Display Panel Pixel Circuit Flicker Reduction via Segmented Data Adjustment
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Solution Overview
Problem
Display panels experience screen flicker due to unstable driving current caused by threshold voltage drift in low-frequency driving modes, leading to delayed brightness achievement and observable flicker by human eyes.
Innovation Solution
The operation process of the pixel circuit is redesigned with a data adjustment stage between data refresh periods, including multiple data writing frames and holding frames, where the first data adjustment stage has more data writing frames and fewer holding frames, and the second stage has fewer data writing frames but more holding frames, to stabilize the driving transistor and prevent flicker.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If low-frequency driving mode is used, then power consumption is reduced, but screen flicker occurs due to unstable driving current
Solution Approach 1:
The patent divides the frame period into multiple sub-frames (first sub-frame, second sub-frame, third sub-frame) with different refresh rates. The first sub-frame uses a first refresh rate, the second sub-frame uses a second refresh rate, and the third sub-frame uses a third refresh rate. This segmentation allows the system to operate at lower refresh rates in certain periods to reduce power consumption while maintaining stability through multiple refresh cycles in other periods, thereby resolving the contradiction between power consumption and driving current stability.
Solution Approach 2:
The patent dynamically adjusts the refresh rate based on the operating state. When the display is in a stable state, a lower refresh rate is used to save power. When threshold voltage drift is detected or during transitions, the refresh rate is increased to stabilize the driving current. This dynamic adjustment resolves the contradiction by adapting the refresh rate to current system conditions rather than using a fixed rate.
2Use of energy by moving object
If data refresh frequency is reduced, then power consumption decreases, but brightness achievement is delayed
Solution Approach 1:
The patent segments the frame period into multiple sub-frames with different refresh rates. By incorporating multiple refresh cycles within the frame period, the system can quickly establish stable brightness levels when needed while maintaining lower average power consumption. The segmented structure allows rapid brightness achievement in critical periods without permanently increasing power consumption.
Solution Approach 2:
The patent implements periodic refresh cycles at different rates within the frame period. By alternating between different refresh rates in periodic cycles, the system can rapidly achieve expected brightness through multiple quick refreshes when necessary, while maintaining lower overall power consumption through extended periods of reduced refresh activity.
3Reliability
If multiple data writing frames are used in the first data adjustment stage, then driving transistor stability improves, but operation time increases
Solution Approach 1:
The patent segments the data adjustment process into multiple stages (first data adjustment stage, second data adjustment stage) with different numbers of data writing frames. The first stage uses more data writing frames to rapidly stabilize the driving transistor, while the second stage uses fewer frames to maintain stability. This segmentation allows the system to achieve transistor stability quickly without unnecessarily extending the entire operation time.
Solution Approach 2:
The patent applies partial action by using a large number of data writing frames only in the first data adjustment stage where stability is most critical, rather than uniformly applying maximum refresh rates throughout. This concentrated approach achieves the necessary stability with minimal overall time expenditure.
4Reliability
If holding frames are increased, then driving transistor stability improves, but screen flicker reduction is delayed
Solution Approach 1:
The patent segments the frame period into multiple sub-frames with different refresh rates. By incorporating multiple refresh cycles in the first, second, and third sub-frames, the system can rapidly reduce flicker through repeated refresh operations while maintaining lower overall power consumption. The segmented structure allows quick flicker reduction without permanently increasing operation time.
Solution Approach 2:
The patent implements periodic refresh cycles at varying rates throughout the frame period. By alternating between different refresh rates in periodic cycles, the system can rapidly reduce screen flicker through multiple quick refreshes when needed, while maintaining lower overall power consumption through extended periods of reduced refresh activity.
Data Source
AI summary
A display panel includes a pixel circuit. An operation process of the pixel circuit includes a first data refresh period, a data adjustment stage, and a second data refresh period set in sequence, the data adjustment stage includes a first data adjustment stage. The first data adjustment stage includes T1 first sub-data adjustment stages set in sequence, each first sub-data adjustment stage includes m1 data writing frames and n1 holding frames. The operation process of the pixel circuit further includes a first data refresh frequency F21 and a second data refresh frequency F22, and F21<F22. When the pixel circuit is operated at the first data refresh frequency F21, the first data adjustment stage includes T11 first sub-data adjustment stages set in sequence. When the pixel circuit is operated at the second data refresh frequency F22, the first data adjustment stage includes T21 first sub-data adjustment stages set in sequence. T11>T21.