OLED Display Light Absorption Pattern for Reflection Reduction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Organic light emitting diode (OLED) displays suffer from poor visibility in bright areas due to external light reflection, which affects black color expression and contrast, leading to deteriorated visibility.
Innovation Solution
An OLED display with a light absorption pattern on a second display panel that partitions the emissive area into sub-emissive areas using a stripe or lattice pattern, formed with materials like titanium oxide, iron oxide, chromium, or silver, or organic materials with black particulates, to reduce external light reflection without requiring additional anti-reflection or polarizing layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a light absorption pattern is introduced to reduce external light reflection, then visibility is improved, but device complexity increases
Solution Approach 1:
The emissive area is divided into multiple sub-emissive areas by introducing light absorption patterns (stripes or lattice structures) that partition the continuous emitting region. This segmentation reduces the reflection of external light while maintaining the overall emissive function, resolving the contradiction between reducing harmful reflections and maintaining structural simplicity.
Solution Approach 2:
The light absorption pattern is applied locally within the emissive area rather than uniformly across the entire display. The pattern creates regions with different optical properties (light-absorbing stripes versus light-emitting spaces), allowing selective reduction of external light reflection in specific zones while preserving the emissive characteristics in other zones.
2Object-affected harmful factors
If the light absorption pattern partitions the emissive area into multiple sub-emissive areas, then visibility and luminance are enhanced, but the area available for light emission is reduced
Solution Approach 1:
The optical parameters of the display are optimized by controlling the width, spacing, and density of the light absorption pattern elements. By adjusting these parameters, the pattern achieves effective external light reflection reduction while minimizing the impact on the total emissive area, thus enhancing visibility without excessive loss of light-emitting space.
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 light absorption pattern effectively reduces external light reflection while maintaining high transmittance of emitted light, enhancing visibility and luminance without increasing the display's thickness or weight.
Implementation Method 1
a light absorption pattern which partitions the emissive area of the organic light emitting diode into four to ten sub-emissive areas
Implementation Method 2
The electrons and the holes are combined with each other in the organic emissive layer to thereby generate excitons. When the excitons shift from an excited state to a ground state, energy is generated, and light is emitted by way of the energy.
Data Source
Figure 1
Figure 2
Figure 3
AI summary
An organic light emitting diode (OLED) display is disclosed. In one embodiment, the OLED display includes i) a first display panel comprising a plurality of organic light emitting diodes (OLEDs), wherein an emissive area and a non-emissive area are formed for each of the OLEDs, wherein the emissive area is configured to emit light, and wherein the non-emissive area is configured not to emit light and ii) a second display panel facing the first display panel, wherein the second display panel comprises a light absorption pattern which partitions the emissive area of each OLED into a plurality of sub-emissive areas.