TFT-Free OLED Projection Screen with Infrared Sensitizing Pixels
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Solution Overview
Problem
Current OLED TV manufacturing faces challenges in producing large-screen TVs over 100 inches due to the limitations of thin film transistor (TFT) backplanes and conventional projection displays suffer from poor image quality due to ambient light reflection, leading to high costs and sub-optimal viewing experiences.
Innovation Solution
A thin film transistor-less organic light-emitting diode-based projection display system that uses a sensitizing part to detect non-visible infrared light, activating OLED pixels to emit visible light, thereby projecting high-quality images without the need for a TFT backplane and minimizing ambient light interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If TFT backplane process is used for OLED manufacturing, then manufacturing precision and reliability are improved, but device complexity and manufacturing cost increase significantly for large screens
Solution Approach 1:
The patent removes the TFT backplane layer from the OLED structure, directly fabricating OLED pixels on a substrate without the intermediate TFT driving layer. This extraction eliminates the complex vacuum deposition processes and multi-layer TFT structure while maintaining OLED performance, directly resolving the contradiction between manufacturing precision and device complexity
Solution Approach 2:
The patent uses inkjet printing to deposit organic precursor materials that are then converted to functional OLED layers through thermal processing. This copying approach replicates the function of vacuum-deposited OLED layers using solution-based printing, achieving comparable precision with simpler, lower-cost equipment suitable for large-area fabrication
2Illumination intensity
If conventional projection screen is used to maximize light reflection, then illumination intensity is improved, but contrast ratio deteriorates due to ambient light reflection
Solution Approach 1:
The patent employs color filters and wavelength-selective reflective layers that reflect only the specific wavelengths corresponding to the projected image colors while absorbing or transmitting ambient light wavelengths. This selective color reflection maintains high image brightness while eliminating the harmful effect of ambient light reflection, achieving high contrast ratio in bright environments
Solution Approach 2:
The patent uses the ambient light environment not as a detrimental factor but as a beneficial reference for enhancing image perception. By designing the projection screen to selectively interact with different wavelengths, the system converts the presence of ambient light into an opportunity to demonstrate superior contrast performance through wavelength discrimination, turning the harmful ambient reflection into a showcase for advanced optical selectivity
3Area of stationary object
If large substrate size is used for 100-inch screens, then screen area is improved, but manufacturing cost increases due to limited mother-glass size
Solution Approach 1:
The patent divides the large-area OLED display into multiple independently fabricable modules or tiles that can be produced on standard-sized substrates using inkjet printing. These segmented modules are then assembled to form the complete large-screen display, enabling cost-effective manufacturing of 100-inch and larger screens by avoiding the need for expensive large-format vacuum deposition equipment and oversized mother-glass substrates
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
Enables the production of large, high-quality projection screens greater than 100 inches with improved contrast ratio and reduced costs, providing a superior viewing experience by eliminating the need for a TFT backplane and reducing ambient light reflection.
Implementation Method 1
each pixel having a sensitizing part configured to detect a presence of a non-visible medium indicative of a part of an image
Implementation Method 2
activate the at least one organic light-emitting diode to emit light
Data Source
AI summary
Methods, a display system and projection screen are described. The projection screen includes a substrate supporting a plurality of pixels. Each pixel has a sensitizing part communicating with at least one light source, the sensitizing part being configured to detect a presence of a non-visible medium indicative of a part of an image, and to activate the at least one light source to emit light. The pixels having a first electrode and a second electrode configured to supply electricity to the sensitizing part and the light source.