Display Apparatus Expanding Color Gamut via Dual Light Sources
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Solution Overview
Problem
Current display devices face limitations in achieving a wide color gamut due to narrow color gamut coverage, high cost, and issues like speckle caused by laser light coherence, as well as inefficiencies in semiconductor green laser technology, which restrict their ability to display realistic and bright images.
Innovation Solution
A display apparatus that includes a light source device emitting first and second lights, where the first light is modulated to form images within a first color gamut range and the second light extends this range, along with an image data processing module that converts original image data into corrected control signal values for both lights, allowing for a wider color gamut display.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If three primary colors of R, G, and B are used to reproduce colors, then the display device can display images, but the color gamut area is limited and cannot achieve wide color gamut
Solution Approach 1:
The patent combines multiple light sources (first light source with first light and second light source with second light) to work together and expand the color gamut. The first and second lights are combined through optical systems to display a wider color range than a single light source could achieve alone, resolving the contradiction between color gamut area and device complexity.
Solution Approach 2:
The patent introduces a new dimension to color reproduction by adding the second light source with different spectral characteristics. This extends the color gamut beyond the traditional three-primary-color triangle in chromaticity space, allowing display of colors outside the conventional RGB gamut while maintaining manageable system complexity through structured integration.
2Adaptability or versatility
If laser light is used to achieve wide color gamut, then color representation is improved, but speckle is caused by laser light coherence
Solution Approach 1:
The patent introduces an intermediary optical system including beam combiners and spatial light modulators that process the laser light. These intermediaries break up the coherent speckle pattern while preserving the wide color gamut benefits, allowing the system to achieve both improved color representation and reduced harmful speckle effects.
3Ease of manufacture
If semiconductor green laser is used, then cost is reduced, but efficiency is low and color gamut is limited
Solution Approach 1:
The patent merges multiple light sources with different characteristics, including semiconductor lasers and other light sources, to achieve both cost-effectiveness and high efficiency. By combining the advantages of different light sources, the system overcomes the limitations of any single source, including the low efficiency and limited color gamut of semiconductor green lasers alone.
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
The solution enables a wider color gamut and better display effects by accurately restoring images with reduced usage of secondary light sources, thereby minimizing costs and overcoming previous limitations in color representation.
Implementation Method 1
a light source device configured to emit first light and second light
Implementation Method 2
a first spatial light modulator configured to generate first image light by modulating the corresponding color light in the first light and the second light based on k corrected control values
Data Source
AI summary
A display apparatus comprising a light source device, an image data processing module, a light modulation device, and an image synthesizing device. The light source device is configured to emit first light and second light. The image data processing module is configured to receive original image data of an image to be displayed, the original image data of the image to be displayed being image data based on a second color gamut range and comprising original control signal values of m colors of pixels, and the second color gamut range covers a first color gamut range and has a portion beyond the first color gamut range. The image data processing module further maps the original control signal values as m corrected control signal values and n control signal values.