Sub-Pixel Sensing Correction for Temperature-Stable Display Compensation
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Solution Overview
Problem
Display devices face reliability issues due to temperature changes affecting the sensing and compensation of circuit element characteristics, leading to reduced display quality.
Innovation Solution
A display device with a timing controller that senses sub-pixels in alternating periods, calculates average sensing values and normalization constants, and corrects sensing values to compensate for temperature-induced variations, using a data driving circuit and reference voltage lines to improve reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sensing is performed during display operation, then display quality can be maintained through real-time compensation, but temperature changes during sensing reduce reliability
Solution Approach 1:
The patent performs sensing operations during periods when the display is not actively showing images (non-display periods), before the display resumes normal operation. This preliminary timing allows temperature to stabilize between sensing and display operations, ensuring reliable measurements without temperature-induced errors affecting the sensing accuracy.
Solution Approach 2:
The patent implements periodic sensing operations that alternate between sensing periods and display periods. By creating distinct periodic phases where sensing occurs during non-display intervals and display occurs during non-sensing intervals, the system allows temperature to stabilize during each phase, eliminating temperature fluctuations from affecting sensing reliability while maintaining continuous display functionality.
2Manufacturing precision
If compensation is performed using sensing values, then display quality improves, but temperature-induced variations reduce compensation accuracy
Solution Approach 1:
The patent performs compensation calculations using sensing values obtained during stable temperature conditions (non-display periods) before the display resumes operation. This preliminary compensation ensures that the correction values are calculated based on accurate, temperature-stable measurements, thereby improving display quality without the degradation caused by temperature-induced sensing variations.
Solution Approach 2:
The patent establishes periodic cycles where sensing and compensation operations occur during non-display periods when temperature is stable, followed by display periods where the compensated values are applied. This periodic separation ensures that measurement precision is maintained during sensing phases while still achieving manufacturing precision in the final display output.
3Productivity
If sensing is performed continuously, then real-time compensation is achieved, but temperature fluctuations during sensing reduce reliability
Solution Approach 1:
The patent implements periodic sensing operations that occur during non-display periods rather than continuous sensing during display operation. This periodic approach maintains compensation efficiency by regularly updating compensation values while ensuring that each sensing operation occurs under stable temperature conditions, thereby resolving the contradiction between productivity and reliability.
Data Source
AI summary
A display device includes: a display panel where a plurality of sub-pixels and a plurality of reference voltage lines connected to the plurality of sub-pixels are disposed, a data driving circuit connected to the plurality of reference voltage lines, for sensing a first sub-pixel among the plurality of sub-pixels in a first period, and for sensing a second sub-pixel among the plurality of sub-pixels in a second period after the first period, and a timing controller for correcting a sensing value obtained by sensing the first sub-pixel based on a sensing value obtained by sensing the second sub-pixel.