Display Panel Compensation Using Lighting Voltage
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Solution Overview
Problem
The mura phenomenon in display panels due to instability in the excimer laser annealing process results in poor brightness uniformity, which existing compensation methods inadequately address, leading to issues like color cast and excessive data storage requirements.
Innovation Solution
A compensation method for display panels that determines whether the compensation data voltage is in a dark-state voltage range, using either the lighting voltage or the compensation data voltage to adjust sub-pixels, thereby reducing color cast and data storage needs by maintaining constant lighting voltages across sub-pixels of the same color.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If external optical compensation is used to ameliorate the mura phenomenon, then brightness uniformity is improved, but the compensation effect is limited and color cast occurs
Solution Approach 1:
The patent changes the compensation parameter from optical parameters to electrical parameters (lighting voltage). By adjusting the lighting voltage applied to sub-pixels, the invention achieves more precise control over light emission and eliminates color cast while improving brightness uniformity, overcoming the limitations of external optical compensation methods
Solution Approach 2:
The patent replaces the mechanical/optical compensation system with an electrical control system. Instead of using external optical components to compensate for mura, the invention uses electrical signals (lighting voltage) to directly control sub-pixel emission, achieving more accurate and versatile compensation
2Illumination intensity
If compensation data voltage is increased to improve brightness uniformity, then mura phenomenon is reduced, but data storage requirements increase
Solution Approach 1:
The patent changes the compensation approach from storing complex compensation data for each sub-pixel to storing and transmitting simple lighting voltage values. This parameter change dramatically reduces data storage requirements while maintaining effective compensation for the mura phenomenon
Solution Approach 2:
The lighting voltage serves multiple functions: it compensates for mura phenomenon, controls brightness, and eliminates color cast. This multi-functionality reduces the need for separate compensation data, thereby reducing overall data storage requirements
3Illumination intensity
If compensation data voltage is excessively large to address mura, then brightness uniformity improves, but sub-pixels fail to emit light causing black dots
Solution Approach 1:
The patent changes the compensation parameter from data voltage to lighting voltage, which directly controls the light emission threshold. By adjusting lighting voltage, the invention ensures sub-pixels remain in the emission state while achieving brightness uniformity, preventing black dot formation
Solution Approach 2:
The patent dynamically adjusts lighting voltage to maintain sub-pixels in the emission state. This dynamic control ensures that compensation is achieved without pushing sub-pixels into the non-emission state, thereby maintaining emission reliability and preventing black dots
Data Source
AI summary
Provided are a compensation method for a display panel and a display device. The compensation method for a display panel includes: obtaining a first display grayscale obtained to be displayed in a to-be-displayed image by a first sub-pixel, and obtaining a first display data voltage corresponding to the first display grayscale; determining whether the first display data voltage is greater than a low brightness demarcation voltage; and if yes, obtaining a first compensation data voltage corresponding to the first sub-pixel according to the first display grayscale; and determining, according to a lighting voltage corresponding to the first sub-pixel, whether the first compensation data voltage is in a dark-state voltage range; and if yes, compensating the first sub-pixel by using the lighting voltage corresponding to the first sub-pixel, and if not, compensating the first sub-pixel by using the first compensation data voltage.