OLED Display Spacers Dispersing Ambient Light
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Solution Overview
Problem
Organic light emitting diode (OLED) displays experience reduced visibility and contrast in bright environments due to ambient light reflection from hole injection electrodes, electron injection electrodes, and metal wires, leading to loss of emitted light.
Innovation Solution
The OLED display incorporates a substrate with pixel electrodes, spacers, organic emission layers, and color filters, where spacers are shaped to disperse ambient light and are integrally formed with the pixel defining layer, and the common electrode has a laminate structure with specific metals to minimize light loss and reflection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If hole injection electrodes, electron injection electrodes, and metal wires are used in OLED display, then electrical conductivity and device functionality are improved, but ambient light reflection increases causing reduced visibility and contrast
Solution Approach 1:
The patent applies this principle by using the reflective properties of metal electrodes and wires not as a drawback but as a functional feature. The spacers are strategically positioned to reflect ambient light away from the display viewing area, converting the harmful reflection into a beneficial light-directed function that improves visibility while maintaining the necessary metallic components for device operation
2Object-affected harmful factors
If spacers are added to disperse ambient light, then visibility and contrast are improved, but device complexity increases
Solution Approach 1:
The spacers in the patent serve multiple functions simultaneously: they maintain the physical separation between display layers, provide structural support, and function as optical elements to disperse and redirect ambient light. This multi-functionality reduces the need for separate dedicated anti-reflection components, thereby limiting the increase in device complexity while achieving improved visibility
3Loss of energy
If color filters are formed on the common electrode in openings of pixel defining layer, then light emission efficiency is maximized, but manufacturing precision requirements increase
Solution Approach 1:
The pixel defining layer is formed first with its openings precisely positioned, establishing a pre-defined template or guide structure. The color filters are then formed within these pre-established openings, which preliminary defines their exact locations. This preliminary action of creating the pixel defining layer pattern first simplifies the subsequent color filter deposition process and reduces the overall manufacturing precision requirements compared to directly patterning color filters without guidance
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 visibility and contrast by reducing ambient light reflection, maximizing light emission efficiency and eliminating the need for a polarizing member, thereby improving luminance and lifespan.
Implementation Method 1
Light is produced when excitons, generated by combination of holes and electrons in the organic emission layer, transit from an excited state to a ground state
Implementation Method 2
spacers are shaped to disperse ambient light
Data Source
AI summary
An organic light emitting diode display including: a substrate; pixel electrodes formed on the substrate; a pixel defining layer having openings exposing the plurality of pixel electrodes, formed on the substrate; spacers formed on the pixel defining layer; organic emission layers formed on the pixel electrodes; a common electrode formed on the organic emission layers; and color filters formed on the common electrode, in the openings of the pixel defining layer.