Display Panel Anode Reset Voltage Tuning for Dark-Mode Color Balance
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Solution Overview
Problem
In dark mode, when a user drags light-colored display content on a screen, color cast occurs due to the uneven brightness transition of red, green, and blue sub-pixels, disrupting white balance and user experience.
Innovation Solution
The display panel employs different anode reset voltages for green sub-pixels, adjusting the light-emitting duration of each sub-pixel to achieve balanced brightness, and uses separate reset lines for anode and gate reset circuits to ensure uniform voltage distribution, optimizing the layout of reset lines for high pixel density.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the same anode reset voltage is used for all sub-pixels, then the device complexity is reduced, but color cast occurs during drag operations in dark mode due to uneven brightness transition
Solution Approach 1:
The patent applies local quality by using different anode reset voltages for different sub-pixel types (red and blue sub-pixels use a first anode reset voltage, while green sub-pixels use a second anode reset voltage that is higher than the first). This localized differentiation compensates for the different light-emitting characteristics of each sub-pixel type, ensuring uniform brightness transition during drag operations and eliminating color cast without requiring complete redesign of the reset circuit architecture
2Object-affected harmful factors
If different anode reset voltages are used for different sub-pixels, then white balance is maintained during drag operations, but the device complexity increases due to separate reset lines
Solution Approach 1:
The patent segments the reset voltage distribution by introducing separate reset lines for different sub-pixel types. Specifically, red and blue sub-pixels are connected to a first anode reset line receiving the first anode reset voltage, while green sub-pixels are connected to a second anode reset line receiving the second anode reset voltage. This segmentation allows independent voltage control for each sub-pixel type, maintaining white balance during dynamic operations
Solution Approach 2:
The patent implements multi-functionality by designing the anode reset circuit to serve multiple purposes: it not only resets the anode of the light-emitting element but also functions as a voltage regulation mechanism that compensates for different sub-pixel characteristics. The circuit structure remains largely unchanged across different sub-pixels, with only the reset voltage level varying, thereby achieving complex functionality through a universal circuit design
3Duration of action of moving object
If higher anode reset voltage is used for green sub-pixels, then the light-emitting duration is adjusted to achieve balanced brightness, but voltage drops increase
Solution Approach 1:
The patent changes the voltage parameter by applying a higher second anode reset voltage to green sub-pixels compared to the first anode reset voltage for red and blue sub-pixels. This parameter change extends the light-emitting duration of green sub-pixels, compensating for their different light-emitting efficiency and ensuring balanced brightness across all sub-pixel types during dynamic content transitions
Data Source
AI summary
A display panel including sub-pixels each including a pixel circuit and a light-emitting element. The pixel circuit includes a plurality of anode reset circuits. The sub-pixels include a red sub-pixel, a green sub-pixel, and a blue sub-pixel. Anode reset circuits in the red sub-pixel and the blue sub-pixel are configured to respectively reset anodes of the light-emitting elements in the red sub-pixel and the blue sub-pixel by using a first anode reset voltage. The anode reset circuit of the green sub-pixel is configured to reset an anode of the light-emitting element of the green sub-pixel by using a second anode reset voltage greater than the first anode reset voltage.