Light Compensation Layer for OLED Viewing Angle
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Solution Overview
Problem
Organic light emitting display devices with a color filter on TFT structure suffer from narrow viewing angles due to color changes when the viewing angle is altered, and the fabrication process is hindered by the need for a vacuum deposition process and high operating voltage, which complicates the production of large-sized displays and increases costs.
Innovation Solution
An organic light emitting display device with a light compensation layer made of materials like SiNx or indium tin oxide, formed in a hydrogen-free atmosphere, is integrated to enhance viewing angles and prevent transistor deterioration, along with holes for discharging foreign substances during the vacuum cure process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a color filter layer is formed on TFT to implement various colors, then color display capability is improved, but viewing angle becomes narrow due to color changes
Solution Approach 1:
A light compensation layer is introduced as an intermediary component between the color filter layer and the pixel electrode. This layer compensates for the color shift that occurs at different viewing angles, thereby maintaining color accuracy and expanding the viewing angle while preserving the color filter's ability to display various colors
2Adaptability or versatility
If light compensation layer is formed using conventional materials, then viewing angle is improved, but transistor deteriorates due to hydrogen infiltration into channel layer
Solution Approach 1:
The light compensation layer is formed using materials and processes that create a hydrogen-free environment. Specifically, silicon nitride (SiNx) is deposited in a nitrogen atmosphere without hydrogen-containing gases, and ITO or IZO is used as alternative materials that do not introduce hydrogen to the transistor channel layer, thus preventing transistor deterioration while maintaining viewing angle improvement
3Manufacturing precision
If vacuum deposition process is used for fabrication, then manufacturing precision is improved, but device complexity increases and large-sized display fabrication becomes difficult
Solution Approach 1:
The fabrication process transitions from vacuum deposition to atmospheric pressure deposition methods. This parameter change in deposition conditions simplifies the fabrication process, eliminates the need for complex vacuum equipment, and enables the production of large-sized displays while maintaining adequate manufacturing precision through controlled deposition parameters
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 enhances viewing angle characteristics, prevents transistor degradation from hydrogen infiltration, and ensures efficient discharge of foreign substances, thereby improving the reliability and cost-effectiveness of large-sized organic light emitting display devices.
Implementation Method 1
a light compensation layer formed on the second insulating layer and made of a material containing no hydrogen
Implementation Method 2
a hole for discharging foreign substances is formed on the light compensation layer, thereby efficiently discharging foreign substances during the vacuum cure process
Data Source
AI summary
The present invention is to provide an organic light emitting display device for preventing a thin-film transistor from being deteriorated due to hydrogen when forming a light compensation layer configured to enhance viewing angle, and the organic light emitting display device may include a first substrate and a second substrate comprising a plurality of pixels; a thin-film transistor formed at each pixel of the first substrate; a color filter layer formed at each pixel; an insulating layer formed on the color filter layer; a light compensation layer formed on the insulating layer and made of a material containing no hydrogen; a pixel electrode formed on the light compensation layer of each pixel; an organic light emitting unit formed on the pixel electrode to emit light; and a common electrode formed on the organic light emitting unit.