Display Device Signal Processing for High Brightness Color Balance
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Solution Overview
Problem
Existing display devices face challenges in achieving high brightness due to differences in element characteristics among sub-pixels, leading to limited brightness and inability to display images with high brightness effectively.
Innovation Solution
A display device with a signal processing unit that generates output signals for sub-pixels based on an expansion coefficient, allowing the display of colors within an expanded color space where the brightness of at least one sub-pixel can exceed its maximum displayable brightness, thereby enhancing the display of high-brightness images.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the maximum brightness is limited to correspond to the maximum brightness of the third sub-pixel by providing a light shielding layer or adjusting an output in a circuit, then color balance is maintained, but the brightness is expanded only up to brightness lower than the brightness that can be actually expressed, so that an image having high brightness cannot be displayed appropriately
Solution Approach 1:
The patent changes the parameter of brightness limitation by introducing a brightness conversion unit that converts input signals based on the relationship between maximum brightness values of different sub-pixels. Instead of uniformly limiting all sub-pixels to the lowest maximum brightness (third sub-pixel), the system allows first and second sub-pixels to output at their higher maximum brightness levels while using conversion coefficients to maintain color balance. This resolves the contradiction by changing the brightness parameter handling from uniform limitation to differential conversion.
Solution Approach 2:
The patent introduces a brightness conversion unit as an intermediary component between the signal processing unit and the display panel. This intermediary unit calculates and applies conversion coefficients to adjust the output signals of first and second sub-pixels, allowing them to operate at higher brightness levels while maintaining color balance. The intermediary enables high brightness display without sacrificing color accuracy by mediating between the conflicting requirements.
2Reliability
If the brightness of the first sub-pixel and the second sub-pixel is limited to correspond to the maximum brightness of the third sub-pixel, then color balance is maintained, but the brightness expansion is restricted below the actual expressible brightness
Solution Approach 1:
The patent changes the brightness parameter management by implementing a brightness conversion unit that uses conversion coefficients to allow first and second sub-pixels to operate at their higher maximum brightness values. This parameter change enables brightness expansion up to the actual expressible capability of the display panel while maintaining color balance through mathematical conversion, thereby improving productivity in terms of brightness expansion without sacrificing color balance reliability.
3Illumination intensity
If an expanded color space is used where the upper limit value of brightness in displaying at least one of the first color and the second color is larger than the third sub-pixel maximum brightness, then high brightness images can be displayed, but the output signal must be carefully converted to maintain color accuracy
Solution Approach 1:
The patent introduces a brightness conversion unit as an intermediary that handles the complex signal processing required for expanded color space. This intermediary unit calculates conversion coefficients based on the relationship between maximum brightness values and applies these coefficients to adjust output signals. By centralizing the complex conversion logic in a dedicated intermediary unit, the system achieves high brightness display while managing signal processing complexity in a structured manner.
Solution Approach 2:
The patent manages the increased signal processing complexity by implementing systematic parameter changes through conversion coefficients. The brightness conversion unit establishes mathematical relationships between different sub-pixel brightness values and applies consistent conversion parameters across all pixels. This parameter-based approach simplifies the handling of expanded color space by reducing complex signal adjustments to systematic coefficient applications.
Data Source
AI summary
A display device includes: an image display panel including a plurality of pixels each including a first sub-pixel, a second sub-pixel, and a third sub-pixel that display a first color to a third color; and a signal processing unit. The signal processing unit stores an expanded color space, acquires an expansion coefficient for expanding a color displayed by the image display panel to a color that can be extended in the expanded color space, obtains output signals of the first sub-pixel to the third sub-pixel based on at least input signals of the first sub-pixel to the third sub-pixel and the expansion coefficient, and outputs the output signals to the first sub-pixel to the third sub-pixel. The expanded color space is a color space that can extend a color the brightness of which is higher than brightness in a standard color space.