LCD Panel Driving Method for Uniform Luminance
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Solution Overview
Problem
Increasing the frame rate of LCD panels to reduce image distortion such as motion blur results in decreased charging and recovery times for data and common voltages, leading to issues like greenish effects, non-uniform luminance distribution, and cross talk.
Innovation Solution
A method of driving a display panel by applying data voltages to adjacent data lines with opposite polarities and inverting these polarities during consecutive frames, while applying the same gate signal to adjacent pixel rows, which reduces distortion of the common voltage and achieves uniform luminance distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the frame rate of the LCD panel is increased to reduce motion blur, then image distortion such as motion blur is improved, but the charging time and recovery time for data and common voltages are decreased, leading to image distortion such as greenish effects, non-uniform luminance distribution, and cross talk
Solution Approach 1:
The patent applies periodic polarity inversion to adjacent data lines and gate lines. By alternating the polarity of voltages applied to adjacent lines in a periodic manner, the method enables sufficient charging and recovery time within each frame period while maintaining high frame rates. This periodic action allows the liquid crystal molecules to properly respond to voltage changes without requiring extended charging time, thus resolving the contradiction between high frame rate and sufficient charging time.
Solution Approach 2:
The patent changes the polarity parameter of voltages applied to adjacent data lines and gate lines. By inverting the polarity alternately between adjacent lines, the method optimizes the charging and discharge characteristics of the liquid crystal cells. This parameter change allows for reduced charging time requirements while preventing image distortion, thereby enabling high frame rates without sacrificing voltage recovery time.
2Reliability
If the frame rate is increased, then motion blur is reduced, but image distortion such as greenish effects and non-uniform luminance distribution occurs due to insufficient voltage recovery time
Solution Approach 1:
The periodic polarity inversion method ensures that adjacent data lines and gate lines alternate their voltage polarity systematically. This periodic action creates consistent charging and discharge cycles that prevent voltage distortion and ensure uniform luminance distribution across the display panel, even at high frame rates where recovery time is limited.
Solution Approach 2:
The patent converts the potential harm of high frame rates (insufficient recovery time leading to image distortion) into a benefit by using alternating polarity inversion. This approach transforms what would be a problematic condition into an advantageous mechanism that actually improves image quality by preventing greenish effects and non-uniform luminance distribution through systematic voltage management.
3Speed
If the frame rate is increased, then motion blur is reduced, but cross talk occurs due to decreased voltage recovery time
Solution Approach 1:
The systematic periodic inversion of polarity on adjacent lines creates well-defined charging and discharge phases that prevent voltage leakage and cross talk between adjacent pixels. This periodic action ensures that voltage signals remain confined to their intended lines even at high frame rates, eliminating cross talk while maintaining high-speed performance.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach decreases distortion and cross talk, resulting in improved luminance uniformity and reduced image artifacts like non-uniform luminance distribution and cross talk.
Implementation Method 1
a liquid crystal display (LCD) apparatus includes an LCD panel, a data driver, and a gate driver. The LCD panel may include an array substrate, a color filter substrate, and a liquid crystal layer
Data Source
AI summary
A display apparatus includes a first pixel including a first pixel electrode connected to first data and gate lines, a second pixel including a second pixel electrode connected to a second data and gate lines, a third pixel including a third pixel electrode connected to a third data line and the first gate line, a fourth pixel including a fourth pixel electrode connected to a fourth data line and the second gate line, a fifth pixel including a fifth pixel electrode connected to a fifth data line and the second gate line, a sixth pixel including a sixth pixel electrode connected to a sixth data line and the first gate line, a seventh pixel including a seventh pixel electrode connected to a seventh data line and the second gate line, and an eighth pixel including an eighth pixel electrode connected to an eighth data line and the first gate line.