Display Cover Glass Stack for Static Charge Shielding
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Solution Overview
Problem
Static electricity generated by the cover glass in display devices, particularly when a plastic housing is used, can conduct into the display panel, affecting the driving circuit and leading to threshold voltage shifts, resulting in poor display performance.
Innovation Solution
Incorporating a transparent conductive layer between the light-absorbing ink layer and the display panel, with its orthogonal projection overlapping the light-absorbing ink layer on the cover glass, allows static electricity to be conducted into the ink layer and further into the transparent conductive layer, preventing it from reaching the display panel substrate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a plastic housing is used in the display device, then the device structure is improved and manufacturing is easier, but static electricity is generated that conducts into the display panel causing threshold voltage shifts
Solution Approach 1:
The patent introduces a light-absorbing ink layer as an intermediary component between the cover glass and the display panel. This ink layer serves as a mediator to conduct static electricity away from the display panel substrate, thereby resolving the harmful effect of static electricity generated by the plastic housing while maintaining the housing structure.
Solution Approach 2:
The patent converts the harmful static electricity generated by the plastic housing into a beneficial effect by using the light-absorbing ink layer to conduct this static electricity to a safe path. The harmful electrical charge is redirected through the ink layer to the transparent conductive layer and eventually to the edge of the display panel, preventing damage to the driving circuit.
2Reliability
If the light-absorbing ink layer is placed under the peripheral light-shielding area, then static electricity conduction is enabled, but the display area is reduced
Solution Approach 1:
The patent applies local quality by placing the light-absorbing ink layer specifically in the peripheral light-shielding area rather than uniformly across the entire cover glass. This localized placement allows the ink layer to perform its static electricity conduction function in the peripheral region while leaving the central light-transmitting area clear for optimal display performance.
Solution Approach 2:
The patent segments the cover glass area into two functional zones: a central light-transmitting area for display and a peripheral light-shielding area for static electricity management. The light-absorbing ink layer is confined to the peripheral zone, allowing both functions to coexist without mutual interference.
3Object-affected harmful factors
If a transparent conductive layer is added between the cover glass and display panel, then static electricity shielding is improved, but device complexity increases
Solution Approach 1:
The transparent conductive layer serves multiple functions: it maintains the structural integrity of the display device, allows light transmission, and provides an electrical conduction path for static electricity. By combining these functions in a single layer, the patent reduces the need for additional separate components, thereby limiting the increase in device complexity.
Solution Approach 2:
The patent merges the functions of light transmission and electrical conduction into the transparent conductive layer. This layer simultaneously serves as part of the optical stack and as an electrical pathway for static electricity, combining multiple protective and functional roles in a single component.
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 shields static electricity from affecting the display panel's driving circuit, maintaining a good display effect by preventing electric field interference.
Implementation Method 1
The transparent conductive layer is between the cover glass and the display panel, and an orthogonal projection of the transparent conductive layer on the cover glass at least partially overlaps with an orthogonal projection of the light-absorbing ink layer on the cover glass
Data Source
AI summary
A display device includes a cover glass, a display panel, a light-absorbing ink layer, and a transparent conductive layer. The cover glass is on a light-emitting side of the display panel, and includes a central light-transmitting area and a peripheral light-shielding area at a periphery of the central light-transmitting area. The light-absorbing ink layer is on a side of the cover glass adjacent to the display panel, and the light-absorbing ink layer is under the peripheral light-shielding area. The transparent conductive layer is between the cover glass and the display panel, and an orthogonal projection of the transparent conductive layer on the cover glass at least partially overlaps with an orthogonal projection of the light-absorbing ink layer on the cover glass.