Display Panel TFT Deviation Correction and Efficiency
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Solution Overview
Problem
Conventional analog PWM methods for LED display panels face a trade-off between brightness uniformity and light emitting efficiency, where improving one aspect typically compromises the other due to the need for time-consuming deviation correction between Thin Film Transistors (TFTs), which affects the display frame time and light emitting duration.
Innovation Solution
A display panel and driving method that includes a control circuit and switching elements to simultaneously correct TFT deviations and control light emitting duration based on input end voltage changes, allowing for simultaneous improvement of brightness uniformity and light emitting efficiency by optimizing the threshold voltage setting and gradation data voltage setting processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the scan time of a line is increased to improve deviation correction effect, then brightness uniformity is improved, but the LED emitting duration is reduced and light emitting efficiency is lowered
Solution Approach 1:
The patent applies preliminary action by performing deviation correction for all pixel circuits simultaneously before the light emitting period begins. The correction phase is completed in advance during the scanning period, allowing the light emitting duration to be maximized without compromising brightness uniformity. This separates the correction process from the emission process, ensuring both high uniformity and efficiency.
Solution Approach 2:
The patent segments the frame period into distinct phases: a scanning period for deviation correction and a light emitting period for display. By dividing the time sequence into separate functional segments, the system can dedicate full time to correction without reducing the light emitting duration, resolving the trade-off between uniformity and efficiency.
2Productivity
If the light emitting duration is increased to improve light emitting efficiency, then the LED emitting efficiency is improved, but the effect of correcting the deviation between TFTs is lowered and brightness uniformity deteriorates
Solution Approach 1:
The patent performs all necessary deviation correction actions in advance during the scanning period, before the light emitting period begins. This preliminary correction ensures that by the time light emitting starts, all pixel circuits are properly calibrated, allowing maximum light emitting duration without sacrificing brightness uniformity.
Solution Approach 2:
The patent divides the operation into two distinct time segments: a scanning period dedicated to deviation correction and a light emitting period dedicated to display. This temporal segmentation allows each function to be optimized independently, with full correction time allocated without encroaching on the light emitting duration.
3Manufacturing precision
If a plurality of pixel circuits are sequentially scanned line by line for deviation correction, then the deviation correction can be performed, but the total correction time increases and light emitting duration is reduced
Solution Approach 1:
The patent merges the deviation correction operations of all pixel circuits into a simultaneous process rather than sequential scanning. By applying correction signals to all pixel circuits at the same time during the scanning period, the total correction time is dramatically reduced, allowing sufficient light emitting duration to maintain high efficiency.
Solution Approach 2:
The patent performs simultaneous deviation correction for all pixel circuits in advance during the scanning period, before the light emitting period begins. This preliminary simultaneous action eliminates the time-consuming sequential scanning approach, ensuring both complete correction and maximum light emitting duration.
Data Source
AI summary
A display panel including a plurality of pixel circuits is provided. Each of the plurality of pixel circuits includes a light emitting unit including a light emitting element; a control circuit configured to control a light emitting duration of the light emitting element based on an input end voltage; a first switching element connected between an input end and an output end of the control circuit; and a signal input unit including a second switching element and configured to transmit an input signal to the input end of the control circuit. The first switching elements of each of the plurality of pixel circuits are configured to simultaneously turn on or off.