Projector Transmission Reflection Element Light Leakage Control
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Solution Overview
Problem
Conventional projectors suffer from low contrast due to ambient light interference and light leakage from closed pixels, resulting in impure black displays.
Innovation Solution
A projector design incorporating a transmission and reflection element with electrochromic units that can switch between reflective and transmissive states, allowing for controlled projection and absorption of image light to prevent light leakage, thereby enhancing contrast.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional projectors use simple pixel structures, then device complexity is low, but picture contrast is poor due to light leakage from closed pixels
Solution Approach 1:
The patent divides the pixel structure into multiple functional layers: light-emitting pixels and light-absorbing pixels are spatially segmented within each sub-pixel region. The light-absorbing pixels are positioned at specific locations within the sub-pixel to selectively absorb light that leaks from the light-emitting pixels, thereby improving picture contrast without requiring complete redesign of the entire pixel structure.
Solution Approach 2:
The patent introduces light-absorbing pixels as intermediary elements between the light-emitting pixels and the display output. These light-absorbing pixels act as mediators that capture and absorb stray light from the light-emitting pixels, preventing it from reaching the viewer and degrading the contrast ratio. This intermediary layer solves the light leakage problem without directly modifying the light-emitting pixel structure.
2Manufacturing precision
If projectors increase light absorption to prevent light leakage, then picture contrast improves, but ambient light interference increases
Solution Approach 1:
The patent applies light-absorbing properties only to specific local regions within each sub-pixel rather than uniformly across the entire display. The light-absorbing pixels are strategically positioned only where light leakage occurs, while other regions maintain their light-transmitting properties. This localized approach improves contrast by absorbing stray light without excessively blocking ambient light, thus balancing picture quality with environmental light interference.
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 effectively increases picture contrast by ensuring pure black displays and improving the overall displaying effect by managing light leakage through controlled state switching of transmission and reflection units.
Implementation Method 1
the transmission and reflection unit comprises an electrochromic unit
Data Source
AI summary
Embodiments of the present disclosure provide a projector and a method of driving a projector. The projector includes an image source for generating an image light and a transmission and reflection element. The image light includes a bright-state region image light and a dark-state region image light. The transmission and reflection element includes transmission and reflection units. Each of the transmission and reflection units is configured to reflect the image light irradiated thereon when in a reflective state, and to transmit the image light irradiated thereon when in a transmissive state. The transmission and reflection element is configured to perform one of a transmission and a reflection on the bright-state region image light so that the bright-state region image light is projected and displayed, and perform the other on the dark-state region image light so that the dark-state region image light is not projected and displayed.