Color Filter Substrate Layout for Under-Screen Sensor Integration
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Liquid crystal display (LCD) screens face a limitation in achieving full-screen functionality due to the inability of optical sensors and displays to overlap in space, hindering their compatibility with extreme demand for full-screen integration.
Innovation Solution
A color filter substrate is designed with a first pixel area for micro light-emitting diode (LED) units and a second pixel area for liquid crystal display, allowing for seamless integration and enabling in-screen sensor functions by utilizing micro LED technology, which includes a base substrate, micro LED units, a color resist, and an encapsulation layer with high light transmittance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If LCD screens use traditional backlight structure, then the entire surface requires backlight, but optical sensor and optical display cannot overlap in space
Solution Approach 1:
The display screen is segmented into two distinct pixel areas: a first pixel area using micro LED units for active light emission, and a second pixel area using liquid crystal display with color resist for passive light modulation. This segmentation allows the optical sensor to be positioned in the first pixel area where light can pass through, enabling spatial overlap between sensor and display while maintaining distinct functional zones
Solution Approach 2:
The patent transitions from a two-dimensional planar arrangement to a three-dimensional stacked structure by placing micro LED units and color resist on opposite surfaces of the base substrate. The first surface contains micro LED units with light-transmitting areas, while the second surface contains color resist, allowing light to traverse through multiple layers and enabling the optical sensor to function beneath the display in the same spatial footprint
2Illumination intensity
If micro LED units are disposed on the base substrate, then active light emission is achieved, but the structure becomes more complex
Solution Approach 1:
The patent merges the micro LED display structure with the liquid crystal display structure by integrating both on a single base substrate. The micro LED units on the first surface and color resist on the second surface work together in a unified structure, sharing common substrates, encapsulation layers, and driving circuits, thereby reducing overall system complexity despite the advanced functionality
Solution Approach 2:
The base substrate serves multiple functions: it provides mechanical support for both micro LED units and color resist, acts as a platform for integrating driving circuits, and enables light transmission from the first surface through to the second surface. This multi-functional design reduces the need for separate components and simplifies the overall device architecture
3Illumination intensity
If color resist is disposed on the second surface, then color filtering is achieved, but light transmittance may be reduced
Solution Approach 1:
The color resist is applied selectively on the second surface of the base substrate in the second pixel area, while the first pixel area maintains high light transmittance for sensor operation. This local application of color filtering properties allows different regions of the display to have optimized characteristics: the first pixel area prioritizes light transmission for under-screen sensing, while the second pixel area provides color filtering for liquid crystal display functionality
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 solution enables ultra-full screen LCD displays and integrates in-screen sensors, overcoming the spatial overlap constraint and enhancing transparency, thus meeting the demand for full-screen functionality.
Implementation Method 1
a plurality of micro light-emitting diode (LED) units disposed on a first surface of the base substrate in the first pixel area
Implementation Method 2
an encapsulation layer covering the first surface, the micro LED units, and the light-transmitting areas... a light transmittance of the encapsulation layer is greater than or equal to 70%
Data Source
AI summary
A color filter substrate and a display panel including the same are provided. The color filter substrate includes a first pixel area and a second pixel area adjacent to the first pixel area, and further includes: a plurality of micro light-emitting diode (LED) units disposed on a first surface of the base substrate in the first pixel area, wherein there are a plurality of light-transmitting areas among the micro LED units; and a color resist disposed on a second surface of the base substrate in the second pixel area, wherein the first surface and the second surface are two opposite surfaces of the base substrate.