Display Pixel Voltage Line Layout to Prevent Alignment Line Floating
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Solution Overview
Problem
Current display devices face challenges in ensuring reliable operation due to issues with alignment and power distribution among the alignment voltage supply lines, leading to potential floating of lines after light emitting elements are aligned.
Innovation Solution
The display device incorporates a configuration where an identical driving voltage is applied to at least two alignment voltage supply lines, which are used as power lines for driving pixels, and includes a circuit board with anisotropic conductive films to ensure electrical connection between pads, preventing floating and enhancing reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If alignment voltage supply lines are used separately for alignment and power distribution, then alignment function is achieved, but lines may float after alignment causing reliability issues
Solution Approach 1:
The patent applies multi-functionality by enabling alignment voltage supply lines to serve dual purposes: performing alignment functions during manufacturing and serving as power distribution lines during operation. This is achieved by applying an identical driving voltage to at least two alignment voltage supply lines, allowing them to function as power lines without requiring separate power distribution infrastructure, thereby improving reliability while avoiding increased complexity
Solution Approach 2:
The patent merges the alignment voltage supply lines with power distribution functions by connecting them to power supply terminals through the circuit board. This combining eliminates the need for separate power lines, preventing floating issues and ensuring reliable power distribution to pixel electrodes while maintaining the alignment capability
2Reliability
If separate power distribution lines are added to prevent floating, then reliability is improved, but device complexity increases
Solution Approach 1:
The patent eliminates the need for separate power distribution lines by making alignment voltage supply lines multi-functional. These lines simultaneously perform alignment operations and power distribution, connected to power supply terminals via the circuit board. This approach ensures reliable power delivery to pixel electrodes without adding structural complexity
Solution Approach 2:
The patent combines alignment and power distribution functions into the same physical lines. By applying identical driving voltage to multiple alignment lines and connecting them to power supply terminals, the system merges two functions into one infrastructure, preventing floating issues while maintaining simplicity
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 effectively prevents floating of alignment voltage supply lines and ensures reliable operation by using the alignment voltage supply lines as power lines for the pixels, improving the overall reliability of the display device.
Implementation Method 1
an anisotropic conductive film between the substrate and the circuit board to electrically connect the first pads and the second pads. The anisotropic conductive film may include: an adhesive film located between the substrate and the circuit board; and conductive particles in the adhesive film to electrically connect the first pads and the second pads
Data Source
AI summary
A display device may include: a substrate including a display area and a non-display area; pixels in the display area, each of the pixels including first to fourth electrodes, and light emitting elements connected with the first to fourth electrodes; first pads in a pad area of the non-display area; first to third lines provided in the non-display area; and a circuit board overlapping with the pad area of the substrate and including second pads electrically connected with the first pads. The first pads may include a 1-1th pad connected to the first line, a 1-2th pad connected to the second line, and a 1-3th pad connected to the third line. An identical driving voltage may be applied to at least two lines of the first to third lines. The first to third lines may apply alignment signals to the first to fourth electrodes.