Liquid crystal display driving device with interface conversion function

Abstract

The invention discloses a liquid crystal display driving device with an interface conversion function, which can receive an input selection signal and an image input signal to drive a liquid crystal panel, wherein the image input signal is a TTL interface input signal or an LVDS interface input signal. The driving device has a bus switching input unit, an encoder unit and a transceiver unit, wherein the bus switching input unit can be controlled by the input selection signal to selectively receive the TTL interface input signal or the LVDS interface input signal; the encoder unit is electrically connected to the bus switching input unit and can be controlled by the input selection unit to selectively re-encode the TTL interface input signal or the LVDS interface input signal into an LVDS interface signal or a TTL interface signal; and the transceiver unit is electrically connected to the encoder unit to transmit the output of the encoder unit to a source drive circuit so as to reduce the size of a required flexible circuit board and to fulfill a design goal of sharing by various machine types at the same time to effectively reduce cost waste .

Description

technical field [0001] The invention relates to a liquid crystal display driving device, in particular to a liquid crystal display driving device with an interface conversion function. Background technique [0002] Thin-film transistor liquid crystal display (TFT-LCD) mainly uses thin-film transistors to switch liquid crystal light valves arranged in arrays, and then cooperates with color filter layers to provide filtering effects to achieve full-color display of images. The driving system of TFT-LCD mainly includes gate driver (Gate Driver) chip, source driver (Source Driver) chip, and timing controller (TCON or T-CON, TimingController) chip to transfer power, control and image data The signal is sent to a thin film transistor switch on the glass plate. [0003] Furthermore, in order to receive external image signals, the driving system of the liquid crystal display needs to have an analog interface circuit or a digital interface circuit to connect with an external signal ...

AI Technical Summary

Problems solved by technology

Most of the signal connection lines 14 on the flexible circuit board 2 are segmented and define the same signal and DC voltage, so a considerable amount of flexible circuit board material is wasted

[0006] Furthermore, the source driver 12 is designed to only support a single image communication interface in consideration of cost. Therefore, when the terminal signal is different from the image communication interface provided by the source driver 12, in order to enable the TFT-LCD drive system to To receive TTL interface input signals or differential signals (such as LVDS interface input signals), the design must design flexible circuit boards for different interfaces. If the corresponding source driver 12 only accepts TTL signals and the terminal is LVDS, then it is To add an interface conversion circuit from LVDS to TTL in the design, on the contrary, it is necessary to have a conversion circuit from TTL to LVDS interface. Therefore, the design of flexible circuit board 2 will be different for different models according to different video interface designs. However, the connectors of the video interface connection terminals are different, so it will cause waste of development costs and difficulties in material preparation, and even cause problems such as idle materials.

Images