Subpixel Reflective Block Layout for OLED Light Leakage Control
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Solution Overview
Problem
Current OLED display technologies face challenges in efficiently managing light emission and reflection within subpixels, leading to potential light leakage and reduced display efficiency.
Innovation Solution
The display panel incorporates a design with light blocking and transmissive regions, featuring first and second reflective blocks on opposing substrates to direct light emission from light emitting elements into the transmissive region, while using black matrix blocks and diffusers to control and diffuse light, thereby preventing leakage and enhancing image display.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If light emitting elements are placed in subpixels without reflective blocks, then the structure is simple, but light leakage occurs and display efficiency is reduced
Solution Approach 1:
The subpixel is divided into distinct functional regions: a light blocking region containing the light emitting element and reflective blocks, and a light transmissive region surrounding it. This segmentation allows light to be directed specifically into the transmissive region while preventing leakage into adjacent areas, thereby improving light utilization efficiency without requiring complete structural redesign of the entire display panel.
Solution Approach 2:
Reflective blocks are introduced as vertical structures extending from the substrate upward within the light blocking region. These three-dimensional reflective elements redirect light that would otherwise leak laterally, bouncing it into the light transmissive region. This vertical dimension approach effectively controls light propagation without increasing the horizontal footprint or complicating the planar layout.
2Productivity
If reflective blocks are added to direct light emission, then light utilization is enhanced, but the device structure becomes more complex
Solution Approach 1:
Reflective blocks are strategically positioned only within the light blocking region of each subpixel, specifically surrounding the light emitting element. The light transmissive region maintains its transparency without additional structures. This localized application of reflective blocks ensures that light redirection occurs precisely where needed while preserving the simplicity and light transmission properties of the surrounding regions.
3Loss of energy
If light blocking regions are used to prevent light leakage, then light control is improved, but the aperture ratio decreases
Solution Approach 1:
The light blocking region, which initially appears to be a wasted area reducing the aperture ratio, is transformed into a functional light management zone. By introducing reflective blocks within this region, light that would otherwise be lost is redirected into the light transmissive region. This converts the previously harmful light leakage into beneficial light output, allowing the light blocking region to contribute positively to display efficiency without requiring an increase in the overall aperture ratio.
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 effectively prevents light leakage, enhances light utilization, and increases the aperture ratio, resulting in improved display efficiency and resolution.
Implementation Method 1
the first reflective block and the second reflective block are configured to reflect light emitted from the first light emitting element to the light transmissive region
Data Source
Figure 1A
Figure 1B~1D
Figure 2~3A
AI summary
The present application describes a display panel having a plurality of subpixels (Sp). Each of the plurality of subpixels (Sp) has a light blocking region (A) and a light transmissive region (B) surrounding the light blocking region (A). Each of the plurality of subpixels (Sp) in the light blocking region (A) includes a first base substrate (10) and a second base substrate (50) facing each other, a first light emitting element (40) and a first reflective block (30) on a side of the first base substrate (10) proximal to the second base substrate (50), and a second reflective block (70) on a side of the second base substrate (50) proximal to the first base substrate (10). The first reflective block (30) and the second reflective block (70) are configured to reflect light emitted from the first light emitting element (40) to the light transmissive region (B) thereby displaying an image.