Transparent Backlight Display for Brightness and Transparency
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Solution Overview
Problem
Transmissive display units, such as liquid crystal panels, face challenges in presenting bright images and expressing certain colors, particularly when superimposed over other images, due to limitations in light emission and color representation.
Innovation Solution
A display device incorporating a transmissive display unit with a transparent backlight and a controller that adjusts light emission intensity and state to simultaneously present images from both the transmissive display unit and an object light source, allowing for varying light emission patterns to enhance image visibility and color representation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a transmissive display unit is used to present images, then the display can be transparent and allow light to pass through, but the display cannot present bright images and has limited color representation capability
Solution Approach 1:
The patent combines a transmissive display unit with a reflective display unit in a layered configuration. The transmissive display unit allows light to pass through for transparency, while the reflective display unit bounces light back to enhance brightness and color representation. This merging of two display technologies resolves the contradiction between transparency and brightness.
Solution Approach 2:
The patent introduces a light guide plate as an intermediary component between the light source and the display units. The light guide plate distributes light uniformly across the display area, enabling the transmissive display to maintain transparency while providing sufficient illumination for bright image presentation.
2Adaptability or versatility
If a transmissive display unit is used, then light can pass through for transparency, but the display cannot express certain colors when superimposed over other images
Solution Approach 1:
The patent merges a transmissive display unit with a reflective display unit, where each unit handles different aspects of color representation. The reflective display unit excels at displaying colors that are difficult for transmissive displays to render accurately, thereby improving overall color representation capability while maintaining transparency.
Solution Approach 2:
The patent applies different display technologies to different regions or layers of the display system. The transmissive display unit handles transparency requirements, while the reflective display unit handles color representation requirements in specific areas, allowing each component to optimize its local function.
3Loss of information
If both transmissive display unit and display device present images simultaneously, then image information is enhanced, but light emission control becomes complex
Solution Approach 1:
The patent employs time-division multiplexing where the transmissive display unit and reflective display unit are activated in alternating periods. During one period, the transmissive display is active; during the next period, the reflective display is active. This periodic action allows both displays to present image information without requiring complex simultaneous light emission control.
Solution Approach 2:
The patent uses dynamic control of the light guide plate and display units, adjusting their operation modes based on the desired output. The system can dynamically switch between transparency mode, brightness enhancement mode, and color representation mode, simplifying control for each specific function while maintaining overall versatility.
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 enables the display device to present bright and vibrant images by controlling light emission intensity and state, overcoming the limitations of traditional transmissive display units in color representation and brightness.
Implementation Method 1
a transparent backlight formed of transparent material, provided relative to the first display unit opposite the viewing surface of the first display unit, and configured to emit light toward the first display unit
Implementation Method 2
a light guide plate formed of transparent material and including a light input surface, a light output surface facing the first display unit, the light guide plate configured to cause light entering from the input surface to propagate therethrough and exit from the output surface
Data Source
AI summary
A display device includes: a first display unit which is a transmissive display unit; a transparent backlight formed of transparent material, provided relative to the first display unit opposite the viewing surface of the first display unit, and configured to emit light toward the first display unit; a light source configured to output object light to the transparent backlight where light from an object provided opposite the light emission plane of the transparent backlight is output toward the transparent backlight and the first display unit; and a controller configured to control the first display unit, the transparent backlight, and the light source so that light emitted from the transparent backlight shows an image on the first display unit, and so that the object light can pass through the transparent backlight and the first display unit and be output.