Display Signal Processor Coupling Index Compensation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Display devices, such as LCDs and OLEDs, suffer from ghosting and shading phenomena due to charging-type coupling between adjacent rows, leading to reduced image quality and blurring caused by insufficient charging rates and signal delays.
Innovation Solution
A display device with a signal processor that calculates a coupling index representing the degree of coupling between adjacent rows, using a three-dimensional lookup table to compensate for image signals and generate a compensated image signal by adjusting voltages based on the coupling index, thereby reducing ghosting and shading effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If data voltages are transferred to data lines and gate signals to gate lines to drive pixels, then the display device can show images, but charging-type coupling between adjacent rows causes ghosting and shading phenomena that degrade image quality
Solution Approach 1:
The patent applies preliminary action by calculating coupling indices between adjacent rows in advance and storing compensation values in lookup tables before actual image display. The signal controller pre-processes the relationship between adjacent rows, so that when ghosting or shading occurs, the compensation can be immediately applied without delay, effectively preventing the harmful effects while maintaining normal display operation
Solution Approach 2:
The patent implements feedback by calculating coupling indices that represent the degree of coupling between adjacent rows, using these indices to retrieve appropriate compensation values from lookup tables, and applying these compensation values to correct the image signals. This closed-loop approach continuously compensates for charging-type coupling effects, eliminating ghosting and shading phenomena while preserving the original display function
2Manufacturing precision
If signal processing is performed to compensate for coupling effects, then ghosting and shading are reduced, but the device complexity increases due to additional signal processor components
Solution Approach 1:
The patent applies dimensionality change by introducing a new parameter dimension - the coupling index - that quantifies the interaction between adjacent rows. By adding this dimensional parameter and corresponding lookup tables, the system transforms the complex coupling compensation problem into a manageable table-lookup operation, reducing computational complexity while improving image quality
Solution Approach 2:
The patent uses coupling indices and lookup tables as intermediaries between the raw image signals and the compensated output. Instead of directly complex signal processing, the coupling index serves as a mediator that simplifies the compensation process by pre-calculating and storing correction values, thereby reducing device complexity while achieving effective ghosting and shading elimination
Data Source
AI summary
A display device and a driving method thereof are disclosed. In one aspect, the display device includes a display panel including a plurality of pixels, a data driver transferring data voltages to a plurality of data lines, and a gate driver transferring gate signals to a plurality of gate lines. The display device also includes a signal controller controlling the data driver and the gate driver and including a signal processor. The signal processor includes a memory and a coupling index calculator calculating a coupling index which represents a coupling degree between adjacent rows. The signal processor compensates for the input image signal to generate a compensated image signal based at least in part on the coupling index.