Segmented Signal Line Layout for Large High-Resolution Displays
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Solution Overview
Problem
Increasing screen size and definition in display devices leads to higher wiring resistance and parasitic capacitance, causing signal delays, display unevenness, and increased power consumption, particularly in devices with screen diagonals of 30 inches or more and resolutions of 4K or more.
Innovation Solution
The display device is designed with signal lines divided into upstream and downstream segments, each connected to separate driver circuits, reducing wiring resistance and parasitic capacitance by half, and optionally employing a double-source or triple-source type layout to minimize perceived boundaries and ensure balanced pixel connections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If screen size and definition are increased, then display quality and resolution are improved, but wiring resistance and parasitic capacitance increase causing signal delays and display unevenness
Solution Approach 1:
The signal lines are divided into multiple segments with different wiring materials assigned to different segments. Specifically, a first wiring material with lower resistance is used for the first signal line segment, while a second wiring material is used for the second signal line segment. This segmentation allows optimization of signal transmission in different regions of the large-screen display, reducing overall wiring resistance and parasitic capacitance effects.
2Area of stationary object
If screen size is increased, then display area is expanded, but wiring resistance increases causing voltage drops and power consumption increase
Solution Approach 1:
Different wiring materials with different electrical properties are assigned to different regions (signal line segments) based on their specific requirements. The first wiring material is used where lower resistance is critical, while the second wiring material is used in other segments. This local optimization reduces overall power consumption by minimizing resistive losses in the expanded display area.
Data Source
AI summary
A display device with favorable display quality is provided. A display portion where a plurality of pixels is arranged in a matrix is divided into Region A and Region B, i.e., regions on the upstream side and the downstream side of a scanning direction. A signal line for supplying an image signal is provided in each of Region A and Region B. Region A and Region B adjoin each other such that a boundary line showing the boundary between the regions is bent. Bending the boundary line suppresses formation of a stripe in a boundary portion. For example, in a given column, the total number of pixels electrically connected to a signal line in Region A is made different from the total number of pixels electrically connected to a signal line in Region B.