OLED Driving Circuit Brightness Consistency Flicker Reduction
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Solution Overview
Problem
Current OLED display products suffer from poor display effects due to inconsistencies in brightness between data write frames and display holding frames, leading to flicker and reduced display quality.
Innovation Solution
A method and device for driving a display panel that determines a brightness mode, calculates a data voltage characterization value, and inputs a corresponding holding voltage to the source electrode of a drive transistor in each sub-pixel, ensuring consistent brightness across frames.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a fixed holding voltage is used for all brightness modes, then the device complexity is reduced, but the brightness consistency between data write frames and display holding frames deteriorates
Solution Approach 1:
The patent applies parameter changes by introducing brightness mode identification and selecting different holding voltages based on the identified mode. The system determines the brightness mode (first, second, or third mode) and selects corresponding holding voltages (first holding voltage, second holding voltage, or third holding voltage) to maintain brightness consistency across different operating conditions without significantly increasing device complexity.
2Use of energy by moving object
If the refresh rate is reduced to save energy, then the power consumption is reduced, but the display quality and brightness consistency deteriorate
Solution Approach 1:
The patent applies dynamics by making the holding voltage dynamic rather than fixed. The system adjusts the holding voltage based on the brightness mode identified during operation, allowing the display to maintain quality at lower refresh rates. The dynamic adjustment of holding voltages compensates for the reduced refresh rate and maintains brightness consistency.
Solution Approach 2:
The patent changes the parameter of holding voltage based on brightness mode to enable low refresh rate operation while maintaining display quality. By selecting different holding voltages for different brightness modes, the system can reduce refresh rate without sacrificing display quality or introducing flicker.
3Stability of the object's composition
If different holding voltages are used for different brightness modes, then the brightness consistency is improved, but the device complexity increases
Solution Approach 1:
The patent applies preliminary action by pre-defining multiple holding voltages corresponding to different brightness modes before operation. The system identifies the brightness mode and selects the appropriate pre-defined holding voltage, avoiding the need for complex real-time calculations and reducing overall device complexity while maintaining brightness consistency.
Data Source
AI summary
A method and device for driving a display panel and a display device. The method for driving a display panel includes: determining a brightness mode of the display panel, where the same display grayscale corresponds to different data voltages in different brightness modes; determining a data voltage characterization value according to the brightness mode, where the data voltage characterization value is used for characterizing a data voltage level in the brightness mode; determining a holding voltage corresponding to the data voltage characterization value according to the data voltage characterization value; and inputting, in a display holding frame of a current display image, the holding voltage to a source electrode of a drive transistor in each sub-pixel of the display panel.