Under-Panel Sensor Display Layout for Optical Uniformity
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Solution Overview
Problem
Display devices face challenges in minimizing optical characteristic differences and luminance reduction due to the presence of under panel sensors, which can overlap the display panel, particularly in areas where holes are removed from the front surface.
Innovation Solution
The display device is designed with a first area containing under panel sensors and a second area without, featuring distinct gaps between pixel defining layers and light blocking layers, along with a thinner encapsulation layer in the first area, and an antireflection layer that includes color filters, minimizing optical differences and reducing thickness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If under panel sensors are disposed in holes defined in the front surface of the display device, then the display area is widened, but optical characteristic differences and luminance reduction occur
Solution Approach 1:
The patent applies local quality by creating different gap sizes between pixel defining layers and light blocking layers in different regions. Specifically, a first gap is formed in the first area (where sensors are located) and a second gap is formed in the second area (without sensors), where the first gap differs from the second gap. This local differentiation compensates for optical characteristic differences caused by sensor placement, thereby maintaining overall optical uniformity while preserving the widened display area.
2Area of stationary object
If under panel sensors are disposed in holes defined in the front surface of the display device, then the display area is widened, but luminance reduction occurs
Solution Approach 1:
The patent addresses luminance reduction by implementing local quality adjustments through differentiated gap structures. The first gap in the sensor area and the second gap in the non-sensor area are designed with different dimensions to compensate for light blocking effects. Additionally, the antireflection layer with integrated color filters optimizes light transmission in the sensor region, thereby maintaining luminance levels while preserving the widened display area.
3Reliability
If a polarizing plate is used to address optical issues, then optical characteristics are improved, but device thickness increases
Solution Approach 1:
The patent merges the antireflection layer and color filter layer into a single integrated structure. This combined layer performs both antireflection functionality and color filtering in one component, eliminating the need for a separate polarizing plate. The merged structure maintains optical characteristic uniformity while reducing the overall display panel thickness.
4Reliability
If multiple separate layers are used for encapsulation, then device reliability is improved, but manufacturing complexity increases
Solution Approach 1:
The patent combines the antireflection layer and color filter layer into a single integrated layer structure. This merging reduces the total number of separate layers that need to be manufactured and assembled, thereby simplifying the manufacturing process while maintaining the protective and optical functions that would otherwise require multiple separate layers for reliability.
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 design minimizes optical characteristic differences and prevents luminance reduction while allowing for a thinner display panel by optimizing the gaps and using an antireflection layer to eliminate the need for a polarizing plate.
Implementation Method 1
an antireflection layer disposed on the light emitting element layer
Implementation Method 2
a light emitting element layer, and an antireflection layer disposed on the light emitting element layer
Data Source
AI summary
A display device includes a display panel including an antireflection layer on a light emitting element layer which includes a first pixel defining layer in which an opening defining a light emitting area of a first pixel is defined, and a second pixel defining layer in which an opening defining a light emitting area of a second pixel is defined. The antireflection layer includes first and second light blocking layers respectively overlapping the first and second pixel defining layers, and includes a first gap defined by a length of a predetermined direction from an edge of the opening to an edge of an opening of the first light blocking layer, and a second gap defined by a length from an edge of the opening to an edge of an opening of the second light blocking layer in the predetermined direction. The first gap is less than the second gap.