Display Panel Filter with Wavelength Selective Absorption
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Solution Overview
Problem
Current display technologies face challenges in producing highly convenient, useful, and reliable display panels that effectively narrow the spectrum widths of light emitted by pixels, leading to vivid color representation without requiring structural changes in the light-emitting material layer for each color.
Innovation Solution
A display panel design incorporating a filter with transmittance spectrum local minimums at specific wavelengths, overlapping with pixels emitting light at different wavelengths, and a microcavity structure with light-emitting elements, allowing for narrow spectrum emission and vivid color display without altering the light-emitting material structure for each pixel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a filter with transmittance spectrum local minimums is introduced to narrow the spectrum width of emitted light, then the color vividness is improved, but the device structure becomes more complex
Solution Approach 1:
The patent introduces a filter as an intermediary component between the light-emitting pixels and the viewer. This filter contains absorption layers with specific transmittance spectrum characteristics (local minimums at wavelengths between adjacent pixel emission wavelengths) that selectively absorb unwanted spectral components. By placing this intermediary filter in the optical path, the patent achieves narrow spectrum width and vivid color representation without modifying the light-emitting material structure itself, thus resolving the contradiction between color quality and structural complexity.
2Manufacturing precision
If the light-emitting material structure is changed for each pixel to achieve narrow spectrum emission, then the color precision is improved, but the manufacturing complexity increases
Solution Approach 1:
The patent segments the color control function into two independent parts: (1) the light-emitting pixels that generate broad-spectrum light using identical light-emitting materials, and (2) the filter that selectively transmits or absorbs specific wavelengths. This segmentation allows the light-emitting material layer to remain uniform across all pixels, simplifying manufacturing, while the filter handles the wavelength selection to achieve precise color control. The absorption layers in the filter are designed with specific transmittance characteristics without requiring changes to the pixel structure.
Solution Approach 2:
The patent changes the optical parameters of the filter rather than the light-emitting materials. Specifically, the filter is designed with absorption layers that have transmittance spectrum local minimums at specific wavelengths (between the emission wavelengths of adjacent pixels). This parameter change in the filter's optical characteristics enables precise color control while maintaining identical light-emitting material structures across all pixels, thereby improving color precision without increasing manufacturing complexity.
3Illumination intensity
If the spectrum width is narrowed using a filter, then the color purity is improved, but the light intensity is reduced
Solution Approach 1:
The patent optimizes the transmittance spectrum parameters of the filter to achieve a balance between color purity and light intensity. The absorption layers are designed with specific transmittance characteristics, including local minimums at wavelengths between adjacent pixel emission wavelengths, while maintaining higher transmittance at the desired emission wavelengths. By carefully controlling the filter's optical parameters (transmittance spectrum shape, depth of absorption bands, bandwidth), the patent achieves narrow spectrum width and high color purity while minimizing the overall light intensity reduction.
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 enables a novel display panel that achieves narrow spectrum widths and vivid color representation, enhancing the convenience, usefulness, and reliability of display devices by maintaining a consistent light-emitting material structure across different pixels.
Implementation Method 1
the absorption layer absorbs part of light having a shorter wavelength than the one wavelength and part of light having a longer wavelength than the one wavelength more than light having the one wavelength
Implementation Method 2
a conductive film overlapping with the absorption layer and a light-emitting module electrically connected to the conductive film, in which the conductive film reflects visible light
Data Source
AI summary
A novel display panel that is highly convenient, useful, or reliable is provided. The display panel includes a display region and includes a first pixel, a second pixel, a third pixel, and a filter. The first pixel emits light with a spectrum having a local maximum at a first wavelength, the second pixel emits light with a spectrum having a local maximum at a second wavelength, and the third pixel emits light with a spectrum having a local maximum at a third wavelength. The filter includes a region overlapping with the first pixel, a region overlapping with the second pixel, and a region overlapping with the third pixel, and the filter has a transmittance spectrum having local minimums at a fourth wavelength and a fifth wavelength. The second wavelength is longer than the first wavelength. The third wavelength is longer than the second wavelength. The fourth wavelength is between the first wavelength and the second wavelength. The fifth wavelength is between the second wavelength and the third wavelength.