Afterimage Compensation Circuit Using Block Deterioration Data
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Solution Overview
Problem
Display devices, particularly light-emitting display devices, suffer from afterimages when operated at low frequencies, which existing technologies have not effectively addressed.
Innovation Solution
A display device with an afterimage compensation circuit that includes a nonvolatile memory to accumulate deterioration data and a compensation unit to generate compensation image signals based on this data, along with a sampling unit and a volatile memory to store and process image signals, effectively reducing afterimages across varying frequency operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the display device operates at low frequencies to reduce power consumption, then energy efficiency is improved, but afterimage artifacts worsen
Solution Approach 1:
The patent applies preliminary action by accumulating deterioration data in advance during normal operation and using this pre-collected data to generate compensation images when the display operates at low frequencies. The nonvolatile memory stores deterioration information that is collected during active periods, which then compensates for afterimages during low-power modes without requiring real-time data collection.
Solution Approach 2:
The patent implements feedback by continuously monitoring and accumulating deterioration data from the display panel, then using this feedback information to generate compensation images that counteract the observed deterioration effects. The compensation image generation unit uses the accumulated deterioration data to create corrective images that are added to the displayed content, forming a closed-loop system that adapts to panel aging.
2Measurement precision
If deterioration data is accumulated for each block to improve compensation precision, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the display panel into multiple blocks and accumulating deterioration data separately for each block. This allows the system to track and compensate for local variations in panel deterioration rather than treating the entire panel uniformly. Each block's deterioration data is stored and processed independently, enabling precise localized compensation.
Solution Approach 2:
The patent uses partial action by sampling and accumulating deterioration data from representative regions within each block rather than processing every single pixel. The compensation unit generates compensation images based on this sampled deterioration information, which is then applied across the entire block, reducing the computational burden while maintaining effective compensation.
Data Source
AI summary
A display device including: a display panel that includes a plurality of blocks, wherein pixels are arranged in each block; and an afterimage compensation circuit configured to receive input image signals and generate compensation image signals by compensating the input image signals based on deterioration information for each of the plurality of blocks, and wherein the afterimage compensation circuit includes: a nonvolatile memory including a first storage area where deterioration data for each of the plurality of blocks is accumulated at each of a plurality of backup times in a preset backup period, and a second storage area where information about a final backup time among the backup times is stored; and a compensation unit configured to receive accumulated deterioration data stored in the first storage area as the deterioration information and to compensate the input image signals based on the accumulated deterioration data to generate the compensation image signals.