Region-Specific Solid-State Light Source Control for Image Display Devices
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Solution Overview
Problem
Existing image display devices using electro-optic modulators, such as liquid crystal displays, suffer from blurred tailed-images due to slow response times, leading to reduced dynamism and uneven brightness, and existing solutions like intermittent lighting or scroll-based methods face challenges with luminance irregularities and accuracy in lighting control.
Innovation Solution
The implementation of solid-state light sources, divided into regions, with independent lighting control to match the writing of image data, allowing for instantaneous ON/OFF operations and fine-tuned lighting, along with diffusing plates or rod integrators to enhance homogeneity of brightness across and within regions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If lights are irradiated intermittently or scrolled region by region to prevent blurred tailed-images, then image sharpness is improved, but luminance becomes insufficient and dynamism is lost
Solution Approach 1:
The image forming region is divided into multiple regions, with separate light sources assigned to each region. This segmentation enables independent lighting control for each region, allowing the system to maintain high luminance while preventing blurred tailed-images through region-specific timing control.
Solution Approach 2:
The lighting control is made dynamic by adjusting the timing and duration of light irradiation for each region based on image data writing timing. The light sources are turned on and off dynamically synchronized with the writing process, achieving both sharp images and adequate luminance.
2Illumination intensity
If backlight luminance is increased to solve insufficient luminance, then luminance becomes sufficient, but the entire screen becomes whitish for low luminance scenes
Solution Approach 1:
Different lighting control strategies are applied to different regions based on local requirements. Each region's light source is controlled independently according to the image data being written to that specific region, enabling precise local optimization of both luminance and image quality without affecting the entire screen uniformly.
3Manufacturing precision
If discharge lamps are provided for each region and lit in sync with writing timing, then blurred tailed-images are prevented, but lighting ON/OFF operations cannot be performed instantaneously and fine-tuned control is difficult
Solution Approach 1:
The patent replaces discharge lamps with solid-state light sources that can be turned on and off instantaneously. This substitution enables precise timing control and instantaneous response to writing timing, overcoming the limitations of discharge lamp response time and allowing fine-tuned lighting control.
4Manufacturing precision
If a shutter is provided on the optical path to control limited time display, then blurred tailed-images are prevented, but device complexity increases
Solution Approach 1:
The patent extracts and removes the mechanical shutter mechanism from the system. Instead of using a physical shutter to control light timing, the invention directly controls the solid-state light sources themselves, turning them on and off electronically synchronized with writing timing. This eliminates the need for complex mechanical shutter components while achieving the same timing control function.
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 effectively prevents blurred tailed-images, achieves high-quality, sharp moving images with uniform brightness, and reduces luminance and color irregularities, enhancing the overall image display quality.
Implementation Method 1
solid-state light sources to correspond to the respective regions
Implementation Method 2
diffusing plates or rod integrators to enhance homogeneity of brightness
Implementation Method 3
rod integrators to enhance homogeneity of brightness
Data Source
AI summary
Aspects of the invention can provide an image display device that can include light sources provided, respectively, for regions obtained by dividing an image forming region of an electro-optic modulator into plural regions to irradiate corresponding regions, and a light source control portion that performs lighting control on the light sources. The light source control portion can perform the lighting control on the light sources for the respective region independently in sync with writing of image data to the electro-optic modulator, and the lighting control can be performed in such a manner that the light source corresponding to at least one region among the plural regions is kept unlit in a writing period for a screenful of image data.