Display Panel Power Line Segmentation and Anti-Reflection Filtering
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Solution Overview
Problem
Current OLED display panels suffer from color breakup and color shift due to unevenness in the optical path caused by the interference of the first electrode with the propagation of light, which is exacerbated by the width difference between power and data lines and the placement of through-holes in the power lines.
Innovation Solution
The display panel design includes a wider power line that overlaps with light-emitting devices, featuring through-holes with interconnection portions connected to pixel circuits, and an anti-reflection layer with filter portions that match the color of overlapping light-emitting devices, reducing ambient light reflection and alleviating color issues by ensuring a flatter first electrode and improved optical path consistency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the power line width is increased to improve electrical connection reliability, then the power line can provide better power supply stability, but it causes greater interference with light propagation and exacerbates color breakup and color shift
Solution Approach 1:
The power line is divided into multiple segments by introducing through-holes, which break the continuous wide conductive structure into discontinuous segments. This segmentation reduces the overall light-blocking area while maintaining electrical connectivity through the interconnection portions at the through-holes, thereby reducing color breakup and color shift caused by light interference.
Solution Approach 2:
The power line structure is optimized with different local characteristics: the main power line has sufficient width for reliable electrical connection, while the interconnection portions at through-holes are designed with specific dimensions and positions to minimize light interference. This local differentiation allows the power line to simultaneously achieve good electrical performance and reduced optical interference.
2Object-affected harmful factors
If the first electrode is made flatter to improve optical path consistency, then color breakup and color shift are reduced, but the manufacturing process becomes more complex
Solution Approach 1:
The first electrode is pre-formed with a flat surface structure during the manufacturing process, before subsequent assembly steps. This preliminary flattening action ensures that the electrode maintains good optical path consistency throughout the device assembly and operation, reducing color breakup and color shift without requiring complex post-processing.
3Reliability
If through-holes are added to power lines to improve electrical connectivity, then power distribution to pixel circuits is enhanced, but light propagation interference increases
Solution Approach 1:
Interconnection portions are introduced as intermediary elements that bridge the electrical connection between the segmented power line sections at the through-holes. These interconnection portions serve as mediators that maintain electrical connectivity while their optimized design minimizes the light-blocking effect, thus reducing light propagation interference.
4Object-affected harmful factors
If filter portions are added to the anti-reflection layer to reduce ambient light reflection, then display contrast is improved, but the device structure becomes more complex
Solution Approach 1:
The filter portions are integrated into the anti-reflection layer structure, combining the functions of anti-reflection and color filtering in a single layer. This merging of functions reduces the need for separate components and simplifies the overall device structure while effectively reducing ambient light reflection and improving display 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 enhances the display panel's ability to reduce color breakup and shift by maintaining a flat first electrode and optimizing the optical path, thereby improving the overall display quality and reducing the need for thick circular polarizers.
Implementation Method 1
an anti-reflection layer arranged on a side of the light-emitting devices away from the substrate, and including a plurality of filter portions distributed in an array, wherein one of the filter portions overlaps with one of the light-emitting devices, and a color of one of the filter portions is the same as a color of light emitted by a light-emitting device which overlaps with the one of the filter portions
Data Source
AI summary
A display panel and a display device. The display panel comprises: a driving backplane, which comprises a substrate, and a circuit layer, a wiring layer and a first planarization layer, which are sequentially stacked away from the substrate, the circuit layer comprising a plurality of pixel circuits, the wiring layer comprising a data line and a power line distributed in a row direction, the width of the power line being greater than the width of the data line. the power line being provided with a plurality of through holes distributed in a column direction, each through hole being internally provided with an adapter portion, which is on the same layer as and spaced apart from the power line, and one adapter portion being connected to one pixel circuit; light-emitting devices, which are distributed on the side of the first planarization layer away from the substrate and are connected to the pixel circuits, each of which comprises a first electrode, a light-emitting layer and a second electrode, and at least some of the light-emitting devices overlapping with a region of the power line in which no through hole is provided; and an anti-reflection layer, which is arranged on the side of the light-emitting devices away from the substrate and comprises a plurality of light filter portions distributed in an array, one light filter portion overlapping with one light-emitting device, and the light filter portion having the same color as light emitted by the light-emitting device, which light overlaps with the light filter portion.