Display Panel Cut-Off Filter Film for Easier LED Bin Classification
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Solution Overview
Problem
The increasing complexity of display products requires finer Bin classification of light-emitting elements, leading to increased difficulty and cost in the Bin classification process, especially for micro-sized display products.
Innovation Solution
A display panel with a cut-off filter film layer in the encapsulation layer that filters the emitted light, narrowing its wavelength range and improving color purity and uniformity, allowing for coarser Bin classification granularity without compromising display quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If finer Bin classification is implemented to improve display quality, then color uniformity and brightness consistency are improved, but the difficulty and complexity of Bin classification increases greatly
Solution Approach 1:
The patent introduces a wavelength narrowband filter as an intermediary component between the light-emitting element and the external environment. This filter mediates the relationship by selectively transmitting a narrow wavelength range while blocking other wavelengths, thereby achieving precise color control without requiring strict Bin classification of the light-emitting elements themselves. The filter acts as a wavelength selector that simplifies the overall system requirements.
Solution Approach 2:
The patent changes the wavelength transmission parameter of the filter to achieve color uniformity. By designing the filter with a specific narrow bandwidth (e.g., 30-50nm), the system transforms the approach from controlling the light-emitting element parameters to controlling the filter transmission parameters, thereby reducing Bin classification complexity while maintaining display quality.
2Manufacturing precision
If finer Bin classification is implemented to improve display quality, then color uniformity and brightness consistency are improved, but production cost increases due to higher discarding rate of light-emitting elements
Solution Approach 1:
The wavelength narrowband filter serves as an intermediary that compensates for variations in light-emitting element characteristics. Instead of discarding elements that fall outside strict Bin specifications, the filter compensates for their wavelength variations by only transmitting the desired narrow wavelength range, thereby reducing the discard rate while maintaining display quality.
Solution Approach 2:
The patent converts the broad wavelength emission characteristic of light-emitting elements (which is typically a disadvantage requiring strict Bin classification) into a benefit by using a filter to select the desired narrow wavelength range. This approach allows elements with varying wavelength characteristics to be utilized effectively, transforming what was previously a source of waste into a manageable parameter.
3Manufacturing precision
If more Bin levels are classified to improve display quality, then color uniformity is improved, but the difficulty of Bin classification increases greatly
Solution Approach 1:
The wavelength narrowband filter acts as an intermediary that performs the color uniformity function optically rather than through complex classification processes. The filter's narrow transmission band inherently ensures color uniformity by blocking unwanted wavelengths, eliminating the need for multiple Bin levels and complex detection and measurement systems.
Solution Approach 2:
Instead of classifying light-emitting elements into multiple Bin levels to achieve color uniformity, the patent inverts the approach by using a filter to achieve color uniformity regardless of the light-emitting element variations. This inversion simplifies the detection and measurement requirements while maintaining color uniformity.
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 use of the cut-off filter film layer reduces the fineness requirement for Bin classification, decreases the difficulty of Bin classification, and improves the utilization rate of light-emitting elements, thereby reducing production costs and discarding of light-emitting elements.
Implementation Method 1
the encapsulation layer includes a cut-off filter film layer; wherein the plurality of the light-emitting elements generate emitted light of at least two colors; wherein, the cut-off filter film layer includes a plurality of filter areas, and one filter area filters the emitted light of one color, so that a wavelength range of the emitted light transmitting through the filter area is narrower than that of emergent light
Implementation Method 2
the cut-off filter film layer includes a plurality of sub-film layers disposed in a stacking manner, and every two adjacent sub-film layers have refractive indexes of different magnitudes
Implementation Method 3
every two adjacent sub-film layers have refractive indexes of different magnitudes
Data Source
AI summary
The present disclosure provides a display panel and a display device. The display panel includes a substrate, a light-emitting layer located at a side of the substrate, and an encapsulation layer located at s side of the light-emitting layer facing away from the substrate; the light-emitting layer comprises a plurality of light-emitting elements, and the encapsulation layer comprises a cut-off filter film layer, wherein the plurality of the light-emitting elements generate emitted light of at least two colors; wherein, the cut-off filter film layer comprises a plurality of filter areas, and one filter area filters the emitted light of one color, so that a wavelength range of the emitted light transmitting through the filter area is narrower than that of emergent light.