Electronic-Paper Screen Recesses Replace Outward Ear Holes
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Solution Overview
Problem
The placement of electrical connection points on conventional electronic paper screens causes irregular shaping of the electronic paper film and protective film, leading to increased size and cost due to the need for outward-extending ear holes, which reduces the screen-to-body ratio and cutting yield.
Innovation Solution
An electronic paper screen with a recess in the display area, featuring a recess on the thin film transistor substrate and an electrical connection point on the electronic paper film corresponding to the recess, eliminating the need for outward-extending ear holes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If electrical connection points are placed on outward-extending ear holes of the electronic paper film, then electrical connection between TFT substrate and electronic paper film is achieved, but the electronic paper film and protective film become irregularly shaped, increasing size and cost
Solution Approach 1:
The electrical connection point is moved from a two-dimensional position on the edge of the electronic paper film (ear hole) to a three-dimensional position within the recessed region of the display area. This dimensional change allows electrical connection without requiring outward extension of the film, maintaining regular shape while achieving connectivity.
Solution Approach 2:
The electrical connection point structure is nested within the recessed region of the display area rather than extending outward. The Ag glue dot is positioned in the recess, with the electronic paper film extending over it, creating a nested configuration that maintains compact, regular shapes while enabling electrical connection.
2Reliability
If outward-extending ear holes are created on the electronic paper film for electrical connection, then electrical connection is achieved, but the screen-to-body ratio is reduced
Solution Approach 1:
The electrical connection is achieved by moving the connection point into the recessed region within the display area boundaries, rather than extending the film outward. This keeps the overall device footprint compact, maintaining a high screen-to-body ratio while achieving reliable electrical connection.
3Reliability
If outward-extending ear holes are created on the electronic paper film, then electrical connection is achieved, but the cutting yield of FPL, PS and TFT is decreased
Solution Approach 1:
By positioning the electrical connection point within the recessed region of the display area rather than requiring outward extension, the electronic paper film maintains a regular rectangular shape. This enables more efficient arrangement and cutting of multiple screens from master slices, improving cutting yield and productivity.
4Shape
If irregular shaping of electronic paper film is avoided, then screen-to-body ratio is increased and cost is reduced, but electrical connection must be achieved without ear holes
Solution Approach 1:
The recessed region of the display area serves dual purposes: it maintains the regular shape of the electronic paper film while simultaneously providing the location for electrical connection. The display area structure itself provides the functionality previously requiring separate ear hole structures, simplifying the overall design.
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
An electronic paper screen with a recess in a display area, including a thin film transistor substrate (1) and an electronic paper film (2). A polygonal display area (101) is formed on the thin film transistor substrate (1). At least one side of the display area (101) is provided with a recess (103) that is recessed towards the display area (101). An electrical connection point (4) is provided on the electronic paper film (2) at a position corresponding to the recess (103) and configured to connect an electrode of the thin film transistor substrate (1) to an electrode of the electronic paper film (2). The present disclosure solves the technical problem that the placement of the electrical connection point causes irregular shaping of the electronic paper film and the protective film, leading to an increase in the size and cost of the electronic paper screen.