Liquid Crystal Display Device With Multi-Panel Gradation Correction
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Solution Overview
Problem
Conventional liquid crystal display devices face challenges in displaying images with a higher number of bits than the driving bits in each display panel, leading to limitations in gradation representation and accuracy.
Innovation Solution
A liquid crystal display device with multiple superimposed panels, where each panel displays an image based on input data, using gradation decision units and correction units to adjust output gradations according to specific characteristics, including a gradation inverting portion, to enhance gradation representation and accuracy beyond the number of driving bits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If multiple display panels are superimposed to improve contrast, then image contrast is improved, but the number of displayable gradations remains limited by the driving bit depth of each panel
Solution Approach 1:
The image data processing is segmented into multiple stages: first gradation decision for the front panel, second gradation decision for the rear panel, and correction processing. Each panel processes a portion of the gradation information, with the rear panel receiving corrected image data that compensates for the front panel's limited bit depth, thereby achieving higher effective gradation precision while maintaining contrast improvement.
Solution Approach 2:
The correction unit receives feedback from the first image data and adjusts the second image data accordingly. The correction value is calculated based on the difference between the target gradation and the actual output gradation from the front panel, creating a feedback loop that enables the rear panel to compensate for quantization errors and achieve higher effective bit depth.
2Adaptability or versatility
If image data is truncated to match driving bit depth, then compatibility with display panels is maintained, but gradation accuracy and displayable gradations are reduced
Solution Approach 1:
Different processing is applied to different portions of the image data pipeline. The front panel receives standard n-bit image data for compatibility, while the rear panel receives corrected image data with enhanced gradation precision. The correction unit applies localized adjustments to specific gradation values based on the front panel's actual output characteristics, maintaining compatibility while improving accuracy where needed.
Solution Approach 2:
The system combines n-bit image data from the front panel with corrected m-bit image data from the rear panel to create a composite display output. The correction unit generates composite image data that integrates information from both panels, effectively creating a display system with higher than n-bit precision by combining multiple data sources with different characteristics.
Data Source
AI summary
A liquid crystal display device comprises a first and second display panels that display a first image and a second image, respectively based on input image data of m bits, and are both driven by n bits, where n<m, a first gradation decision unit that decides an output gradation of n bits for the first display panel based on a first gradation characteristic, the output gradation of n bits for the first display panel and a second gradation decision unit that decides an output gradation of n bits based on a second gradation characteristic for the second display panel, the output gradation of n bits for the second display panel. At least one of the first and second gradation characteristics includes a gradation inverting portion, where the output gradation decreases when the input gradation rises.