Signal Processing Circuit for Display Panel Deterioration Detection
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Solution Overview
Problem
Display devices with organic electroluminescent (EL) displays face reduced light emission luminance over time, leading to unevenness and burn-in, particularly at specific positions, which shortens the overall lifetime of the device due to differential deterioration of light-emitting devices.
Innovation Solution
A signal processing circuit that accumulates display history information to detect the degree of deterioration across a display panel divided into blocks, determining a 'rotation-recommended state' when a predetermined threshold is met, allowing for panel rotation to correct luminance and extend device lifetime.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If Vth compensation circuit is formed in pixels to suppress Vth variations, then luminance uniformity is improved, but device lifetime is shortened due to accelerated deterioration at specific positions
Solution Approach 1:
The patent accumulates display history information and detects deterioration degrees in advance before burn-in becomes visible. By performing preliminary detection and triggering panel rotation before the deterioration reaches a critical state, the system prevents irreversible damage while maintaining luminance uniformity through the Vth compensation circuit.
Solution Approach 2:
The patent introduces dynamic panel rotation based on accumulated deterioration data. The rotation operation dynamically redistributes the spatial distribution of deterioration across different display positions, preventing any single position from reaching critical deterioration levels while maintaining overall luminance uniformity through compensation circuits.
2Duration of action of stationary object
If display history information is accumulated and panel rotation is triggered, then device lifetime is prolonged, but device complexity increases due to additional detection and control circuits
Solution Approach 1:
The patent combines the deterioration detection function with the existing image signal processing circuit. The accumulation of display history information and detection of deterioration degrees are integrated into the signal processing pipeline, sharing hardware resources with existing imaging functions rather than adding completely separate detection systems.
Solution Approach 2:
The signal processing circuit performs multiple functions: it processes image signals for display, accumulates display history information, detects deterioration degrees, and triggers rotation operations. This multi-functional approach eliminates the need for separate dedicated circuits for each function, reducing overall device complexity while extending device lifetime.
Data Source
AI summary
A signal processing circuit includes an accumulator circuit that accumulates display history information regarding light-emitting devices, and a detection circuit that detects the degree of deterioration of a display panel by the accumulated display history information and detects a rotation-recommended state of the display panel on the basis of the degree of deterioration. In the case where the display panel is divided into a plurality of blocks each including the same number of pixel circuits, the detection circuit detects the degree of deterioration for each of the blocks, and if the number of the blocks whose degrees of deterioration are greater than or equal to a first threshold value determined in advance is greater than or equal to a predetermined number, detects that the display panel is in the rotation-recommended state.