Display Pixel Aging Compensation Using Non-Display Sensing
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Solution Overview
Problem
Display devices deteriorate with age, leading to reduced quality and desirability.
Innovation Solution
A display device with first and second pixels, a sensor to sense the second pixel current, and a degradation compensator to generate and apply compensation values based on sensed data to calibrate image data, thereby compensating for pixel degradation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If display devices are used over time, then they provide continuous display functionality, but pixel degradation occurs leading to reduced image quality
Solution Approach 1:
The patent implements a feedback mechanism where a sensor continuously monitors the current of second pixels in the non-display area, and this sensing data is fed back to a degradation compensator. The compensator calculates pixel age based on accumulated data and adjusts compensation values accordingly, creating a closed-loop system that actively counteracts degradation over time.
Solution Approach 2:
The patent applies preliminary compensation by calculating pixel degradation based on accumulated usage data before it significantly impacts display quality. The degradation compensator proactively adjusts image data using pre-calculated compensation values derived from representative compensation data and sensing information, preventing noticeable degradation rather than correcting it after the fact.
2Reliability
If compensation mechanisms are added to counteract degradation, then image quality is preserved, but device complexity increases
Solution Approach 1:
The patent makes the second pixels in the non-display area serve multiple functions: they act as both display pixels (first pixels) and as sensing elements (second pixels) for monitoring degradation. This multi-functionality reduces the need for separate dedicated sensing components, thereby limiting the increase in device complexity while still enabling degradation compensation.
Solution Approach 2:
The patent introduces a degradation compensator as an intermediary component that processes sensing data from the sensor and adjusts image data before it reaches the display pixels. This intermediary layer abstracts the complexity of degradation compensation algorithms, isolating the complex processing from the display hardware itself and making the system more manageable.
3Measurement precision
If sensing data is collected and processed to calculate compensation values, then accurate degradation compensation is achieved, but processing time and computational resources increase
Solution Approach 1:
The patent performs preliminary calculations by pre-storing representative compensation data that captures typical degradation patterns. During operation, the degradation compensator retrieves and applies these pre-computed values based on current sensing data, rather than performing complex degradation modeling in real-time, thus reducing processing time while maintaining accuracy.
Solution Approach 2:
The patent monitors only a subset of pixels (second pixels in non-display areas) rather than all display pixels, using this partial sampling to infer the degradation state of the entire display. This partial monitoring approach reduces the amount of sensing data that needs to be processed while still providing accurate degradation measurement through representative sampling.
Data Source
AI summary
A display device may include first pixels disposed in a display area and including respective first driving transistors. A second pixel is disposed in a non-display area and includes a second driving transistor. A sensor is configured to sense a current of the second pixel during a sensing period and generate sensing data. A degradation compensator is configured to convert first image data into second image data. A data driver is configured to generate data signals based on the second image data and supply the data signals to the first pixels. The degradation compensator calculates an age of the first pixels based on accumulating the second image data, converts the first image data into the second image data by deriving a compensation value from representative compensation data according to the age of the first pixels, and calibrates the representative compensation data based on the sensing data.