Display Panel Microcavity Structure for HMD Color Balance
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Solution Overview
Problem
Conventional display devices struggle to achieve high resolution and balanced white spectrum expression, especially in head-mounted displays where the distance between the display surface and the viewer is short, due to limitations in color expression and luminance.
Innovation Solution
A display panel structure is developed with a reflective plate and a first electrode configuration that allows for white and color expression by using a white organic light-emitting stack between the first and second electrodes, along with a color compensation layer and filter units to selectively transmit wavelengths, enabling constructive interference for red, green, and blue light.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a conventional display structure is used in head-mounted devices, then the device can be compact, but the color expression and white spectrum balance are insufficient
Solution Approach 1:
The patent combines the white organic light-emitting stack with the color expression function by using a single stack that emits all three primary colors (red, green, blue) simultaneously. The reflective plate and color compensation layer are integrated into the same structure, eliminating the need for separate optical members for white and color expression.
Solution Approach 2:
The white organic light-emitting stack serves multiple functions: it provides white light emission, enables color expression through selective wavelength transmission, and achieves balanced spectrum output. The reflective plate also serves dual purposes by reflecting light to enhance luminance while maintaining the microcavity structure for color control.
2Length of moving object
If the distance between display surface and viewer is short, then the device is compact for head-mounted use, but high resolution and balanced white spectrum are difficult to achieve
Solution Approach 1:
The patent optimizes the thickness parameters of the white organic light-emitting stack and the distance between the reflective plate and the stack to create a microcavity structure. By adjusting these dimensional parameters, the device achieves constructive interference for red, green, and blue wavelengths, enabling balanced white spectrum expression at short viewing distances.
Solution Approach 2:
The patent introduces a vertical microcavity dimension between the reflective plate and the white organic light-emitting stack to control optical interference. This vertical dimension allows for precise wavelength control without increasing the horizontal footprint, maintaining compactness while achieving high resolution and spectrum balance.
3Illumination intensity
If separate optical members are used for white and color expression, then optical performance is improved, but manufacturing process becomes complex
Solution Approach 1:
The patent merges the white light generation and color expression functions into a single integrated structure. The white organic light-emitting stack, reflective plate, and color compensation layer work together as one system, eliminating the need for separate optical members and simplifying the manufacturing process.
Solution Approach 2:
The white organic light-emitting stack generates all three primary colors (red, green, blue) simultaneously through its emissive layers. The structure self-regulates the color balance through the microcavity effect and selective wavelength transmission, eliminating the need for additional optical components to adjust color expression.
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 configuration enhances color expression and luminance, allowing for high-resolution, balanced white spectrum display in head-mounted devices without the need for separate optical members, improving panel efficiency and simplifying the manufacturing process.
Implementation Method 1
a white organic light-emitting stack provided between the first electrode and the second electrode, the white organic light-emitting stack including emissive layers configured to emit at least different colors of light
Implementation Method 2
the filter unit being configured to selectively transmit some wavelengths of light, among light emitted through the white organic light-emitting stack
Implementation Method 3
enabling constructive interference for red, green, and blue light
Data Source
AI summary
Disclosed is a display panel configured such that, in a structure in which the distance between a display surface and a viewer is short, the structure between a reflective plate and a first electrode (an anode) is changed such that light having three or more color peak properties for all subpixels is transmitted through a second electrode (a cathode), whereby white expression as well as color expression is possible, and a head mounted display device including the same.