LCD (liquid crystal display) data driven IC (integrated circuit) output compensation circuit and compensation method

Abstract

The invention relates to an LCD (liquid crystal display) data driven IC (integrated circuit) output compensation circuit and a compensation method. The circuit comprises a data driven IC, a plurality of first switching unit and a delay control unit. A plurality of output channels of the data driven IC are respectively connected with pixel electrodes on corresponding lines in a glass substrate through data lines and output charging signals to charge the pixel electrodes on the corresponding lines; each output channel is provided with one first switching unit for controlling the output channel on which the first switching unit is positioned according to delay control signals generated by the delay control unit and outputting the charging signals according to preset delayed time; and the delay control unit generates the corresponding delay control signals according to impedance values of the corresponding data lines so as to control to start the corresponding first switching unit according to the preset delayed time and ensure each pixel electrode to have equal charging time. The LCD data driven IC output compensation circuit does not need to be wound with a wire; the routing space of the glass substrate is reduced, the LCD data driven IC output compensation circuit is beneficial to the design of a narrow border of a liquid crystal display, and the EMI (Electro Magnetic Interference) problem generated when all the output channels are simultaneously opened are improved.

Description

Technical field [0001] The present invention relates to the technical field of liquid crystal display, and in particular to an LCD data drive IC output compensation circuit and a compensation method that are beneficial to the design of a narrow frame of a liquid crystal display. Background technique [0002] Such as figure 1 As shown, when the data line 2 in the liquid crystal panel is output from a data driver IC (Integrated Circuit, integrated circuit) 3, in order to make the signal of each data line 2 reach each pixel in each row at the same time, each line is routed. The impedance of each data line 2 should be basically the same. [0003] In the prior art, in order to make the impedance of each trace basically the same when reaching each pixel, a section of serpentine trace is usually used for implementation. The data line 2 will be connected to the pixel area 1 through a section of serpentine winding. According to the material and length of the data line 2, the impedance of e...

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Problems solved by technology

In this way, when the scan line turns on a certain row of pixels, all the output channels of the data driver IC3 output at the same time. At this time, the impedance of the data lines of each row is the same, so the time for charging each pixel of the same row is the same, so that the screen On the contrary, when the data line impedance design is inconsistent, the charging time of each pixel in the same row will be different, and the screen display corresponding to the data line control area will have uneven problems

[0004] However, with the increase in the number of output channels of a single data-driven IC3, in order to meet the output compensation, the space required for wiring in a serpentine shape will increase. The space will gradually shrink. Therefore, the existing serpentine data line routing method cannot meet the requirements of a narrow-frame liquid crystal display with a small winding space and uniform screen display.

In addition, the current output channels of the data driver IC3 are basically output at the same time, so that when all the output channels are turned on at the same time, a large current needs to be provided to the glass substrate, resulting in EMI (Electro Magnetic Interference, electromagnetic interference) The problem

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