Projection Display Segmentation for Leaked Light Suppression
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Solution Overview
Problem
Existing display devices face a reduction in dynamic range due to leaked light from color modulation elements, which affects the contrast and color accuracy, especially when displaying high dynamic range (HDR) content.
Innovation Solution
A display device configuration that includes a projection unit emitting linearly polarized light, a transmissive liquid crystal panel, and a polarizing plate, where the light is modulated based on separate picture signals for each color channel, and the components are arranged to minimize the impact of leaked light, enhancing contrast and dynamic range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a Y projection display device modulates luminance of light including RGB components, then high contrast display is achieved, but the dynamic range decreases due to leaked light from modulation elements
Solution Approach 1:
The invention divides the display system into two independent projection devices: one dedicated to RGB color modulation and another dedicated to luminance modulation. This segmentation prevents leaked light from one system from affecting the other, thereby maintaining both high contrast and wide dynamic range simultaneously.
Solution Approach 2:
The invention introduces a beam splitter as an intermediary component that separates and combines light paths from two independent projection devices. This intermediary allows the RGB projection and luminance projection to operate independently while delivering their combined effect to the display screen, resolving the conflict between contrast and dynamic range.
2Manufacturing precision
If leaked light from G and B modulation elements enters the Y projection display device, then the dynamic range becomes narrow, but the device complexity increases
Solution Approach 1:
By segmenting the projection system into two independent devices with separate optical paths, the invention eliminates the need for complex filtering and isolation mechanisms that would be required to prevent leaked light interference in a single integrated system.
Solution Approach 2:
The invention uses two separate projection devices that each independently create their respective images (RGB and luminance), which are then combined optically. This copying approach avoids the complexity of trying to manage light interference within a single device architecture.
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 configuration effectively suppresses the influence of leaked light, thereby expanding the dynamic range and maintaining high contrast, especially for HDR content, while also reducing the risk of moiré patterns and simplifying alignment between projection and liquid crystal panel.
Implementation Method 1
a polarizing plate emitting light that is included in the incident light and that has a predetermined polarizing direction
Implementation Method 2
a transmissive liquid crystal panel modulating incident light depending on a second picture signal, and then emitting the light
Data Source
AI summary
A display device includes: a projection unit that emits light depending on a first picture signal, the first picture signal including three primary color signals; a display unit that includes a screen, a transmissive liquid crystal panel, and a polarizing plate, the transmissive liquid crystal panel changing a polarizing direction of each of three primary color lights from the projection unit, depending on a second picture signal including three primary color signals; and a display control unit that generates the first picture signal and the second picture signal from an input picture signal including three primary color signals, and that outputs a picture signal for controlling the projection unit based on the first picture signal and controlling the transmissive liquid crystal panel based on the second picture signal.