Display Device Luminance Compensation via Camera-Based Look-Up Table Updates
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Solution Overview
Problem
Organic light emitting display devices experience luminance degradation over time due to deterioration of the organic light emitting diode, leading to reduced luminance and afterimages, which existing technologies struggle to accurately compensate for, especially in varying environments and with accumulated deterioration.
Innovation Solution
A display device and method that include a deterioration compensating unit with a look-up table updating mechanism, using a camera to measure luminance, calculate gain values, and update the look-up table to modulate data and compensate for deteriorated sub-pixels, ensuring accurate compensation even in harsh environments and with accumulated deterioration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If the driving time of the organic light emitting display device is increased, then the device can be used longer, but the luminance characteristic deteriorates quickly due to increased deterioration rate of the organic light emitting diode
Solution Approach 1:
The patent applies preliminary action by measuring the luminance of the displayed image and updating the look-up table before significant deterioration occurs. The system proactively compensates for aging effects by continuously monitoring actual luminance output and adjusting compensation parameters in advance, rather than waiting for visible degradation to occur.
Solution Approach 2:
The patent implements feedback by measuring the actual luminance of the displayed image and using this measurement to update the look-up table. The measured luminance feeds back into the compensation mechanism, allowing the system to continuously adjust and refine its compensation strategy based on actual device performance, thereby maintaining luminance characteristics over extended usage periods.
2Reliability
If existing compensation technologies are used, then some deterioration can be compensated, but the compensation accuracy is insufficient especially in varying environments and with accumulated deterioration
Solution Approach 1:
The patent applies parameter changes by dynamically updating the look-up table based on measured luminance values. Instead of using fixed compensation parameters, the system adjusts the compensation parameters (gain values in the look-up table) according to actual measured luminance, allowing adaptation to varying environmental conditions and accumulated deterioration over time.
Solution Approach 2:
The patent implements self-service by enabling the display device to automatically measure its own luminance output and update its own compensation parameters through the look-up table. The system performs self-diagnosis and self-correction without requiring external calibration equipment or manual intervention, thereby maintaining accurate compensation across different environments and usage conditions.
3Productivity
If a look-up table updating mechanism with real-time luminance measurement is implemented, then compensation efficiency is improved, but the device complexity increases due to additional components and processing
Solution Approach 1:
The patent applies universality by integrating the luminance measurement and look-up table update functions into the existing display device architecture. The same display panel is used to display test patterns, and the existing sensing circuits are utilized to measure luminance, rather than requiring entirely separate dedicated components. This multi-functional approach improves compensation efficiency while minimizing the increase in device complexity.
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 improves the efficiency of image compensation by updating the look-up table based on real-time luminance measurements, ensuring the luminance of deteriorated regions is restored to target levels, enhancing image quality and extending the lifespan of the display device.
Implementation Method 1
The luminance of the image displayed on the display panel can be measured by a camera and the camera can be a charged coupled device camera
Data Source
AI summary
A display device according to an example can include a display panel including a plurality of sub pixels to display an image, a memory configured to store a look-up table including a gain value, and a deterioration compensating unit configured to compensate the deterioration of the deteriorated sub pixel based on a sensing voltage input from the display panel and update the look-up table by measuring a luminance of the image displayed on the display panel.