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Capacitive touch display module

A technology of capacitive touch and display modules, which is applied in the fields of electrical digital data processing, instruments, calculations, etc., can solve the problems of high module cost, unfavorable market promotion, and difficult expansion, and achieve good anti-misoperation and protection High performance, simple system structure, sensitive touch effect

Inactive Publication Date: 2018-05-11
NANJING UNIV OF SCI & TECH
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  • Abstract
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AI Technical Summary

Problems solved by technology

However, the traditional touch module design uses a resistive touch screen, which has disadvantages such as slow response and inconvenient operation; and a programmable logic device is often used as the core controller to generate the row and column drive signals of the LED dot matrix, resulting in the cost of the designed module High, difficult to expand, complicated interface circuits, etc., are not conducive to market promotion

Method used

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Embodiment Construction

[0023] Aiming at the capacitive touch screen, the present invention designs a capacitive touch display module in combination with the system solidified control chip RA8876, and uses the center of gravity algorithm to locate the touch point of the touch screen. The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0024] figure 1 It is a block diagram of a capacitive touch display module, which includes a microprocessor, SDRAM memory, a capacitive screen controller, a capacitive screen, a backlight and a keyboard.

[0025] 1. Microprocessor

[0026] The full name of the MPU is an embedded microprocessor, which evolved from the CPU in a general-purpose computer. Different from computer processors, in the actual embedded application, only the functional hardware closely related to the embedded application is reserved, and other redundant functional parts are removed, so that the special features of the embedded applicat...

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Abstract

The invention discloses a capacitive touch display module. The module comprises a microprocessor (1), an SDRAM memory (2), a capacitive touch screen controller (3), capacitive touch screen (4), a backlight board (5) and a keyboard (6), wherein the microprocessor (1) is used for transmitting instruction to the capacitive touch screen controller (3) through a main control end interface; the SDRAM memory (2) is connected with the capacitive touch screen controller (3) and is used for accessing data; the capacitive touch screen controller (3) is connected with the capacitive touch screen (4) through a CMOS interface and is used for controlling the backlight board (5) to realize screen display by combining a PWM module; and a key module is arranged to support the keyboard (6). By adoption of the capacitive touch screen, the capacitive touch display module has favorable dynamic resistance and protectiveness; and by adopting an LCD controller RA8876 and combining a gravity center algorithm toposition touch points, the whole touch display module has the advantages of being rapid in screen updating, correct in positioning, strong in operability and power-saving.

Description

technical field [0001] The invention relates to the technical field of touch screens, in particular to a capacitive touch display module. Background technique [0002] In today's highly developed society, the transmission of information is a very important link in people's lives. In order to obtain and release information more conveniently, LED electronic display screens have entered our field of vision. Compared with previous display devices, LED display is more miniaturized, has higher brightness, and is more convenient to expand. Moreover, its operating voltage is low, power consumption is small, and its life is long, which greatly reduces installation costs. Therefore, it is widely used in various fields. On the basis of LED, due to the development of smart phones and smart computers, LED touch screen with touch function is becoming a technological trend and entering people's lives. [0003] Since current touch panels include resistive, capacitive, and optical technolo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F3/041G06F3/044
CPCG06F3/0412G06F3/044
Inventor 徐忠文周漪莲刘屹东王俊刘瑶秋
Owner NANJING UNIV OF SCI & TECH
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