Display Voltage Line Width Optimization for Luminance Uniformity
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Solution Overview
Problem
In display apparatuses, the arrangement of electrical signal lines can lead to a reduction in the arrangement area and cause differences in luminance between pixels due to voltage drops, affecting the quality of the displayed image.
Innovation Solution
A display device design that includes a light-emitting diode in the display area, a pixel circuit electrically connected to the light-emitting diode, a photo diode in a light detection area overlapping the display area, and a light detection circuit, with specific arrangements of read-out lines, connection lines, and voltage lines to minimize voltage drops and enhance image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If lines for transferring electrical signals are arranged in the peripheral area, then the arrangement area for lines is reduced, but voltage drops occur causing luminance differences between pixels
Solution Approach 1:
The patent transitions from arranging signal lines only in the peripheral area to extending them through the display area using vertical connection lines. This dimensional change allows signals to be transmitted more directly to pixels, reducing voltage drops while maintaining compact peripheral arrangements.
Solution Approach 2:
The signal transmission path is divided into multiple segments: peripheral lines, vertical connection lines, and horizontal connection lines. This segmentation allows each segment to be optimized independently, with vertical connection lines specifically addressing the voltage drop issue by providing direct pathways to pixels.
2Reliability
If vertical voltage lines with greater width are used, then voltage drop is reduced, but the device complexity increases
Solution Approach 1:
The patent applies different line width characteristics to different vertical lines based on their function. Vertical voltage lines have greater width to reduce voltage drop, while vertical connection lines have standard width. This local differentiation optimizes electrical performance without uniformly increasing complexity across all lines.
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 design reduces voltage drop-related luminance differences between pixels, enabling the display of high-quality images by optimizing the arrangement of electrical signal lines and components within the display apparatus.
Implementation Method 1
An organic photodiode (OPD) absorbs incident light and converts the light into a current by using an organic semiconductor
Implementation Method 2
A structure of the organic photodiode is very similar to a structure of an organic light-emitting diode (OLED)
Data Source
AI summary
A display device includes a light-emitting diode in a display area and a pixel circuit electrically connected to the light-emitting diode, a photo diode in a light detection area overlapping the display area, and a light detection circuit electrically connected to the photo diode, a read-out line overlapping the light detection circuit and extending in a first direction, a vertical connection line extending in the first direction in the display area, a horizontal connection line extending in a second direction crossing the first direction in the display area, and connecting the vertical connection line to the read-out line, and a vertical voltage line extending in the first direction in the display area and having a width in the second direction greater than a width in the second direction of the vertical connection line.