Display Wire Grid Polarizer Pitch Variation for Blue-Light Balance
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Solution Overview
Problem
Existing display devices for head-mounted displays face challenges in achieving high transmittance in the short-wavelength range and maintaining luminance balance, particularly in blue light emission, which affects the resolution and clarity of images.
Innovation Solution
A display device with a wire grid polarizer having varying grid pattern pitches for blue, green, and red pixels, along with a phase retardation layer and color filters, to enhance transmittance and luminance balance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a wire grid polarizer with uniform grid patterns is used across all pixels, then the manufacturing process is simple, but the transmittance in the short-wavelength range (blue light) is insufficient and luminance balance is poor
Solution Approach 1:
The patent applies local quality by varying the pitch of grid patterns in the wire grid polarizer according to the emission characteristics of different pixels. Specifically, pixels emitting short-wavelength light (blue) are assigned smaller grid pitches, while pixels emitting long-wavelength light (red) are assigned larger grid pitches. This localized adaptation optimizes transmittance for each wavelength range, improving overall luminance balance without requiring uniform complex structures across the entire display.
2Illumination intensity
If the grid pitch is reduced to improve blue light transmittance, then short-wavelength transmittance improves, but the manufacturing precision requirements increase
Solution Approach 1:
The patent employs parameter changes by systematically varying the grid pitch parameter across different pixel regions based on their emission wavelengths. Instead of using a single fixed pitch, the pitch is adjusted as a continuous or discrete parameter to match the spectral characteristics of each pixel type (blue, green, red). This approach optimizes optical performance while allowing manufacturing processes to work within feasible precision ranges for each local region.
3Illumination intensity
If different grid pitches are used for different color pixels, then luminance balance is improved, but the device structure becomes more complex
Solution Approach 1:
The wire grid polarizer is segmented into multiple regions, each corresponding to different pixel types (blue, green, red emission areas). Each segment is designed with appropriate grid pitch characteristics tailored to its associated pixel's emission wavelength. This segmentation allows the complex requirement of luminance balance to be divided into manageable local optimizations, where each segment handles a specific wavelength range independently.
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 improves transmittance in the short-wavelength range and achieves better luminance balance, enhancing the resolution and clarity of images, particularly in blue light emission.
Implementation Method 1
a wire grid polarizer on the second electrode. The wire grid polarizer may include a plurality of grid patterns
Implementation Method 2
the display device may further include a phase retardation layer between the second electrode and the wire grid polarizer
Implementation Method 3
the color filter layer may include a red color filter that transmits red light, a green color filter that transmits green light, and a blue color filter that transmits the blue light
Data Source
AI summary
A display device includes a first electrode on a substrate, an emissive layer on the first electrode, a second electrode on the emissive layer, and a wire grid polarizer on the second electrode. The wire grid polarizer includes a plurality of grid patterns, and a pitch between the plurality of grid patterns arranged in a blue emission area of a blue pixel providing blue light is smaller than pitches between the plurality of grid patterns arranged in emission areas of pixels providing different lights from the blue light in a horizontal direction.