to make a sound to prompt the occurrence of a touch action; the power supply unit provides electric energy for the touch chip and the single chip microcomputer. The device can effectively detect the touch function of the LCD built-in touch product, and avoids the circulation of products with abnormal touch function; the operation is simple and convenient; the device has small volume and is convenient to carry and transfer; the method is suitable for detecting the built-in touch products of the LCD with different touch points.

Description

LCD built-in touch detection device

Technical Field

The utility model relates to a LCD tests technical field, more specifically relates to a built-in touch detection device of LCD.

Background

The LCD is a common display screen, is one of the display screens widely used in the display industry at present, and has the characteristics of good display effect, simple structure, low energy consumption, high brightness, wide temperature range and the like. LCD liquid crystal display screens are adopted as display terminals in many industries.

The touch screen is always in an external hanging type since the invention is invented, namely, the independent touch screen is attached to the LCD for use, but the thickness of the product is thicker (the thickness of the LCD and the touch screen) due to the structure, which is contrary to the mainstream ultrathin product. Therefore, the touch screen and the LCD are integrated into a whole, namely the touch screen and the LCD are made into a built-in type, so that the requirement of ultra-thinness is met (the total thickness is only the original thickness of the LCD).

Although the black-and-white LCD industry makes built-in touch products, most manufacturers do not detect the touch detection function and have no related detection device, but leave the problem of the touch detection function in the hands of customers, so that the customers can use their own main boards to detect the functions after assembling finished products. This leads to a risk that the LCD product in which the touch failure or abnormality occurs cannot be detected in time and circulated to the customer's hand.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model is to the aforesaid not enough, a built-in touch detection device of LCD is provided. The detection device can effectively detect the touch function of the LCD built-in touch product, is simple and convenient to operate, has a small volume, does not need an additional host, can detect whether the touch function of the product is abnormal or not before the LCD built-in touch product leaves a factory, and effectively avoids the circulation of the LCD built-in touch product with poor touch.

The utility model discloses a following scheme can realize:

the LCD built-in touch detection device comprises a power supply unit, a touch unit, a processing unit and an alarm unit; the touch unit adopts a touch chip, the input end of the touch unit is externally connected with a built-in LCD, and the output end of the touch unit is connected with the processing unit; the processing unit adopts a single chip microcomputer, and the single chip microcomputer receives a touch signal of the touch chip and drives the alarm unit to make a sound to prompt the occurrence of a touch action; the power supply unit provides electric energy for the touch chip and the single chip microcomputer. In the scheme, the touch chip is used for collecting low-level touch signals of an LCD built-in touch product and transmitting the touch signals to the single chip microcomputer, and the single chip microcomputer controls the alarm unit to make a sound after collecting the touch signals so as to indicate that the touch function of the product is normal.

Further, the touch chip adopts a model WTC 6212.

Further, the alarm unit adopts a buzzer.

Furthermore, the touch chip is connected with built-in LCDs of different models through the switching PCB. In the scheme, the built-in LCDs with different types and different touch points can be detected by connecting the switching PCBs with different pin numbers of different products. And extra equipment and software are not needed, and each product can be realized by only using a special switching PCB.

Compared with the prior art, the utility model following beneficial effect has:

(1) the detection device can solve the problem of the quality of products with built-in touch of the LCD, and products with abnormal touch function can not be left to be transferred to the next place.

(2) The operation is simple and convenient: when other functions of the LCD are tested in the original production flow, the touch area is clicked by a finger, and if a product which gives out sound exists, the touch function is normal; if no sound is emitted or sometimes not emitted, it represents an abnormality in the touch function. For operators, the operation is very simple and convenient, and no additional detection burden is increased.

(3) The product does not need additional equipment and software, has small volume, is convenient to carry and transfer, can be operated by a single person, and does not produce pollution such as waste gas, waste water and noise.

(4) The applicability is wide: the method can be suitable for detecting built-in LCD products with different types and different touch points.

Drawings

Fig. 1 is a schematic diagram of a touch detection device built in an LCD according to embodiment 1.

Fig. 2 is a schematic view of an external structure of the built-in LCD.

Fig. 3 is a diagram of the utility model discloses a test object of the built-in touch detection device of LCD.

