Display Image-Sticking Compensation Using Ambient-Light Spectra
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Solution Overview
Problem
Display devices experience image sticking due to pixel deterioration, which is exacerbated by varying ambient light conditions, leading to inaccurate luminance and color perception by users.
Innovation Solution
Incorporating an ambient light sensor and an image sticking compensator with lookup tables to generate compensation values based on ambient light and pixel deterioration spectra, ensuring accurate luminance and color compensation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If image sticking compensation is performed based on accumulated deterioration amount, then pixel deterioration is compensated, but luminance and color accuracy deteriorates under ambient light conditions
Solution Approach 1:
The patent applies parameter changes by considering both the accumulated deterioration amount and ambient light conditions as varying parameters. The compensation value is dynamically adjusted based on the combination of pixel deterioration state and ambient light spectrum, transforming the compensation approach from static to adaptive, thereby resolving the contradiction between compensation accuracy and color accuracy under different lighting conditions.
Solution Approach 2:
The patent implements preliminary action by pre-calculating and storing compensation values in lookup tables for various combinations of deterioration amounts and ambient light conditions. This allows the system to quickly retrieve and apply appropriate compensation values without real-time complex calculations, ensuring both compensation effectiveness and color accuracy under varying ambient light.
2Device complexity
If simple deterioration-based compensation is applied, then compensation process is simple, but compensation accuracy under varying ambient light deteriorates
Solution Approach 1:
The patent uses preliminary action by pre-computing and storing compensation values in lookup tables during manufacturing or initialization. The tables contain compensation data for various combinations of deterioration amounts and ambient light conditions, allowing the runtime system to simply query and apply values without performing complex real-time calculations, thus maintaining simplicity while improving accuracy.
Solution Approach 2:
The patent introduces an intermediary mechanism (lookup table) that mediates between the simple input parameters (deterioration amount and ambient light intensity) and the complex compensation requirements. The lookup table acts as a pre-processed database that translates simple queries into accurate compensation values, resolving the contradiction between process simplicity and compensation accuracy.
Data Source
AI summary
A display device includes: a display panel including a plurality of pixels; an ambient light sensor configured to sense an ambient light of the display panel; and an image sticking compensator configured to perform an image sticking compensation operation on the pixels. The image sticking compensator includes an accumulation lookup table configured to generate a wavelength spectrum of an accumulated deterioration amount of the pixels based on the accumulated deterioration amount of the pixels; and a compensation lookup table configured to generate a compensation value of the pixels for compensating an input image data based on a wavelength spectrum of the ambient light and the wavelength spectrum of the accumulated deterioration amount. An ambient light lookup table included in the image sticking compensator or the ambient light sensor is configured to generate the wavelength spectrum of the ambient light based on the ambient light of the display panel.