Display Device Light Blocking Pattern Protrusion Overlap
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Solution Overview
Problem
Display devices with touch panels face issues due to differences in dielectric constants and touch sensitivities caused by the introduction of a light blocking pattern layer, which affects the performance of the input sensing layer.
Innovation Solution
A display device design that includes a light blocking pattern layer with openings over protrusions on the pixel defining films, reducing the dielectric constant difference and improving touch sensitivity by modifying the light blocking pattern layer to overlap only certain areas, thereby optimizing the placement of sensing electrodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a light blocking pattern layer is introduced to improve reflective color, then the reflective color is improved, but differences in dielectric constants and touch sensitivities occur
Solution Approach 1:
The light blocking pattern layer is designed with different patterns in different regions: in the first region, light blocking patterns are disposed to improve reflective color, while in the second region, no light blocking patterns are disposed to maintain touch sensitivity. This local differentiation resolves the contradiction by applying the light blocking function only where needed for color improvement without compromising touch sensitivity in the second region.
2Illumination intensity
If a protrusion is disposed on a pixel defining film, then the light blocking effect is improved, but dielectric constant difference increases
Solution Approach 1:
The protrusion is disposed only in the first region where light blocking is needed, while the second region maintains a flat structure. This local placement allows the protrusion to enhance light blocking effect in the first region without creating dielectric constant differences that would affect touch sensitivity in the second region.
Solution Approach 2:
The light blocking function is extracted from a uniform structure and concentrated in the protrusion in the first region, while the second region is kept free of protrusions and light blocking patterns. This extraction allows the protrusion to provide enhanced light blocking where needed without adversely affecting the dielectric constant uniformity in the second region.
Data Source
AI summary
A display device includes a display element layer, a light blocking pattern layer disposed on the display element layer, and an input sensing layer disposed on the light blocking pattern layer. The display element layer includes a plurality of pixel defining films and a protrusion disposed on at least one pixel defining film, the light blocking pattern layer includes a light blocking part that overlaps the protrusion and an opening, the input sensing layer includes a plurality of sensing electrodes and a plurality of intersections where the sensing electrodes cross each other. The protrusion, the opening, and at least some of the plurality of intersections overlap each other.