Per-Pixel Light Source Control for Display Image Consistency
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Solution Overview
Problem
Existing display systems face challenges in achieving consistent and high-quality images due to issues like radial distortion, non-uniform pixel spacing, and the need for precise control of multiple light sources, especially in large and curved screen formats, which affect color gamut and brightness.
Innovation Solution
An image processing system that controls both the image modulator and light sources on a per-pixel basis, using a combination of user inputs, sensor feedback, and advanced processing techniques to adjust LED brightness and color, thereby enhancing display quality and dynamic range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If multiple light sources are used to illuminate large display screens, then brightness and color gamut are improved, but control precision and image consistency deteriorate
Solution Approach 1:
The patent divides the display screen into multiple zones, each illuminated by dedicated light sources. This segmentation allows independent control of each light source to compensate for positional variations and maintain uniform image quality across the entire large screen, resolving the contradiction between using multiple bright light sources and maintaining image consistency.
Solution Approach 2:
The patent implements per-pixel or per-zone control of light source intensity and color characteristics. By adjusting local parameters of individual light sources based on their position and the required image properties, the system achieves both high brightness and consistent image quality across different areas of the display.
2Length of stationary object
If projection path is shortened to thin the display system, then device compactness is improved, but radial distortion and image deformation increase
Solution Approach 1:
The patent applies distortion correction algorithms that pre-warp the image data before projection. By calculating and applying the inverse distortion map in advance, the system compensates for the radial distortion caused by short projection paths, allowing compact design without sacrificing image geometric accuracy.
3Manufacturing precision
If per-pixel control of light sources is implemented, then image quality and color accuracy are improved, but device complexity increases
Solution Approach 1:
The patent employs a single integrated processing system that handles multiple functions: image rendering, color space conversion, distortion correction, and light source control. This multi-functional approach achieves per-pixel precision without proportionally increasing overall system complexity, as one unified controller performs what would otherwise require multiple separate systems.
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 system improves image consistency, expands color gamut, and increases dynamic range, effectively addressing issues of radial distortion and light source control, resulting in higher quality and more accurate color representation across the display.
Implementation Method 1
an image modulator illuminated by a combination of a traditional lamp and one or more white or colored LED arrays to produce display images
Implementation Method 2
Light Emitting Diodes (LEDs) may be made from a variety of materials and each may have their own 'color temperature' characteristics
Implementation Method 3
Projection displays have a projection path with associated additional properties. For example, projecting an image from a projector on a level below the middle of a flat screen results in an image which is narrower at the bottom than at the top in what is known as the 'Keystone' effect. Radial distortion occurs when an image pixel is displaced from its ideal position along a radial axis of the image.
Data Source
AI summary
Image processing enhances display quality by controlling both the image modulator and the light sources.The image processing system utilizes a combination of user inputs, system configuration, design information, sensor feedback, pixel modulation information, and lighting control information to characterize the display environment on a per pixel basis. This per pixel characterization information is combined with one or more frames of the incoming real time display data. The image processing system processes each incoming pixel and produces a modified corresponding output pixel. Each pixel of each frame is processed accordingly.The image processing system also produces control information for the light sources. The light source control information can control individual lamps, tubes or LEDs, or can control a block or subset of the light sources. The resulting display has improved image consistency, enhanced color gamut, higher dynamic range and is better able to portray high motion content.