Display Device Burn-In Suppression via Dynamic Brightness Adjustment
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Solution Overview
Problem
Existing display devices, such as organic EL devices, suffer from the burn-in phenomenon due to continuous voltage application, leading to reduced emission characteristics and shortened lifespan, and existing correction techniques either shorten the device's lifespan or compromise image quality by reducing contrast and three-dimensional effects.
Innovation Solution
A display device with a light emission amount acquisition unit, data accumulation unit, high brightness adjustment unit, and low brightness adjustment unit that dynamically adjusts video signal brightness based on accumulated data to prevent burn-in, ensuring balanced light emission and maintaining image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If burn-in correction is performed by controlling current amount to uniformize light emission amount, then burn-in phenomenon is suppressed, but luminous body deteriorates and lifespan is shortened
Solution Approach 1:
The patent changes the control parameter from current amount to video signal brightness levels. By dividing video signals into high brightness and low brightness sides and applying different brightness reduction processing to each, the system achieves burn-in suppression without uniformly reducing current, thereby extending luminous body lifespan while maintaining correction effectiveness.
Solution Approach 2:
The patent applies different brightness reduction processing to different brightness regions of the video signal. The high brightness adjustment unit and low brightness adjustment unit process different brightness ranges with different strategies, creating localized quality control that preserves overall image quality while preventing burn-in in specific high-emission areas.
2Reliability
If peak brightness of high brightness side is suppressed to obtain burn-in suppression effect, then burn-in is reduced, but contrast deteriorates and three-dimensional effect is lost
Solution Approach 1:
The patent changes the approach from suppressing peak brightness to reducing brightness of both high and low brightness sides in a coordinated manner. This parameter change maintains the relative brightness relationships and contrast while still achieving burn-in suppression through the brightness reduction processing applied to high brightness video signals.
Solution Approach 2:
The patent merges the functions of high brightness adjustment and low brightness adjustment into a unified brightness reduction processing system. By coordinating the processing of both brightness ranges, the system maintains overall image contrast and three-dimensional effects while achieving burn-in suppression through the combined action of both adjustment units.
3Illumination intensity
If brightness of low brightness side is reduced in conjunction with high brightness side, then contrast is maintained, but processing complexity increases
Solution Approach 1:
The patent segments the video signal processing into distinct high brightness and low brightness processing paths. By dividing the brightness adjustment function into separate adjustment units that handle different brightness ranges, the system manages processing complexity through functional segmentation while achieving coordinated brightness reduction across the entire video signal.
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 prevents burn-in while maintaining image contrast and three-dimensional effects, thereby extending the lifespan of the display device and enhancing image quality.
Implementation Method 1
The organic EL device changes from a ground state to an excited state when energy is received by electrolysis and emits energy of a difference as light when the ground state is returned from the excited state
Data Source
AI summary
Provided is a display device including a panel (158) in which a plurality of pixels that emit light in response to a video signal are arranged, a light emission amount calculation unit (164) that acquires a light emission amount on a plurality of positions of the panel (158) based on a video signal supplied to the panel (158), a storage unit (150) that accumulates data related to the light emission amount accumulated based on a video signal of a plurality of frames, a high-brightness gamma adjustment block (172b) that reduces brightness of a high brightness side of the video signal supplied to the panel (158) based on the data related to the light emission amount accumulated in storage unit (150), and a low-gradation gamma adjustment block (172c) that reduces brightness of a low brightness side of the video signal in conjunction with a reduction in brightness of the high brightness side.