Method for reducing output image noise for thin film field effect transistor liquid crystal display

A technology of thin film field effect and liquid crystal display, applied in the field of reducing output image noise interference, thin film field effect transistor liquid crystal display to reduce output image noise, can solve the problem that noise is difficult to improve, to improve noise problem, reduce vibration, increase cost effect

CN102270443AInactive Publication Date: 2011-12-07NANJING CEC PANDA LCD TECH
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
Publication Date
2011-12-07
Estimated Expiration
Not applicable · inactive patent

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Abstract

A method for reducing output image noise for thin film field effect transistor liquid crystal displays, proposes a scheme to dynamically change the output force adjustment of the source drive device S-Driver, reduces the voltage fluctuation of C1, reduces the MLCC vibration of C1, and truly improves the noise problem . The present invention adopts a device that can detect the screen and a source driver device that can change the driving capability. The device for detecting the screen is attached to the inside of the TCON. It only needs to make a five-point judgment on a screen, and each point is 5X5 pixel size or above, used to judge whether the picture is a noise picture. The drive capability of the SD can be adjusted inside without increasing the cost, and there is no need to develop an additional SD device. The TCON detection screen can easily control the SD. We only need to connect the control output pin of TCON with the SD input pin LP1, LP2. The utility model has the advantages of simple structure, good noise regulation effect, convenience and effectiveness.
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Description

technical field

[0001] The invention relates to a TFT-LCD module and a driving circuit, especially a method for reducing output image noise interference, in particular to a method for reducing output image noise for a thin film field effect transistor liquid crystal display.

[0002] Background technique

[0003] At present, in the picture output process of the thin film field effect transistor liquid crystal display, when the output picture is a noise picture, it is usually necessary to reduce the driving voltage of the noise picture to reduce the noise, such as figure 2 As shown, it is the driving circuit during the image output process. In the process of driving ability adjustment, C1 generally adopts MLCC, and uses bile capacitors to reduce noise. The disadvantage is that bile capacitors are not resistant to negative pressure and increase the cost by about $0.5-1USD , increasing the component height. In addition, the improvement method of countermeasure noise also has ...

Examples

Embodiment 1

[0042] The present invention detects the input image image through the detection image device, that is, the pulse controller (TCON), and the TCON controls the LP1 & LP2 pins of the SD respectively according to the different image images, so as to reduce the drastic change of the Vout voltage caused by the instant liquid crystal voltage pumping.

[0043] There is a Boost circuit inside the panel Figure II As shown, the Vout voltage in the Boost circuit supplies the driving liquid crystal voltage. Generally speaking, C1 uses a multi-layer stacked ceramic capacitor (MLCC) as a voltage stabilizing capacitor. Due to the dynamic adjustment of the drive capability of the panel SD, the drastic fluctuation of the Vout voltage is reduced, and the vibration of the MLCC is also reduced, and the noise problem can be improved.

[0044] The SD drive capacity is divided into the following table, and the SD thrust is controlled by the two pins (LP1&LP2),

[0045] LP1 LP2 Analog...