Display Panel Pixel Driving for Uniform Brightness and Narrow Bezels
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing display panels exhibit significant brightness differences between light-emitting devices driven by different pixel circuits, leading to poor brightness uniformity and requiring a large bezel area due to multiple shift register circuits.
Innovation Solution
A method for driving a display panel where threshold compensation modules in multiple rows of pixel circuits are simultaneously activated within a preset time interval, and data write modules are sequentially turned on with varying conduction durations to balance threshold voltage compensation across rows, reducing the need for multiple shift register circuits and minimizing bezel size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple shift register circuits are used to drive different rows of pixel circuits, then the display panel can be driven, but the bezel area increases and device complexity increases
Solution Approach 1:
The patent merges the functions of multiple shift register circuits into a single shift register circuit by using time-division multiplexing. The single shift register circuit sequentially drives multiple rows of pixel circuits through the data write module, eliminating the need for multiple parallel shift register circuits and thereby reducing the bezel area while maintaining full display driving capability
Solution Approach 2:
The single shift register circuit is designed to perform multiple functions by sequentially driving different rows of pixel circuits. The data write module acts as a universal interface that can write data to any row of pixel circuits at the appropriate time, making the shift register circuit multi-functional rather than dedicated to a single row
2Ease of manufacture
If threshold compensation is applied to all rows simultaneously, then manufacturing is simple, but brightness uniformity deteriorates due to threshold voltage differences
Solution Approach 1:
The patent applies local quality by providing individualized threshold compensation for each row of pixel circuits. The data write module writes different compensation data to different rows based on their specific threshold voltage characteristics, ensuring that each row receives tailored compensation rather than a uniform compensation value, thereby improving brightness uniformity
Solution Approach 2:
The threshold compensation mechanism uses feedback by measuring the actual threshold voltage of each pixel circuit and adjusting the drive signal accordingly. The compensation data is written to the pixel circuits based on their individual threshold voltage measurements, creating a closed-loop system that automatically corrects for manufacturing variations
3Ease of operation
If data write modules are turned on simultaneously in all rows, then operation is simple, but brightness uniformity deteriorates due to varying conduction durations
Solution Approach 1:
The patent uses periodic action by sequentially activating data write modules in different rows at different time intervals. The single shift register circuit outputs data in a sequential manner, with each row receiving its data at a specific time point in the sequence, ensuring that data writing occurs in a controlled periodic fashion rather than simultaneously, which maintains brightness uniformity while keeping operation simple
Data Source
AI summary
A display panel includes multiple rows of pixel circuits. A pixel circuit includes a drive module, a light emission module, a data write module and a threshold compensation module. A method for driving a display panel includes: within a display frame, controlling threshold compensation modules in at least two rows of pixel circuits to be in the conduction state within the preset time interval; within the preset time interval, controlling data write modules in the at least two rows of pixel circuits to be successively turned on, and in the at least two rows of pixel circuits, controlling the conduction duration of data write modules in the previous row of pixel circuits to be less than the conduction duration of data write modules in the next row of pixel circuits.