OLED Polarizer Segmentation for Light Transmittance
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Solution Overview
Problem
The light transmittance of displaying light in OLED display devices is low due to the sequential lamination of wave plates and polarizers with light absorption layers on the entire surface of the second substrate, leading to significant light loss and absorption.
Innovation Solution
A display device design where a polarizer with a light absorption layer, made of polyvinyl alcohol, is strategically placed on the outer side of the second substrate to cover only the metal patterns, minimizing the overlapping area with the pixel display zone, and optionally incorporating a wave plate to absorb external light reflections, thereby increasing light transmittance without compromising the display effect.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If wave plate and polarizer with light absorption layer are sequentially disposed and laminated on the whole surface of the second substrate, then external light reflection is reduced, but light transmittance of displaying light becomes very low
Solution Approach 1:
The patent divides the second substrate surface into different regions: a first region where the wave plate and polarizer with light absorption layer are disposed to block external light, and a second region where only the wave plate is disposed to maintain high light transmittance for displaying light. This segmentation allows different areas to have different optical properties, resolving the contradiction between blocking external light and maintaining display brightness.
Solution Approach 2:
The patent applies different optical component configurations to different regions of the second substrate. The first region has both wave plate and polarizer with light absorption layer for external light blocking, while the second region has only wave plate for high transmittance. This local differentiation optimizes both external light rejection and display light transmission in their respective areas.
2Object-affected harmful factors
If polarizer with light absorption layer fully covers the metal pattern, then external light influence is decreased, but overlapping area with pixel display zone increases causing light loss
Solution Approach 1:
The patent segments the polarizer with light absorption layer into two parts: a first polarizer that fully covers the metal pattern to block external light reflections, and a second polarizer that does not overlap with the pixel display zone to avoid absorbing displaying light. This segmentation ensures external light blocking while minimizing energy loss from display light absorption.
Solution Approach 2:
The patent applies the polarizer with light absorption layer selectively to specific regions where it is needed (overlapping metal patterns) while avoiding regions where it would cause harm (pixel display zones). This localized application optimizes the balance between external light rejection and display light preservation.
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 decreases the negative influence of external light on the display effect while enhancing light transmittance by controlling the area of the light absorption layer's overlap with the pixel display zone, resulting in higher light transmittance in the non-overlapped regions of the pixel display zone.
Implementation Method 1
a light absorption layer (for example, Polyvinyl Alcohol (PVA) layer) 16A are sequentially disposed and laminated on whole surface of a second substrate 13
Implementation Method 2
the wave plate comprises a λ/2-wave plate and a λ/4-wave plate. In this example, the external light is firstly converted into a vertical polarized light after passing through the vertical polarizer; then, the vertical polarized light is converted into a left circularly polarized light after passing through the λ/2-wave plate and the λ/4-wave plate
Data Source
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AI summary
The present invention discloses a display device and a method of manufacturing the display device to solve a problem in the prior art that the light transmittance of the displaying light in the display device is very low. In the present invention, the display device comprises a first substrate formed with at least one metal pattern thereon, a second substrate disposed opposite to the first substrate, and a polarizer provided on an outer side of the second substrate far away from the first substrate. An area of an overlapping region between the metal pattern and a pixel display zone is less than an area of the pixel display zone. The polarizer comprises a light absorption layer fully covering the at least one metal pattern. An area of an overlapping region between the light absorption layer of the polarizer and the pixel display zone is less than the area of the pixel display zone. In the present invention, it increases the light transmittance of the displaying light in the OLED display device.