Reflective OLED Pixel Electrode Color Filter Visibility
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Solution Overview
Problem
Organic light emitting display apparatuses face reduced visibility due to the reflective nature of their pixel electrodes, which reflect external light, leading to decreased display quality.
Innovation Solution
A display panel design incorporating a first switching element, a reflective pixel electrode with a light emitting layer emitting a specific color, a thin encapsulation film, and a color filter corresponding to the light emitting layer, along with a pressure sensitive adhesive layer, to reduce external light reflectance and enhance visibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a reflective pixel electrode is used in an organic light emitting display apparatus, then the light emission efficiency is improved, but the visibility is reduced due to reflection of external light
Solution Approach 1:
A color filter layer is introduced as an intermediary component between the external environment and the pixel electrode. This color filter selectively transmits light of a specific wavelength corresponding to the emission color of the organic light emitting layer while blocking other wavelengths, thereby preventing external light reflection without affecting the desired light emission
Solution Approach 2:
The color filter is designed to have a specific color that corresponds to the emission wavelength of the organic light emitting layer. This color matching allows the filter to transmit the desired emission color while blocking other colors of external light, effectively reducing visibility issues caused by external light reflection
2Object-affected harmful factors
If a color filter is added to reduce external light reflectance, then the visibility is improved, but the device complexity increases
Solution Approach 1:
The color filter layer serves multiple functions simultaneously: it acts as a wavelength selector for the emission light, a protective layer for the organic light emitting layer, and a visibility enhancer by blocking external light reflection. This multi-functionality reduces the need for additional separate components
Solution Approach 2:
The color filter is integrated with the encapsulation structure of the OLED display. The filter is deposited or formed as part of the encapsulation layers that already protect the organic light emitting layer, combining the protective and optical filtering functions into a single integrated structure
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 solution effectively decreases external light reflectance on the pixel electrodes, thereby improving the display panel's visibility and quality by using a color filter that matches the light emitted by the light emitting layer, allowing only specific wavelengths of external light to pass through.
Implementation Method 1
a first color filter is disposed on the pressure sensitive adhesive layer. The first color filter corresponds to the first light emitting layer and has the first color
Implementation Method 2
the pixel electrode of the organic light emitting display apparatus is a reflective electrode for reflecting light
Data Source
AI summary
A display panel including a first switching element, a first pixel electrode electrically connected to the first switching element, the first pixel electrode including a reflective material. A first light emitting layer is disposed on the first pixel electrode, and emits light having a first color when a voltage is applied to the first pixel electrode. A thin encapsulation film is disposed on the first light emitting layer, and protects the first light emitting layer. A pressure sensitive adhesive layer is disposed on the thin encapsulation film, and a first color filter is disposed on the pressure sensitive adhesive layer, corresponding to the first light emitting layer, and has the first color.