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Liquid crystal display with touch keys

A liquid crystal display, touch key technology, applied in static indicators, instruments, electrical digital data processing and other directions, can solve the problems of small touch sensing area, insensitive touch button operation, etc., to meet market demand, the effect of fashionable and novel structure

Inactive Publication Date: 2009-11-11
NANJING LG TONGCHUANG COLOR DISPLAYS SYST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of this touch method is: the touch sensing area is small, and a sponge pad is generally added under the sensing metal plate to increase the touch sensing area; and the touch sensing area is small, which may easily lead to insensitive touch buttons

Method used

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  • Liquid crystal display with touch keys
  • Liquid crystal display with touch keys

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Embodiment Construction

[0017] A touch-key liquid crystal display according to the present invention, the display includes a metal plate 1 of a control board, a low-pass filter 2 , a counter 3 , a data processor 4 , a main chip 5 and a capacitor 6 . The input end of the low-pass filter 2 is connected with the control board metal plate 1, the output end of the low-pass filter 2 is connected with the counter 3; the input end of the data processor 4 is connected with the output end of the counter 3, and the output end of the data processor 4 The terminal is connected with the main chip 5; the capacitor 6 is arranged between the output terminal of the metal disk 1 of the control board and the input terminal of the low-pass filter 2.

[0018] During operation, after the human body touches the metal plate 1 of the control board, since the human body itself is a charged body, it will discharge through the metal plate, generate current IDAC, and charge the capacitor 6 to generate a Vcomd voltage value, and pa...

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Abstract

The invention discloses a liquid crystal display with touch keys, which comprises a control panel metal disc, a low pass filter, a counter, a data processor, a main chip and a capacitor; the input end of the low pass filter is connected with the control panel metal disc; the output end of the low pass filter is connected with the counter; the input end of the data processor is connected with the output end of the counter, while the output end is connected with the main chip; the capacitor is arranged between the output end of the control panel metal disc and the input end of the low pass filter; current generated by the control panel metal disc charges the capacitor, and stable voltage signals are transmitted to the counter through the low pass filter to obtain the charging time; and the data processor determines the range of voltage values according to the charging time and sends continuous signals to the main chip, and the main chip processes the continuous signals to obtain a working state. The liquid crystal display utilizes static induction touch keys, can have control function in the condition of not contacting, has fashionable and novel structure, and can meet the market requirement.

Description

technical field [0001] The invention relates to a liquid crystal display, in particular to a touch key liquid crystal display. Background technique [0002] At present, in the existing liquid crystal (LCD) display, the touch method is to press the metal plate of the button with the finger, and use the touch chip to cause the change of the input capacitance C602 through the touch of the human finger, and compare the input capacitance with the reference capacitance built in the chip to output The differential signal is amplified by the amplifier circuit, and the high and low levels are obtained at the output terminal to Key0, and sent to the main chip for display control action, which can realize the control of the analog signal. figure 1 It is a schematic circuit diagram of pressing a button metal plate with a finger in the prior art. The disadvantage of this touch method is: the touch sensing area is small, and a sponge pad is generally added under the sensing metal plate t...

Claims

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Application Information

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IPC IPC(8): G02F1/133G06F3/044H03K17/96
Inventor 李经
Owner NANJING LG TONGCHUANG COLOR DISPLAYS SYST CO LTD
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