Circular Polarizing Plate Structure for Corner Light Leakage Suppression
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Solution Overview
Problem
In self-luminous display devices, particularly in high-temperature and humidity-changing environments, light leakage occurs at the corner portions, making them conspicuous in reflected images.
Innovation Solution
A circularly polarizing plate comprising a retardation layer, a first light-absorbing anisotropic layer, and a second light-absorbing anisotropic layer, without a support between layers, with specific thermal and dehumidification shrinkage forces, and aligned absorption axes, is used to suppress light leakage and conspicuousness in reflected images.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a circularly polarizing plate with conventional structure is used in high-temperature and humidity-changing environments, then the display device can control viewing angle and reduce glare, but light leakage occurs at corner portions making them conspicuous in reflected images
Solution Approach 1:
The patent applies parameter changes by controlling the thermal shrinkage force to 5 N/m or less and dehumidification shrinkage force to 30 N/m or less. These specific parameter thresholds prevent dimensional changes of the circularly polarizing plate under temperature and humidity variations, thereby eliminating light leakage at corner portions while maintaining glare reduction and viewing angle control functions
Solution Approach 2:
The patent employs composite materials by combining the circularly polarizing plate with specific adhesive materials that have controlled thermal and humidity expansion characteristics. This composite structure ensures that the overall assembly maintains dimensional stability under environmental variations, preventing corner light leakage while preserving the optical functions
2Length of moving object
If the circularly polarizing plate is made thinner to reduce overall device thickness, then the device becomes more compact, but manufacturing precision and alignment become more difficult
Solution Approach 1:
The patent introduces adhesive layers as intermediary elements between the circularly polarizing plate and other display components. These adhesive layers provide a buffer zone that accommodates minor dimensional variations and alignment tolerances, enabling precise alignment even when the overall device thickness is reduced. The adhesive acts as a mediator that absorbs manufacturing variations without compromising the final alignment precision
3Stability of the object's composition
If support layers are added between the retardation layer and light-absorbing anisotropic layers to improve structural stability, then the plate maintains better dimensional stability, but the device complexity and number of layers increases
Solution Approach 1:
The patent extracts and eliminates unnecessary support layers from the conventional structure. By achieving dimensional stability through controlled thermal and humidity shrinkage forces of the circularly polarizing plate itself and using adhesive layers strategically, the design removes redundant structural elements. This reduction in layers simplifies the device complexity while maintaining or even improving dimensional stability under environmental conditions
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 reduces light leakage and conspicuousness at corner portions in self-luminous display devices under varying temperature and humidity conditions.
Implementation Method 1
a first light-absorbing anisotropic layer; and a second light-absorbing anisotropic layer
Implementation Method 2
a retardation layer
Data Source
AI summary
A circularly polarizing plate capable of suppressing occurrence of light leakage at a corner portion in a display device and suppressing the corner portion from being conspicuous in a reflected image when the circularly polarizing plate is used in a self-luminous display device in a high-temperature and changing humidity environment; and a self-luminous display device. The circularly polarizing plate includes, in order, a retardation layer, and first and second light-absorbing anisotropic layers, where a support is not provided between any of the three layers; the first light-absorbing anisotropic layer has an absorption axis in a plane of the first light-absorbing anisotropic layer; an angle θ between a transmittance central axis of the second light-absorbing anisotropic layer and a normal direction to the second light-absorbing anisotropic layer surface is 0° or more and 45° or less; and a thermal shrinkage force of the circularly polarizing plate is 5 N/m or less.