Display Device Signal Processor for Enhanced Gradation Expression
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Solution Overview
Problem
Display devices struggle to achieve higher gradation expression beyond the limitations of their display panels due to the dependence of gradation expression on the panel's display gradation, which restricts the number of visible gradations in images.
Innovation Solution
A display device configuration that includes a signal processor to convert image signals with 8-bit depth gradation data into 9-bit depth signals for RGB and W sub-pixels, allowing for increased bit depth through arithmetic processing, enabling the display panel to express 511 levels of gradation by adjusting the gradation data and datum values.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the display panel uses conventional 8-bit depth gradation data, then the display device can operate with standard signal processing, but the gradation expression is limited to 256 levels
Solution Approach 1:
The patent changes the bit depth parameter from 8-bit to 9-bit through arithmetic processing. The signal processor adds 1 to the gradation datum of the fourth color (white pixel) when its gradation data matches the first, second, or third color's gradation data, effectively increasing the signal resolution to 512 levels and enabling finer gradation expression without requiring the display panel hardware to change.
Solution Approach 2:
The signal processor acts as an intermediary between the image signal input and the display panel output. It performs arithmetic processing on the gradation data, specifically adding 1 to the white pixel's gradation datum under certain conditions, thereby bridging the gap between standard 8-bit input signals and the enhanced 9-bit output required for superior gradation expression.
2Measurement precision
If the display panel's display gradation is increased, then higher gradation expression is achieved, but the hardware complexity and cost increase
Solution Approach 1:
The patent applies preliminary action by performing the bit depth enhancement arithmetic processing in advance, before the signal reaches the display panel. The signal processor pre-calculates the adjusted gradation data (adding 1 to white pixel values) so that the display panel receives already-optimized 9-bit signals, avoiding the need for the panel hardware itself to support higher bit depths.
Solution Approach 2:
The patent creates a copied or transformed version of the input signal with enhanced precision. Instead of modifying the physical display panel, it generates a new signal representation with 9-bit depth by copying the 8-bit input and applying arithmetic transformation, thereby achieving higher gradation expression through signal replication rather than hardware modification.
3Measurement precision
If the signal processor outputs signals with different gradation values for RGB and W pixels, then 511 levels of gradation are expressed, but the signal processing complexity increases
Solution Approach 1:
The patent applies local quality by treating different color channels differently in the signal processing. Specifically, it only modifies the gradation datum of the fourth color (white) pixels when their gradation data matches the red, green, or blue pixels, while leaving other pixels unchanged. This localized processing approach achieves enhanced gradation expression for white pixels without unnecessarily complicating the processing of all pixel types.
Solution Approach 2:
The patent uses partial action by applying the +1 adjustment only to specific cases where the white pixel's gradation data equals the red, green, or blue pixel's gradation data. This selective processing rather than universal processing reduces the computational burden while still achieving the goal of 511-level gradation expression for the affected pixels.
Data Source
AI summary
A display device includes: a display panel including pixels for displaying a first color, a second color, a third color, and a fourth color; and a signal processor configured to convert an image signal including gradation data of the first to third colors into a first signal including gradation data of the first to third colors and a second signal including a gradation datum of the fourth color and output the first and second signals. When the gradation data of the image signal have the same value, output signals from the signal processor include an output signal in which the gradation data of the first signal and the gradation datum of the second signal have the same value and an output signal in which the gradation data of the first signal and the gradation datum of the second signal have values different from each other by 1.