Timing Controller Dithering Pattern Detection Response Time Compensation
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Solution Overview
Problem
High-resolution image signals in liquid crystal displays face challenges in achieving fast response times without deteriorating image quality, requiring larger memory and higher operating speeds in response time compensation circuits.
Innovation Solution
A timing controller with a dithering unit, image pattern detector, dithering selector, and response time compensator is used to reduce bit widths of image signals, detect image patterns, and compensate liquid crystal response times by generating a present image signal from differences between current and previous signals, preventing errors in encoding and decoding processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the resolution of the liquid crystal display is increased, then the image quality is improved, but the size of the image signal becomes large requiring larger capacity memory and higher operating speed DCC
Solution Approach 1:
The patent extracts and removes the dithering function from the high-resolution signal processing path. By detecting specific image patterns (such as gradient patterns) that are problematic for dithering, the system selectively disables dithering only when necessary, thereby maintaining image quality while avoiding the need for larger memory capacity and higher operating speed DCC circuits.
Solution Approach 2:
The patent implements dynamic control of the dithering function based on real-time image pattern detection. The dithering off signal is dynamically generated according to the detected image pattern, allowing the system to adaptively adjust dithering operation. This dynamic approach optimizes the balance between image quality and processing requirements without permanently increasing memory capacity or DCC operating speed.
2Quantity of substance
If dithering is applied to reduce bit widths, then memory requirements are reduced, but image quality may deteriorate due to encoding and decoding errors
Solution Approach 1:
The patent introduces an image pattern detector as an intermediary component between the dithering unit and the output. This detector acts as a mediator that monitors the image content and generates a dithering off signal when problematic patterns are detected. This intermediary mechanism prevents encoding and decoding errors from occurring in the first place, thereby maintaining image quality while still allowing dithering to reduce memory requirements for normal images.
Solution Approach 2:
The patent applies preliminary anti-action by detecting problematic image patterns before dithering processing occurs. By generating the dithering off signal in advance based on pattern detection, the system prevents encoding and decoding errors from occurring during the dithering process. This proactive approach maintains image quality while preserving the memory-reducing benefits of dithering for suitable images.
3Reliability
If the response time compensation is enhanced for high resolution, then the response time is compensated, but the device complexity and operating speed requirements increase
Solution Approach 1:
The patent extracts and removes unnecessary dithering operations from the response time compensation path by detecting problematic image patterns. By disabling dithering only when it would cause errors (rather than applying it universally), the system maintains effective response time compensation for high-resolution displays while reducing the complexity and operating speed requirements of the DCC circuit.
Data Source
AI summary
A timing controller for a display apparatus includes a dithering unit outputting a first signal in which bit widths of image signals are reduced, an image pattern detector detecting an image pattern of the image signals and outputting a dithering off signal corresponding to the detected image pattern, a dithering selector receiving the first signal and converts the first signal to a second signal in response to the dithering off signal, and a response time compensator generating a present image signal from the second signal and compensates a liquid crystal response time in accordance with a difference between the present image signal and a first previous image signal to output a data signal.