Display Timing Controller Memory Segmentation for Compensation
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Solution Overview
Problem
Display devices, such as OLEDs and LCDs, face challenges in maintaining accurate compensation driving due to external factors like electrostatic discharge and physical impacts, which can damage data and hinder normal compensation processes.
Innovation Solution
A display device with a timing controller that includes a data compensator, non-volatile memory, and volatile memories, allowing for real-time compensation by reading reference compensation data, calculating and updating data for threshold voltage and mobility of driving transistors during blank times within a frame, thereby minimizing time delays and ensuring accurate image data compensation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If compensation data is stored in volatile memory for real-time compensation, then compensation speed is improved, but data reliability deteriorates due to potential damage from external factors like electrostatic discharge
Solution Approach 1:
The patent divides the memory system into two separate parts: volatile memory for storing compensation data during operation and non-volatile memory for storing reference data. This segmentation allows the system to maintain fast compensation using volatile memory while protecting against data loss through non-volatile memory, resolving the contradiction between speed and reliability.
Solution Approach 2:
The patent introduces a buffer memory as an intermediary between the volatile memory and non-volatile memory. The buffer memory temporarily stores compensation data read from non-volatile memory, allowing the volatile memory to be refilled without direct access to the non-volatile memory during critical operations, thus maintaining both speed and reliability.
2Measurement precision
If compensation data is updated continuously during active time, then compensation accuracy is improved, but processing time increases and image display is delayed
Solution Approach 1:
The patent performs compensation data updates during the blank time period before the next frame is displayed. By preparing and updating compensation data in advance during blank time, the system ensures high compensation accuracy for the upcoming active time without adding processing delays during the actual image display, thus resolving the contradiction between accuracy and time loss.
3Reliability
If reference compensation data is read from non-volatile memory during active time, then data reliability is improved, but processing speed decreases due to additional read operations
Solution Approach 1:
The patent reads reference compensation data from non-volatile memory during the blank time period and stores it in the buffer memory before the active time begins. This preliminary action ensures that when the active time starts, the reference data is already available in the buffer memory, allowing for fast processing without sacrificing reliability, thus resolving the contradiction between reliability and speed.
Data Source
AI summary
A display device may include: a display panel configured to be driven in an active time and a blank time within one frame and including pixels each having a driving transistor; a data driver configured to provide a first data voltage based on an image data to the pixels in the active time; and a timing controller configured to compensate for the image data based on a first compensation data for a threshold voltage of the driving transistor and a second compensation data for a mobility of the driving transistor, the timing controller including a data compensator, a non-volatile memory, and volatile memories. The timing controller may be further configured to read a reference first compensation data from the non-volatile memory in the active time and update the first compensation data and the second compensation data to be stored in one of the volatile memories in the blank time.