Data Compensation Circuit for Display Afterimage Reduction
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Solution Overview
Problem
Display devices experience momentary afterimages due to hysteresis in driving transistors, leading to visible luminance differences when pixels are driven with different gray scales in previous frames.
Innovation Solution
A data compensation circuit that includes a reference frame memory, an accumulated stress memory, a stress data generating block, a memory control block, and a compensating block. This circuit compares output image data with reference frame data to generate stress data, updates cumulative stress data, and generates afterimage compensation data to adjust input image data and reduce luminance differences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If driving transistors are used to control pixel luminance, then display functionality is achieved, but hysteresis causes momentary afterimages and luminance differences
Solution Approach 1:
The patent applies preliminary action by calculating and applying compensation values before the momentary afterimage becomes visually significant. The system continuously monitors pixel luminance values and preemptively adjusts driving currents to counteract expected hysteresis effects, thereby preventing rather than merely correcting afterimage artifacts.
Solution Approach 2:
The patent implements feedback mechanisms by continuously monitoring the luminance output of pixels and using this information to adjust subsequent driving currents. The system measures actual pixel responses and feeds this information back to the compensation calculation module, creating a closed-loop control system that dynamically corrects for transistor hysteresis effects.
2Object-generated harmful factors
If compensation calculations are performed for all pixels, then afterimage reduction is achieved, but processing complexity increases
Solution Approach 1:
The patent applies local quality by focusing compensation calculations only on pixels that exhibit significant hysteresis effects or are likely to produce visible afterimages. Rather than uniformly processing all pixels, the system identifies and targets specific regions or pixel types that require compensation, thereby reducing overall computational complexity while maintaining effective afterimage reduction.
Solution Approach 2:
The patent implements partial action by applying compensation to a subset of pixels rather than all pixels in the display. The system determines which pixels require compensation based on their current state, historical data, and expected visual impact, thereby performing only the necessary compensation calculations to achieve acceptable afterimage reduction without the full processing overhead of universal compensation.
Data Source
AI summary
A data compensation circuit includes a reference frame memory device which stores reference frame data, an accumulated stress memory device which stores cumulative stress data for each of pixels, a stress data generating block which compares output image data with the reference frame data to generate stress data for each of the pixels, a memory control block which adds the stress data to the cumulative stress data to update the cumulative stress data and a compensating block which generates the output image data by generating afterimage compensation data for each of the pixels based on the cumulative stress data and compensating input image data based on the afterimage compensation data.