Display Panel Driving Circuit Switching Frequency Reduction
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Solution Overview
Problem
Conventional display driving circuits experience high switching frequency and reliability issues due to the high duty ratio and current stress, particularly when using thin-film transistors, which degrades the performance and longevity of the circuit.
Innovation Solution
The introduction of an auxiliary driver and switches that operate at the frame rate, allowing data signals to be sequentially transferred to display cells through a data line, reducing the switching frequency of the switches and distributing the load across multiple scan lines, thereby reducing the stress on the circuit components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If switches are used to share data terminals between odd and even columns, then the number of data drivers is reduced, but the switching frequency becomes n times the frame rate causing reliability degradation
Solution Approach 1:
The invention divides the pixel matrix into multiple sub-regions (e.g., first sub-region and second sub-region) and assigns different scanning schemes to each region. Odd columns in the first sub-region and even columns in the second sub-region are scanned alternately, allowing switches to operate at frame rate rather than n-times frame rate, thus improving reliability while maintaining driver reduction
Solution Approach 2:
The invention dynamically adjusts the scanning pattern by selectively enabling different scan schemes for different sub-regions. The switching frequency is dynamically controlled to match the frame rate in each region, adapting the operation mode to reduce stress on TFT switches while maintaining display performance
2Productivity
If switching frequency is increased to n times frame rate, then data sharing between columns is achieved, but high duty ratio and current stress degrade TFT reliability
Solution Approach 1:
By segmenting the display into sub-regions with different scanning patterns, the invention reduces the switching burden on individual TFTs. Each region operates at a manageable switching frequency (frame rate), preventing the cumulative stress that would occur with uniform high-frequency switching across the entire display
Solution Approach 2:
Different quality requirements are applied to different regions: odd columns in the first sub-region and even columns in the second sub-region receive appropriate scanning treatment. This local differentiation allows each region to operate within reliable switching parameters while maintaining overall display functionality
Data Source
AI summary
Display panels capable of eliminating reliability issues due to high switching frequency. The display panel comprises a data driver outputting first, second, third and fourth data signals in sequence through a data line, a scan driver outputting first and second scan signals in sequence through first and second scan lines and an auxiliary driver generates first and second auxiliary signals in sequence, and first and second display cells commonly receives the first scan signal through the first scan line and receives the first and the second data signal through the data line, and a first switch is coupled to the data line and the second display cell, turning on and off in sequence according to the first auxiliary signal when the first scan signal is applied thereto such that the second and the first display cells receive the first and the second data signals in sequence.