Region-Based Light Sensor Array for Display Luminance Compensation
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Solution Overview
Problem
Organic EL displays experience luminance reduction over time, leading to luminance nonuniformity and 'burn-in' issues due to cumulative light emitting time, which existing technologies struggle to effectively compensate for.
Innovation Solution
A display device with a screen unit, drive unit, signal processing unit, and selector, where light sensors detect luminance and output signals to correct video signals, sectioning the screen into regions to reduce the number of sensors needed, and using amplifiers and converters to process luminance signals, thereby compensating for luminance deterioration and preventing 'burn-in'.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If light sensors are arranged for each pixel to detect luminance, then luminance detection precision is improved, but device complexity and cost increase
Solution Approach 1:
The screen is divided into multiple regions, with each region served by a dedicated light sensor. This segmentation allows luminance detection for multiple pixels using a single sensor through time-division or spatial-division multiplexing, reducing the total number of sensors while maintaining detection precision for each region.
Solution Approach 2:
Each light sensor serves multiple pixels within its assigned region by detecting luminance at different time points or through signal multiplexing. This multi-functionality allows one sensor to perform the detection work for multiple pixels, reducing the overall sensor count while maintaining comprehensive luminance monitoring capability.
2Measurement precision
If light sensors are arranged for each pixel to detect luminance, then luminance detection precision is improved, but manufacturing cost increases
Solution Approach 1:
By segmenting the screen into regions and assigning one sensor per region, the total number of sensors is reduced. This directly lowers manufacturing costs for sensor materials, assembly processes, and quality control, while still enabling precise luminance detection through region-based monitoring.
Solution Approach 2:
Multiple pixel luminance detection functions are merged into a single sensor through time-division or spatial-division multiplexing. This consolidation reduces component count and assembly complexity, lowering manufacturing costs while maintaining the ability to detect luminance across multiple pixels.
3Device complexity
If cumulative light emitting time is not compensated, then device structure remains simple, but luminance nonuniformity and burn-in occur
Solution Approach 1:
The system continuously monitors luminance in each region using light sensors and feeds this information back to the control unit. The control unit then adjusts drive signals to compensate for luminance reduction due to cumulative light emitting time, preventing burn-in and maintaining uniformity without requiring complex hardware modifications.
Solution Approach 2:
The system proactively detects luminance degradation trends through periodic measurements and applies compensatory adjustments before significant burn-in occurs. This preliminary action prevents the harmful effects of cumulative light emitting time from manifesting as permanent image degradation.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively compensates for luminance reduction and prevents 'burn-in' by correcting video signals based on real-time luminance data, reducing the number of sensors and components needed, and simplifying the display panel structure while lowering costs.
Implementation Method 1
The light sensor is arranged with respect to each region and outputs a luminance signal in accordance with the light emission
Data Source
AI summary
A display device includes: a screen unit; a drive unit; a signal processing unit; and a selector, wherein the screen unit includes rows of scanning lines, columns of signal lines, matrix-state pixel circuits and a light sensor, the drive unit includes a scanner supplying a control signal to the scanning lines and a driver supplying a video signal to the signal lines, the screen unit is sectioned into plural regions each having plural pixel circuits, the pixel circuit emits light in accordance with the video signal, the light sensor is arranged with respect to each region and outputs a luminance signal in accordance with the light emission, the selector supplies plural luminance signals to the signal processing unit by switching the signals, and the signal processing unit corrects the video signal in accordance with the luminance signals and supplies the video signal to the driver.