Display Device Subpixel Density and Diffraction Suppression
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Solution Overview
Problem
Existing display devices suffer from diffraction light issues in sparse pixel regions due to closely spaced scanning and data signal lines, leading to reduced transmittance and colored images.
Innovation Solution
A display device with a higher average density of subpixel circuits in the display region compared to the sparse pixel region, where subpixel circuits are strategically placed at intersection points of scanning and data signal lines, and signal lines are formed in different layers to minimize overlap and diffraction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If scanning signal lines and data signal lines are linearly provided in the region overlapping the imaging element, then display can be performed in the overlapping region, but diffraction light occurs and causes colored images
Solution Approach 1:
The patent applies dimensionality change by transitioning from a two-dimensional planar arrangement of signal lines to a three-dimensional stacked configuration. Scanning signal lines and data signal lines are provided in different layers (third substrate and fourth substrate respectively), which increases the vertical distance between lines and reduces their pitch. This spatial reorganization in the vertical dimension eliminates diffraction light effects while preserving display functionality in the overlapping region.
Solution Approach 2:
The patent segments the signal line system into distinct functional layers. Scanning signal lines are grouped on the third substrate while data signal lines are grouped on the fourth substrate. This segmentation separates the previously interleaved signal lines into distinct spatial groups, increasing the effective pitch between adjacent scanning and data lines and reducing diffraction effects.
2Area of stationary object
If signal lines are closely spaced to enable display in sparse pixel region, then display coverage is improved, but transmittance decreases and coloring occurs
Solution Approach 1:
By moving signal lines to different vertical layers (third and fourth substrates), the patent increases the vertical separation between scanning and data signal lines. This dimensional change allows the lines to be closely spaced in the horizontal plane for better display coverage while maintaining sufficient effective pitch through vertical stacking, thereby preserving light transmittance and preventing coloring.
3Manufacturing precision
If subpixel circuits are densely provided in display region, then display quality is improved, but device complexity increases
Solution Approach 1:
The patent merges control functions by having both scanning signal lines and data signal lines pass through the same sparse pixel region without requiring separate dedicated circuits for each line type. The subpixel circuits in the sparse pixel region utilize these shared signal lines, reducing the need for additional control infrastructure and simplifying the overall device architecture while maintaining display quality.
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 effectively suppresses diffraction light in sparse pixel regions, improves transmittance, and reduces color distortion, enabling reliable display performance.
Implementation Method 1
a light-emitting element
Implementation Method 2
diffraction light is caused by the effects of the wiring line pitch of the plurality of scanning signal lines linearly provided in the region overlapping the imaging element in a plan view and the wiring line pitch of the plurality of data signal lines linearly provided in the region overlapping the imaging element in a plan view
Data Source
AI summary
A display device includes a plurality of scanning signal lines; a plurality of data signal lines; and a plurality of subpixel circuits disposed at least at some of intersection points of the plurality of scanning signal lines and the plurality of data signal lines, each one of the plurality of subpixel circuits including a control circuit including a transistor and a light-emitting element, wherein an average density of subpixel circuits provided in a display region is greater than an average density of the subpixel circuits provided in a sparse pixel region, and the sparse pixel region includes a no-pixel region not including the subpixel circuits in one entire line in an extending direction of the scanning signal lines or the data signal lines-provided in the display region.