LCD Panel Gray Data Insertion Prevents Image Sticking
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Solution Overview
Problem
Large-screen digital information displays (DID) used for commercial advertisements often experience image sticking due to prolonged usage, causing stress on liquid crystals and resulting in residual images, which is difficult to convert into new images.
Innovation Solution
An LCD apparatus and method that inserts gray data into pixels based on a predetermined pattern and frame period, balancing polarity to reduce stress on liquid crystals and prevent residual images, using a controlling unit to generate and apply gray data voltage or normal data voltage to pixels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If the DID is driven for a long time to display the same images, then the advertisement effectiveness is improved, but image sticking occurs causing residual images
Solution Approach 1:
The patent applies periodic action by inserting gray data into pixels at regular intervals (e.g., every 3rd frame or 4th frame) during normal image display. This periodic insertion of gray data prevents liquid crystal stress accumulation while maintaining advertisement display effectiveness, thereby resolving the contradiction between long display duration and image quality.
Solution Approach 2:
The patent changes the data parameter by inserting gray data (a specific data value) into selected pixels at certain frame intervals. This parameter change alters the electrical stress pattern on liquid crystals, preventing residual image formation while maintaining normal display functionality for extended periods.
2Reliability
If gray data is inserted into all pixels every frame, then residual images are prevented, but device complexity and processing load increase
Solution Approach 1:
The patent applies local quality by selectively inserting gray data into only certain pixels (e.g., every other pixel or pixels at specific positions) rather than all pixels. This localized approach maintains residual image prevention effectiveness while significantly reducing the complexity of the controlling unit and processing requirements.
Solution Approach 2:
The patent uses partial action by inserting gray data into a subset of pixels rather than all pixels in each frame. This partial insertion is sufficient to prevent residual images while reducing the computational and control complexity compared to universal pixel treatment.
3Reliability
If gray data is inserted frequently, then liquid crystal stress is reduced, but display performance and image quality deteriorate
Solution Approach 1:
The patent implements periodic action by inserting gray data at controlled intervals (e.g., every 3rd or 4th frame) rather than continuously. This periodic insertion reduces liquid crystal stress accumulation while minimizing interference with normal display performance and image quality.
Solution Approach 2:
The patent applies partial action by inserting gray data into only a portion of pixels at each interval rather than all pixels. This approach provides sufficient stress relief to prevent residual images while maintaining acceptable display precision and image quality.
Data Source
AI summary
A liquid crystal display (LCD) apparatus, an LCD driving apparatus, and a method for driving the LCD apparatus are provided. The LCD apparatus includes a panel; and a controlling unit which inserts gray data into at least one pixel included in a pixel group. Accordingly, the stress on a liquid crystal is reduced and thus a residual image is prevented from occurring on a screen.