Display Panel Polarity Inversion Segmentation for Flicker Reduction
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Solution Overview
Problem
Liquid crystal display panels experience flickering due to polarity inversion, leading to inconsistent brightness and display quality issues when switching between frames, as all pixels of the same color change polarity, causing significant non-uniform brightness.
Innovation Solution
The display panel employs N pixel column unit groups with alternating polarity data signals for each color pixel column, ensuring that during frame inversion, some pixels receive a positive polarity data signal while others receive a negative polarity signal, maintaining consistent light transmission and avoiding flickering.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If polarity inversion driving is applied to prevent permanent damage to liquid crystal materials, then the reliability of the display panel is improved, but flickering occurs during frame switching causing display quality to deteriorate
Solution Approach 1:
The display panel divides pixels of the same color into multiple groups (first group and second group) that are driven by different data outputs. During polarity inversion, one group receives positive polarity signals while the other receives negative polarity signals, segmenting the simultaneous polarity change into staggered changes that prevent flickering while maintaining protection against permanent damage.
Solution Approach 2:
The patent implements periodic polarity inversion at frame boundaries while using complementary periodic signaling for different pixel groups. The first data output and second data output provide data signals with opposite polarities in a periodic manner, ensuring that when one group undergoes polarity inversion, the other group maintains stable signaling, thereby eliminating flicker while preserving the protective polarity inversion effect.
2Device complexity
If all pixels of the same color are charged with the same polarity voltage during frame display, then the driving circuit is simplified, but significant non-uniform brightness occurs during polarity inversion
Solution Approach 1:
The pixel columns are segmented into different groups (first pixel column unit and second pixel column unit) that receive different polarity signals. This segmentation allows the use of multiple data outputs providing opposite polarity signals, which resolves the brightness uniformity issue during polarity inversion while keeping each group's driving circuit relatively simple.
Solution Approach 2:
Different regions of the display panel are assigned different signal polarities locally. The first data output provides positive polarity signals to certain pixel groups while the second data output provides negative polarity signals to other pixel groups, creating local quality differences that eliminate non-uniform brightness during polarity inversion.
3Reliability
If frame inversion or column inversion is used for polarity switching, then the liquid crystal material is protected from permanent damage, but flicker phenomenon occurs when switching between frames
Solution Approach 1:
The patent segments pixels into different groups driven by different data outputs with opposite polarities. During frame inversion, this segmentation ensures that not all pixels of the same color switch polarity simultaneously, but in a staggered manner, which protects the liquid crystal material while eliminating the flicker phenomenon associated with simultaneous polarity switching.
Solution Approach 2:
The patent uses periodic polarity inversion combined with complementary periodic signaling from multiple data outputs. The first and second data outputs provide signals with opposite polarities in a periodic pattern, ensuring that polarity inversion occurs in a controlled, staggered sequence that protects liquid crystal materials without producing flicker.
Data Source
AI summary
The present disclosure provides a display panel, display device and driving method thereof. The display panel includes: N pixel column unit groups, each including a first pixel column unit and a second pixel column unit; N data line unit groups one-to-one corresponding to the N pixel column unit groups, each including a first data line unit and a second data line unit; N driving unit groups one-to-one corresponding to the N data line unit groups, each including a first driving unit and a second driving unit; and N data output groups corresponding to the N driving unit groups in one-to-one correspondence, each including a first data output and a second data output, and a polarity of data signal output from the first data output is opposite to a polarity of data signal output from the second data output.