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VCOM voltage adjusting circuit with controllable range and method thereof

A voltage regulation circuit and range technology, used in instruments, static indicators, etc., can solve the problems of large VCOM adjustable range, low accuracy, slow efficiency, etc., and achieve the effect of controllable adjustment range and improved adjustment accuracy.

Active Publication Date: 2017-12-12
HUIZHOU DESAY SV AUTOMOTIVE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] 1. Slow efficiency; 2. Low precision; 3. The adjustable range of VCOM is too large, and the liquid crystal may be damaged during the adjustment process

Method used

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  • VCOM voltage adjusting circuit with controllable range and method thereof
  • VCOM voltage adjusting circuit with controllable range and method thereof
  • VCOM voltage adjusting circuit with controllable range and method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A range-controllable VCOM voltage regulation circuit includes an operational amplifier unit IC1 , a positive input circuit 1 , a negative input circuit 2 and a feedback circuit 3 .

[0028] Wherein, the negative input circuit 2 is connected to the bottom input terminal of the operational amplifier unit IC1, receives the PWM signal source, and adjusts the maximum and minimum values ​​of the input voltage according to the duty cycle of the PWM signal source.

[0029] The positive input circuit 1 is connected to the positive input terminal of the operational amplifier unit IC1 to provide a reference voltage signal for the operational amplifier unit IC1, and the input terminal of the positive input circuit 1 is connected to the negative AVDD terminal. In this embodiment, AVDD refers to an analog voltage source.

[0030] The feedback circuit 3 is a negative feedback circuit 3, which cooperates with the negative input circuit 2 to adjust the specific values ​​of the maximum v...

Embodiment 2

[0043] This embodiment provides a VCOM voltage regulation method on the basis of Embodiment 1, specifically including:

[0044] S1. Determine the resistance value of the first resistor R1 for the maximum value Vmax and the minimum value Vmin of the VCOM voltage according to product requirements;

[0045] S2. Determine the resistance value of the second resistor R2 and the resistance value of the third resistor R3 according to the maximum voltage Vmax, the minimum voltage Vmin, and the resistance value of the first resistor R1;

[0046] S3. Determine the voltage value Ux of the positive input terminal of the operational amplifier circuit according to the resistance values ​​of the first resistor R1, the second resistor R2 and the third resistor R3, thereby completing the determination of the output voltage Uout. Usually, Ux can be determined when the ratio t of the third resistor R3 to the second resistor R2 is determined.

[0047] The following table shows the recommended val...

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PUM

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Abstract

The invention relates to a VCOM voltage adjusting circuit with a controllable range. The circuit comprises an operation amplifier unit IC1, a positive input circuit, a negative input circuit and a feedback circuit. The negative input circuit adjusts the biggest input voltage and the smallest input voltage by receiving a PWM signal source. The feedback circuit adjusts output voltage by combining the negative input circuit. The positive input circuit provides reference input voltage. The invention also provides a VCOM voltage adjusting method based on the VCOM voltage adjusting circuit. The method comprises steps of determining relations between elements according to the maximum Vmax and the minimum Vmin of the VCOM voltage; and finally obtaining the proper VCOM voltage through the adjustment. The beneficial effects are that 1, the adjustment precision of the VCOM voltage is improved; 2, efficiency is improved; and 3, the adjusting range is controllable and actual conditions are well met.

Description

technical field [0001] The invention relates to the field of display adjustment of vehicle-mounted display screens, in particular to a range-controllable VCOM voltage adjustment circuit and a method thereof. Background technique [0002] In the liquid crystal manufacturing process, since the liquid crystal cannot be completely purified, some mobile ions will inevitably remain. When displaying a static picture, if the voltage on the liquid crystal electrode remains unchanged, the ions will always accumulate in a certain direction due to the action of the electric field, and the problem of residual picture will occur for a long time, resulting in damage to the liquid crystal. Polarity inversion is used in the industry to solve this problem, that is, even if a static picture is displayed, the voltage on the liquid crystal electrodes will be inverted around a common voltage, which is VCOM. However, when the voltage value of the VCOM voltage is not suitable, it will cause uneven...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G09G3/36
CPCG09G3/3614G09G3/3696
Inventor 冯钦
Owner HUIZHOU DESAY SV AUTOMOTIVE
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