OLED Subpixel Structure with White and Basic Subpixels
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Solution Overview
Problem
Conventional organic light-emitting devices (OLEDs) face high power consumption and high production costs due to inefficient subpixel arrangements and the need for multiple color filters, which also lead to energy loss and increased manufacturing complexity.
Innovation Solution
The proposed OLED device uses a substrate with a light-emitting layer comprising primary pixels, each consisting of three subpixels, including a white subpixel and basic subpixels with original and synthesized color zones, where the light-emitting materials are layered or mixed to synthesize white light, reducing the need for additional filters and simplifying mask production by forming four pixels with four apertures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If three primary subpixels (RGB) are arranged to obtain white background color, then the display device achieves full colors and wide view angles, but the power consumption increases significantly
Solution Approach 1:
The pixel is segmented into multiple subpixels with different functions: one white subpixel for background and three basic subpixels (RGB) for color synthesis. This segmentation allows the white subpixel to provide background illumination without requiring all color subpixels to be active simultaneously, thereby reducing power consumption while maintaining display quality.
Solution Approach 2:
Different subpixels are assigned different light-emitting materials with specific local functions: the white subpixel uses white light-emitting material for background, while basic subpixels use colored light-emitting materials for color synthesis. This local quality differentiation optimizes power consumption by activating only the necessary subpixels for each display scenario.
2Use of energy by moving object
If four white subpixels are arranged with white light in one pixel zone, then white light is obtained without lighting RGB color subpixels, but color filters are needed which cause energy loss
Solution Approach 1:
The invention extracts the color filtering function from separate filter films and integrates it directly into the light-emitting layer through color-matching layers. This eliminates the need for external color filters that cause energy loss, as the color synthesis occurs at the emission source itself through selective light-emitting materials.
Solution Approach 2:
Color-matching layers serve as intermediaries between the white light-emitting material and the final color output. These layers selectively absorb and re-emit light at specific wavelengths, enabling color synthesis without the energy loss associated with traditional subtractive color filtering.
3Ease of manufacture
If WRGB subpixels are arranged independently without color filters, then no color filters are needed, but each subpixel requires an independent mask which increases production cost
Solution Approach 1:
The invention merges the mask patterns for multiple subpixels into a single integrated mask structure. Instead of requiring separate masks for each WRGB subpixel, the design allows four subpixels to be formed using one mask with four apertures, significantly reducing the number of masking steps and associated production costs.
Solution Approach 2:
A single mask serves multiple functions by containing apertures for all four subpixels (white and three basic color subpixels). This universal mask eliminates the need for multiple specialized masks, simplifying the manufacturing process while maintaining the ability to independently define each subpixel region.
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 image brightness and color, reduces power consumption, extends the device's lifespan, and lowers production costs by eliminating the need for multiple masks and filters, while maintaining efficient light emission.
Implementation Method 1
two or more of the basic subpixels comprising an original color zone and a synthesized color zone; the light-emitting material for the synthesized white light corresponding to the synthesized color zone of two or more of the basic subpixels and another kind of light-emitting material for the synthesized white light being layered or mixed to form the subpixel with the white light
Data Source
AI summary
An organic light-emitting device includes a substrate, a first electrode layer, a light-emitting layer, and a second electrode arranged in layers. The light-emitting layer includes primary pixels, each of which includes three or more subpixels. One of the subpixels is a white subpixel. The other subpixels includes a basic subpixel which has a light-emitting material necessary to synthesize the white light. The basic subpixels includes an original color zone and a synthesized color zone. The light-emitting material for the synthesized white light corresponding to the synthesized color zone of the basic subpixels and another kind of light-emitting material for the synthesized white light are layered or mixed to form the subpixel with the white light. The brightness and color of the image is enhanced, power consumes less, and the life span of the organic light-emitting device is extended.