Organic Light Emitting Display Compensation Memory Update Blocks
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Solution Overview
Problem
Existing external compensation methods for organic light emitting displays fail to account for deterioration over time and do not include error checking for abnormal power-off situations, leading to decreased image quality due to abnormal compensation data.
Innovation Solution
A memory system with first and second update blocks for sequentially storing compensation values, where a timing controller configures these blocks based on a preset check code to ensure only normal data is loaded and updated, preventing abnormal data from being stored and improving compensation accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If external compensation method is used to compensate for TFT electrical characteristic differences, then luminance uniformity is improved, but the method cannot cope with deterioration with the passage of driving time
Solution Approach 1:
The patent performs preliminary sensing of TFT electrical characteristics at the time of product shipment and stores the compensation data in non-volatile memory. This preliminary action establishes initial compensation values that can be maintained over the product's lifetime without requiring continuous updates, thus resolving the contradiction between achieving luminance uniformity and maintaining compensation validity over time.
Solution Approach 2:
The patent implements an automatic compensation system that uses the display panel's own sensing capabilities to measure TFT characteristics and generate compensation data without external intervention. The system serves itself by continuously monitoring and updating compensation values based on actual deterioration, eliminating the need for manual recalibration and maintaining compensation effectiveness throughout the product's operational life.
2Measurement precision
If compensation data is updated by sensing driving TFT deterioration after shipment, then compensation accuracy is improved, but abnormal power-off situations can cause incorrect compensation data to be stored
Solution Approach 1:
The patent performs preliminary actions by checking whether compensation data has been completely written to memory before considering the update successful. This preliminary verification step prevents abnormal compensation data from being stored in the memory, ensuring data integrity even during abnormal power-off situations while maintaining the ability to update compensation accuracy.
Solution Approach 2:
The patent implements a feedback mechanism that continuously monitors the compensation data writing process and verifies its completion before accepting the updated data. This feedback loop detects abnormal power-off conditions and prevents incorrect data from being stored, thereby maintaining both compensation accuracy and data integrity simultaneously.
3Ease of operation
If initial compensation data is stored in nonvolatile memory before product shipment, then compensation can be applied after shipment, but the method cannot update compensation data to account for deterioration over time
Solution Approach 1:
The patent transforms the static initial compensation data into dynamic, updatable compensation values. The system allows compensation data to be updated at regular intervals after shipment by sensing current TFT deterioration and recalculating compensation values. This dynamic approach maintains ease of operation through automatic updates while providing adaptability to account for temporal deterioration.
Solution Approach 2:
The patent ensures continuity of useful action by implementing regular interval updates of compensation data throughout the product's operational life. The system continuously monitors TFT characteristics and updates compensation values at scheduled intervals, maintaining compensation effectiveness over time without interrupting normal display operation, thus achieving both ease of operation and long-term adaptability.
Data Source
AI summary
An image quality compensation device for an organic light emitting display includes: a memory having first and second update blocks selectively storing first and second period compensation values, which are sequentially updated at regular intervals; and a timing controller that configures the first update block as either the current memory page for data loading or the next memory page for data writing and the second update block as the other one of the two, based on a preset check code, and updates the memory by calculating the second period compensation value with the passage of driving time based on the first period compensation value loaded from the update block configured as the current memory page, writing the second period compensation value to the update block configured as the next memory page, and then erasing the first period compensation value from the update block configured as the current memory page.