Data driving circuit and its method of driving data

Abstract

A data driver is composed of an input module, multiple latches, multiple shift registers and a D / A converter. Its method for driving data includes receiving N-bit data divided into m groups, outputting multiple switch signals from shift register, sequentially storing the m groups of data in multiple latches, sequentially outputting them from latches to D / A converter by said switch signals, converting the data to voltage signals, and outputting them to a data line.

Description

technical field [0001] The present invention provides a data driver circuit (Data Driver) and a method for driving data therefrom, in particular to a digital data driver circuit and at least one data line of a display driven by it, so as to save space and save data The method of carrying out the pre-charging (Pre-Charging) function of the line. Background technique [0002] Liquid crystal display (liquid crystal display, LCD) and related display devices are thin and small display devices, and can be found in many electrical products, and the distribution range is also very wide, from the fields of notebook computers and digital cameras to even It is used in the fields of aerospace and medical diagnostic instruments. Among them, the thin film transistor liquid crystal display (TFT LCD) can provide flat, detailed, high-resolution images while maintaining good color contrast and screen scanning refresh rate, and operate under low power; and in recent years, the industry The l...

AI Technical Summary

Problems solved by technology

However, when the resolution of the panel is increased, the size of each pixel is relatively reduced, thus limiting the space of the driving circuit. Therefore, if this digital interface method is to be used, the difficulty will be greatly increased. There are generally two ways to solve this problem. One way is not to make the data drive circuit on the glass with low-temperature polysilicon (LTPS) technology, but to use a method similar to the amorphous silicon liquid crystal display (a-Si LCD) to paste the driver chipset on the glass ( COG), the biggest advantage of this technology is to avoid the problems caused by the connection of components through "wires" or "pins". However, the test of stability such as thermal and thermal shocks needs to be strengthened. Application value of small and medium size panels

In 2000, T.Morita et al. (Toshiba Corp.) proposed a selection circuit (Selecting Circuit) makes the digital-to-analog converter and the latch circuit share the goal to reduce the space requirements of the data drive circuit. In this way, the number of digital-to-analog converters and latch circuits can be greatly reduced. However, in this design Next, the number of bits of data to be processed by each latch circuit at the same time must still be the same as the number of bits of each group of digital data, that is, if the digital data is four-bit input, the latch circuit must also be four-bit If the digital data is a six-bit input, the latch circuit must also be a six-bit latch circuit. Therefore, it is still not perfect in terms of circuit and space saving.

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