Dual Data Line Driver Circuit for LCD Pixel Charging
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Solution Overview
Problem
High-resolution liquid crystal display devices face challenges in reliably charging pixels with display data due to insufficient precharging of pixels with target voltage, as existing technologies supply a common voltage during the precharge period, preventing accurate voltage application to all pixels.
Innovation Solution
A liquid crystal display device and driving method that utilize two data line driver circuits and a display control circuit to output corrected grayscale voltages at different times during the horizontal scanning period, ensuring each data line is connected and disconnected appropriately to ensure accurate voltage application to pixels, allowing for reliable charging of pixels with desired display data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a common voltage (Vcom) is supplied to the source line in a precharge period, then the source line can be precharged, but pixels cannot be precharged with a voltage corresponding to display data, resulting in some pixels not reaching target voltage
Solution Approach 1:
The data line driver circuit is divided into two separate circuits: a first data line driver circuit that outputs corrected grayscale voltages and a second data line driver circuit that outputs original grayscale voltages. This segmentation allows different voltage types to be supplied to different pixels simultaneously, resolving the contradiction between reliable precharging and precise voltage application.
Solution Approach 2:
The first data line driver circuit precharges pixels with corrected grayscale voltages before the second data line driver circuit supplies the final display data voltages. This preliminary action ensures pixels reach target voltages reliably while maintaining voltage precision through the two-stage process.
2Manufacturing precision
If the resolution is increased, then the display quality is improved, but the pixel charge period becomes shorter, resulting in insufficient pixel charging
Solution Approach 1:
The two data line driver circuits operate in parallel with overlapping time periods, ensuring continuous voltage supply to pixels. The first circuit's corrected voltages and the second circuit's original voltages work together throughout the scanning period, effectively extending the useful charging action despite the shortened overall period required for high resolution.
3Reliability
If two data line driver circuits are used to output corrected and original grayscale voltages, then pixels can be reliably charged with desired display data, but the device complexity increases
Solution Approach 1:
The first and second data line driver circuits are merged into a unified data driving system that shares common control signals, timing mechanisms, and pixel connection infrastructure. This combining approach achieves reliable pixel charging through dual-circuit functionality while minimizing the increase in overall device complexity.
Data Source
AI summary
In a liquid crystal display device, in a first half of one horizontal scanning period, a first data line driver circuit outputs a corrected grayscale voltage obtained by correcting an input grayscale voltage corresponding to input display data to a plurality of data lines, and a second data line driver circuit is electrically disconnected from the plurality of data lines, and in a second half of one horizontal scanning period, the second data line driver circuit outputs an input grayscale voltage corresponding to the input display data to the plurality of data lines, and the first data line driver circuit is electrically disconnected from the plurality of data lines.