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Pre-emphasis circuit

A pre-calibration and circuit technology, applied in static indicators, instruments, etc., can solve the problems of increased cost of driver IC, high complexity of control circuit of driver IC, unfavorable market competitiveness, etc., so as to improve market competitiveness and avoid Increase in circuit complexity and production cost, improving the effect of insufficient driving capability

Inactive Publication Date: 2017-04-05
RAYDIUM SEMICON
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, if Figure 1B As shown, in addition to the switches SW1-SW3, the traditional pre-calibration circuit of the driver IC used in the liquid crystal display panel usually needs to be provided with a plurality of capacitors C1 and C2, and in order to improve thermal noise (Thermal Noise) and flicker noise ( Flicker Noise), in addition to the capacitance of these capacitors C1 and C2 need to be large enough, such as Figure 1C As shown, the timing diagram for the opening or closing of the switches SW1-SW3 also becomes more complicated, which leads to a higher complexity of the control circuit of the driver IC, and greatly increases the cost of the driver IC of the liquid crystal display panel, which is not conducive to its Market Competitiveness

Method used

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Embodiment Construction

[0051] A preferred embodiment according to the present invention is a pre-calibration circuit. In this embodiment, the pre-correction circuit is applied to the liquid crystal display panel. When the load of the liquid crystal display panel is large or the time for charging the liquid crystal display panel is insufficient, the pre-correction circuit can strengthen its source driver in the remote The ability to drive the liquid crystal and shorten the charging time for it to reach the target voltage enables the liquid crystal display panel to display pictures normally, but not limited thereto.

[0052] Generally speaking, the main function of the source driver of the liquid crystal display panel is to convert the serial digital signal provided by the system board into a parallel signal, and then output the control liquid crystal after conversion by the digital / analog conversion circuit (Digital to Analog Converter, DAC). Operate the analog voltage to the data line of the LCD pan...

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Abstract

A pre-emphasis circuit applied to a LCD panel is disclosed. The pre-emphasis circuit includes a digital-to-analog converting unit and a pre-emphasis control unit. The digital-to-analog converting unit includes a pre-emphasis switch. The digital-to-analog converting unit receives a data signal and a power reference level signal respectively and outputs an output signal. The pre-emphasis control unit is coupled to the digital-to-analog converting unit and used to selectively switch on or off the pre-emphasis switch to start or stop a pre-emphasis function performed on the output signal according to whether a grey-level code of the data signal is changed.

Description

technical field [0001] The invention relates to liquid crystal display panels, in particular to a pre-correction circuit applied to liquid crystal display panels. Background technique [0002] With the continuous development of liquid crystal display technology, various display devices and electronic devices using high-resolution and large-size liquid crystal display panels have become quite popular. However, since the resolution of the LCD panel is getting higher and the size of the panel is getting bigger and bigger, the load on the LCD panel will be more and more technically, and the time for the driver IC to charge the LCD panel will also be longer. shorter and shorter. Therefore, if Figure 1A The driving IC of the traditional LCD panel shown will not be able to charge the liquid crystal at the remote end enough, so it is necessary to add Figure 1B The shown pre-emphasis circuit (Pre-emphasis Circuit) is used to increase the charging amount of the driver IC to the li...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G09G3/36
CPCG09G3/3688G09G2310/0251G09G2310/0291G09G2320/0276G09G3/36
Inventor 林柏成林余俊
Owner RAYDIUM SEMICON
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