Detailed Description

The following specific examples further illustrate the present invention in detail. Unless otherwise indicated, the various starting materials used in the examples of the present invention may be obtained from conventional commercial sources or prepared according to conventional methods in the art, and the equipment used is equipment commonly used in experiments. Unless defined or stated otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.

Example 1

The embodiment provides an LCD built-in touch detection device, which comprises a power supply unit, a touch unit, a processing unit and an alarm unit; the touch unit adopts a touch chip, the input end of the touch unit is externally connected with a built-in LCD, and the output end of the touch unit is connected with the processing unit; the processing unit adopts a singlechip which receives the touch signal of the touch chip and drives the alarm unit to make a sound to prompt the occurrence of the touch action.

The power supply unit of this embodiment provides steady voltage electric energy for touch chip and singlechip. The power supply unit comprises a capacitor and a three-terminal regulator which are connected in parallel. The capacitor comprises a first capacitor, a second capacitor, a third capacitor and a fourth capacitor.

The embodiment is provided with the switching PCB, and the switching PCB can be provided with different pin numbers for realizing the connection of the touch chip and a product to be tested.

As shown in fig. 1, the touch chip is of a model WTC 6212. The input end of the test board is connected with the key and the resistor and is connected with an LCD built-in touch product to be tested through a switching PCB. This embodiment has adopted 12 groups button and resistance, and the switching PCB board of the maximum 12 touch points of matching pin quantity. When detection is carried out, the number of the detected touch points is set through on-off of the keys. The detection device of the embodiment can detect the built-in touch products of the LCD with touch points within 12. It is understood that in order to meet the requirements of different touch point products, PCBs with different pin counts may be used for conversion.

In this embodiment, the alarm unit employs a buzzer. The output port of the singlechip is connected with the buzzer through the amplifier.

The working principle is as follows:

fig. 2 is a schematic plane structure diagram of an LCD built-in touch product. When a finger clicks and touches the pattern of the built-in touch product of the LCD, a human body can absorb weak current from the touch surface, and a low-level signal appears on a circuit connected with the touch position. The touch chip sends a pulse signal to the single chip microcomputer after detecting the low level of the corresponding touch pin, and the single chip microcomputer sends a level to the buzzer after receiving the signal and detecting the BCD code on the DATA line and carrying out program calculation processing, so that the buzzer makes a sound to represent that touch action occurs.

In practical application, the switching PCB and other detection components in the detection device can be manufactured into two parts,

after the program is compiled and burned into the singlechip, the detection can be carried out. It can be understood that the type of the single chip microcomputer can be selected according to the actual type, and the touch sensitivity can be adjusted by combining a program with the capacitance value. The program can be implemented autonomously by those skilled in the art according to the functional description, and is not described in detail here.

As shown in fig. 3, as an embodiment, the left part of the drawing is an actual drawing of the LCD built-in touch product, the middle part is an actual drawing of the adapting PCB, and the right part is other detection components of the touch detection device except the adapting PCB. The detection flow of this embodiment is as follows:

firstly, connecting a detected built-in touch product, a switching PCB and other detection parts of the touch detection device; and then, the touch pattern is pointed by a hand, the product with the sound is a qualified product, and the product without the sound at all is a unqualified product.

The detection flow is very simple and convenient, the detection device is applied to a production field, the use effect is good, and the detection device has practical value of wide application.

The positional relationships depicted in the drawings are for illustrative purposes only and are not to be construed as limiting the present patent. It is obvious that the above embodiments of the present invention are only examples for clearly illustrating the present invention, and are not limitations to the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. An LCD built-in touch detection device is characterized by comprising a power supply unit, a touch unit, a processing unit and an alarm unit; the touch unit adopts a touch chip, the input end of the touch unit is externally connected with a built-in LCD, and the output end of the touch unit is connected with the processing unit; the processing unit adopts a single chip microcomputer, and the single chip microcomputer receives a touch signal of the touch chip and drives the alarm unit to make a sound to prompt the occurrence of a touch action; the power supply unit provides electric energy for the touch chip and the single chip microcomputer.

2. The LCD built-in touch detection device according to claim 1, wherein the touch chip is of type WTC 6212.

3. The LCD built-in touch detection device according to claim 1, wherein the alarm unit employs a buzzer.

4. The LCD built-in touch detection device according to any one of claims 1 to 3, wherein the touch chip is connected with built-in LCDs of different models through an adapter PCB.