Projection Display System Series Light Modulator Contrast
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Solution Overview
Problem
Current projection display systems suffer from low contrast, excessive light loss, and poor image quality due to the parallel connection of three light modulators, which leads to high costs without desired display effects, especially in high-end markets.
Innovation Solution
The system reconfigures light modulators by 'parallel connecting' two and then 'series connecting' them, allowing each color to be modulated by at least two modulators, thereby equalizing optical lengths and simplifying the optical path, reducing light loss, and enhancing contrast without increasing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If three LCDs are connected in parallel (3LCD system), then image flicker and low brightness problems are solved, but contrast remains the same as single LCD system and cost increases
Solution Approach 1:
The patent segments the light modulation function across three LCDs arranged in series, where each LCD processes a specific color component (red, green, blue) sequentially. This segmentation allows each LCD to specialize in one color wavelength range, improving contrast for that specific color while maintaining overall system functionality through the series arrangement.
Solution Approach 2:
The system uses periodic action by sequentially processing different color components through the three LCDs in series. Each LCD modulates its specific color wavelength range in a periodic sequence, allowing the system to achieve high contrast for each color component while maintaining continuous image output through the sequential processing cycle.
2Manufacturing precision
If one light passes through more lenses (longer optical path), then that light can be modulated, but light loss increases and image quality deteriorates
Solution Approach 1:
The patent applies local quality by optimizing the optical path for each color component individually. Each LCD is positioned and configured to handle its specific color wavelength range with an optimized optical path length, ensuring that no single color component undergoes excessive light loss while maintaining uniform image quality across all colors.
3Device complexity
If triangular prisms are jointed for light combining, then light paths can be merged, but coating is difficult and gaps cause light loss
Solution Approach 1:
The patent merges the light paths from the three LCDs using a light combining device that integrates the modulated color components into a single composite image beam. This merging occurs after each LCD has processed its specific color component, allowing the system to achieve high contrast for each color while combining them efficiently without the coating and gap problems of traditional prism arrangements.
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 significantly improves display contrast and image quality, achieving High-Dynamic Range (HDR) display effects while reducing design complexity and light loss, making it a cost-effective solution for high-end applications.
Implementation Method 1
a light emitting device configured to emit, in a time sequence, first light and second light having different colors
Implementation Method 2
a light splitting device configured to split the first light into first wavelength range light emitted along a first optical path and second wavelength range light emitted along a second optical path
Data Source
AI summary
A projection display system, including light emitting device, light splitting device, first, second and third light modulators. The light emitting device emits first light and second light in time sequence. The light splitting device splits the first and second light into first and second wavelength range light along first and second optical paths, respectively, and guides part of the second light along the first optical path. The first and second light modulators modulate the light along the first and second optical paths, respectively; the light modulated by the first and second light modulators is combined to obtain third light along third optical path. The third light modulator is in optical path between the light emitting device and the light splitting device and modulates the first and second light from the light emitting device; or the third light modulator is in the third optical path and modulates the third light.