Display Pixel Color Filter Opening for Viewing Angle and Image Capture
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Solution Overview
Problem
Display devices face challenges in achieving high-definition image display with low power consumption while integrating image capturing and touch panel functions, and require improved viewing angle characteristics and image capturing performance.
Innovation Solution
Incorporating a light-emitting and light-receiving element with a color filter that transmits and blocks specific colors, and a light-blocking layer to control light incidence and emission angles, along with a functional layer to manage refractive indices, allowing for clear image capture and display.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a conventional display device structure is used, then the device can display images, but it cannot capture images clearly (no image capturing function)
Solution Approach 1:
The patent combines the light-emitting function and light-receiving function into a single pixel element. The light-emitting and light-receiving element serves dual purposes: displaying images when electrically stimulated and capturing images when light incident from above reaches the photoelectric conversion layer, eliminating the need for separate display and capture components
Solution Approach 2:
The pixel element is designed to perform multiple functions simultaneously. The same element that emits light for display also contains a photoelectric conversion layer for image capture, making the display device universally capable of both display and capture operations without requiring additional dedicated components
2Measurement precision
If the light-emitting and light-receiving region is large, then the pixel can capture more light, but the viewing angle characteristics deteriorate
Solution Approach 1:
The patent introduces a color filter with different transmission characteristics in different regions. The color filter has a first region that transmits light of the first color and a second region that transmits light of the second color, creating local optical quality variations that control light paths differently for display and capture functions
Solution Approach 2:
The patent utilizes the vertical dimension by positioning the light-emitting and light-receiving region at a lower position than the color filter. This spatial arrangement in the vertical dimension allows light to pass through the color filter from above while maintaining distinct optical paths for emission and reception functions
3Manufacturing precision
If the color filter covers the entire light-emitting and light-receiving region, then color purity is improved, but light reception capability deteriorates
Solution Approach 1:
The color filter is divided into multiple regions: a first region that transmits light of the first color, a second region that transmits light of the second color, and a third region that does not overlap with the light-emitting and light-receiving region. This segmentation allows different parts of the color filter to serve different optical functions
Solution Approach 2:
The patent introduces a light-blocking layer as an intermediary element positioned between the color filter and the light-emitting and light-receiving region. This light-blocking layer blocks light of the first color from reaching the photoelectric conversion layer while allowing light of the second color to pass through, mediating the optical interaction
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 a display device with enhanced viewing angle characteristics, high image capturing sensitivity, and multifunctionality, reducing component count and noise, while maintaining clear image quality and reduced power consumption.
Implementation Method 1
Light-emitting elements (also referred to as EL elements) utilizing an electroluminescence (hereinafter referred to as EL) phenomenon
Implementation Method 2
The color filter has a function of transmitting the light of the first color and a function of blocking the light of the second color
Implementation Method 3
a light-emitting and light-receiving element having a function of emitting light of the first color and a function of receiving light of the second color
Data Source
AI summary
A display device provided with an image capturing function is provided. A display device with both high viewing angle characteristics and high image capturing performance is provided. The display device includes a light-emitting and light-receiving element and a color filter. The light-emitting and light-receiving element includes a light-emitting and light-receiving region having a function of emitting light of the first color and a function of receiving light of the second color. The color filter is positioned over the light-emitting and light-receiving element and has a function of transmitting the light of the first color and a function of blocking the light of the second color. The color filter includes an opening portion. The light-emitting and light-receiving region includes a portion positioned in the inside of the opening portion in the plan view.