Display Device Polarizing Plate Extinction Ratio Optimization
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Solution Overview
Problem
Current display devices face challenges in achieving high contrast and display quality due to limitations in luminance transmission, primarily caused by the extinction ratios of polarizing plates and depolarization in liquid crystal panels.
Innovation Solution
The configuration of a display device with specific extinction ratios for polarizing plates and liquid crystal panels, where the second polarizing plate from the outside has a lower extinction ratio than the others, enhances luminance transmission while maintaining high contrast by optimizing the arrangement of polarizing plates and liquid crystal panels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If all polarizing plates have high extinction ratios, then contrast is improved, but luminance transmission deteriorates
Solution Approach 1:
The patent applies local quality by differentiating the extinction ratios of polarizing plates based on their position. Specifically, the second polarizing plate from the outside has a lower extinction ratio than the other three plates. This localized differentiation allows the system to maintain high contrast where needed while improving luminance transmission through the specific placement of a plate with reduced extinction ratio, thereby resolving the contradiction between contrast and luminance transmission.
2Stability of the object's composition
If extinction ratios of polarizing plates are increased, then contrast is improved, but display quality deteriorates due to reduced luminance
Solution Approach 1:
The patent applies parameter changes by systematically varying the extinction ratio parameter across different polarizing plates. Instead of using uniform high extinction ratios, the invention specifies different extinction ratio values for different plates, with the second plate from the outside having a deliberately reduced extinction ratio. This parameter optimization balances contrast performance with luminance transmission, thereby improving overall display quality while maintaining high contrast.
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 results in a display device that achieves both high contrast and increased luminance, thereby improving overall display quality by adjusting the extinction ratios of polarizing plates and liquid crystal panels.
Implementation Method 1
the second polarizing plate from the outside has a lower extinction ratio than that of each of the other polarizing plates
Data Source
AI summary
According to one embodiment, in a display device a first panel includes a first polarizing plate, a second polarizing plate, and a first liquid crystal panel interposed between the first polarizing plate and the second polarizing plate, a second panel includes a third polarizing plate, a fourth polarizing plate, and a second liquid crystal panel interposed between the third polarizing plate and the fourth polarizing plat, and a polarizing plate, which is located second from a surface close to an illumination device and a surface closest to an observer, has an extinction ratio that is lower than that of each of the other polarizing plates.