Multi-Color Light Source Backlight for Wide Color Gamut Displays
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Solution Overview
Problem
Current display apparatuses face challenges in broadening their color gamut and enhancing optical quality, as existing methods for enlarging color gamut, such as transforming color gamut signals, increase computational complexity and can cause image distortion, and multi-primary-color systems suffer from decreased transmittance due to thick color filters, leading to offset frame images.
Innovation Solution
A display apparatus with a backlight module and a display panel featuring sub-pixels for different colors, including a white sub-pixel, where light sources are time-divisionally enabled to allow blending lights to pass through the white sub-pixel, effectively expanding the color gamut without increasing computational complexity and maintaining image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If transforming color gamut signals is applied to enlarge the color gamut, then the color gamut is enlarged, but the computational complexity increases and chromatic aberration occurs
Solution Approach 1:
The display frame is divided into multiple sub-frames, with each sub-frame containing a specific color light source (red, green, blue) and corresponding sub-pixels. This segmentation allows the system to display different colors in different time slots without requiring complex real-time signal transformation, thereby enlarging the color gamut while reducing computational complexity.
Solution Approach 2:
The patent employs periodic activation of different color light sources in a cyclic manner (red-green-blue sequence) across multiple sub-frames. This periodic action enables the display to showcase a broader color gamut over time without requiring complex computational transformations, as each color is displayed in its optimal time slot.
2Measurement precision
If multi-primary-color system display panels include a color filter for filtering light, then the color purity is improved, but the thickness of the color filter causes the decrease of the transmittance
Solution Approach 1:
The patent extracts the color filtering function from the traditional color filter layer and relocates it to the backlight module by using separate color light sources (red, green, blue LEDs). This extraction eliminates the need for thick color filters in the display panel, thereby maintaining high color purity while significantly improving light transmittance and reducing frame image offset.
3Measurement precision
If multi-primary-color system display panels include a color filter for filtering light, then the color purity is improved, but the thickness of the color filter causes the offset of frame images
Solution Approach 1:
The patent extracts the color filtering function from the color filter layer and implements it through separate color light sources in the backlight module. This eliminates the need for thick color filters that cause frame image offset, thereby maintaining color purity while improving frame image alignment precision.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enables the display of a broader color gamut with higher saturation and distortionless images, surpassing the limitations of three-primary-color systems, while maintaining optical quality and avoiding the computational complexity associated with traditional methods.
Implementation Method 1
blending light of the first color and the second color passes through the white sub-pixel
Data Source
AI summary
A display apparatus including a plurality of pixels and a multi-color light source backlight module, and a driving method thereof are disclosed. Each pixel includes a first color sub-pixel, a second color sub-pixel, a third color sub-pixel, and a white sub-pixel. The backlight module includes a first color light source, a second color light source, and a third color light source. In a first sub-frame period, the first color light source and the second color light source are lightening; in a second sub-frame period, the second color light source and the third color light source are lightening; and in a third sub-frame period, the first color light source and the third color light source are lightening.