Fan-out unit with overlapping multi-layer lines for OLED displays
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Solution Overview
Problem
In high-resolution flat panel displays, the limited space in the non-display region poses challenges for arranging fan-out lines without increasing dead space, and the use of a multiplexer is not feasible, leading to inefficiencies in signal transmission.
Innovation Solution
The display apparatus features a fan-out unit with multiple line groups formed at different layers, where each line group includes a first, second, and third fan-out line, with the third line partially overlapping with the first and second lines, allowing for efficient signal transmission to different types of pixels while reducing dead space through diagonal offsetting of pads and using materials like molybdenum, aluminum, copper, and transparent conductive oxide.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If fan-out lines are formed in the same layer using gate metal, then signal transmission is achieved, but the display area is reduced and dead space increases
Solution Approach 1:
The patent transitions fan-out lines from a single-layer planar arrangement to a multi-layer three-dimensional structure. Fan-out lines are formed in different layers (first, second, and third fan-out lines at different vertical positions) with insulating layers between them, allowing lines to overlap in the planar view while being separated vertically. This dimensional change enables more fan-out lines to be accommodated within the same footprint area, increasing the number of lines without proportionally increasing the occupied area.
2Quantity of substance
If a multiplexer is used to reduce the number of fan-out lines, then the number of lines is reduced, but it cannot be used in high-resolution displays
Solution Approach 1:
The patent segments fan-out lines into different layers and groups them by function. First fan-out lines, second fan-out lines, and third fan-out lines are formed at different layers, with insulating layers separating them. This segmentation allows each layer to carry specific signal types (e.g., different color channel signals for RGB pixels) without requiring multiplexing, thereby maintaining high-resolution display capability while reducing the total number of lines through vertical stacking.
3Quantity of substance
If the fan-out unit is made large to accommodate more lines, then signal transmission capacity increases, but dead space increases
Solution Approach 1:
The patent implements a nested structure where fan-out lines in different layers are positioned to overlap in the planar view. The first, second, and third fan-out lines are arranged such that they occupy overlapping horizontal spaces but are separated vertically by insulating layers. This nesting arrangement allows multiple signal transmission paths to share the same footprint area, increasing signal transmission capacity without proportionally increasing the occupied area or dead space.
Data Source
AI summary
A display apparatus and an organic display apparatus are disclosed. In one aspect, the display apparatus includes a display substrate divided into a display region for displaying an image via a plurality of pixels for emitting light and a non-display region around the display region. It includes a pad unit formed on the non-display region. It also includes a fan-out unit for connecting the display region and the pad unit. It further includes a plurality of line groups sequentially formed, wherein each line group includes a first fan-out line, a second fan-out line insulated from the first fan-out line by a first insulating layer, and a third fan-out line insulated from the second fan-out line by a second insulating layer, and wherein the third fan-out line at least partially overlaps with at least one of the first and second fan-out lines.