Display Panel Ink Layer for Static Charge Dissipation
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Solution Overview
Problem
Conventional display devices suffer from the accumulation of electric charges generated by friction between the cover window and external objects, leading to a shift in the threshold voltage of driving thin film transistors, causing the 'green' phenomenon and deteriorating image quality.
Innovation Solution
A display panel design featuring a multi-layer ink layer with a conductive material under the cover window, directly adhered to a middle frame, which discharges electric charges to prevent their penetration into the panel layer, thereby maintaining transistor stability and preventing the 'green' phenomenon.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a cover window is used to protect the display panel, then the display panel is protected from external shocks, but electric charges accumulate in the cover window and penetrate into the panel layer causing threshold voltage shifts
Solution Approach 1:
The patent introduces an intermediate structure between the cover window and the display panel consisting of multiple layers (adhesive layer, black matrix, middle frame, and conductive layers). This intermediary structure serves as a charge dissipation pathway that prevents direct charge penetration into the panel while maintaining the cover window's protective function. The conductive layers with different resistance values create a controlled discharge path for static electricity.
Solution Approach 2:
The patent changes the electrical parameters of the intermediate layers by using materials with specific resistance values. The first conductive layer has a first resistance value and the second conductive layer has a second resistance value, creating a gradient that controls charge flow. This parameter optimization allows the structure to both protect from shocks and dissipate charges effectively.
2Power
If the threshold voltage of the driving thin film transistor shifts higher, then the display panel emits light by a higher voltage, but this causes the green phenomenon and deteriorates image quality
Solution Approach 1:
The patent applies preliminary anti-action by preventing the threshold voltage shift before it occurs. The conductive layers and intermediate structure are designed to dissipate static charges before they can penetrate into the panel and affect the transistor threshold voltage. This proactive charge management prevents the green phenomenon and maintains consistent image quality.
3Power
If the threshold voltage of the driving thin film transistor is decreased, then the display panel emits light by a lower voltage, but this also causes the green phenomenon and deteriorates image quality
Solution Approach 1:
The patent uses disposable conductive materials in the intermediate layers that are specifically designed to absorb and dissipate charges. These conductive layers act as sacrificial elements that handle the charge dissipation function, protecting the critical display components from voltage shifts and image quality degradation.
4Reliability
If a multi-layer ink layer with conductive material is added under the cover window, then electric charges are discharged and transistor stability is maintained, but the device complexity increases
Solution Approach 1:
The patent achieves multi-functionality by designing the intermediate layers to serve multiple purposes: the adhesive layer provides both bonding and charge dissipation, the black matrix provides both optical shielding and structural support, and the conductive layers provide both charge management and electrical connectivity. This universal design reduces the need for separate dedicated components.
Solution Approach 2:
The patent merges multiple functions into the intermediate structure between the cover window and display panel. Rather than adding separate charge dissipation components, the conductive layers are integrated into the existing adhesive and black matrix structure, combining mechanical bonding, optical shielding, and electrical charge management in a single integrated system.
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
Prevents the shift in threshold voltage of transistors and the resulting image quality deterioration by effectively discharging electric charges generated at the cover window, thus maintaining image quality.
Implementation Method 1
at least one layer of the ink layer may include a conductive material... electric charges that are generated in the cover window are discharged to the middle frame via the conduct material in the ink layer
Data Source
AI summary
A display panel includes a cover window, an adhesive layer disposed on the rear surface of the cover window, an ink layer disposed between the cover window and the adhesive layer and including a first layer and a second layer, a panel layer disposed below the adhesive layer, a backplate disposed below the panel layer, a driver IC disposed below the panel layer, and a heat dissipation sheet disposed between the backplate and the driver IC, wherein the panel layer includes: a flexible substrate including an active area, a bending area, and a pad area, a thin film transistor disposed on the flexible substrate and including a gate electrode, a source electrode, a drain electrode, and a semiconductor layer, a first planarization layer and a second planarization layer sequentially disposed on the thin film transistor, an intermediate electrode disposed on the first planarization layer and electrically connected to the thin film transistor, a light emitting element disposed on the second planarization layer and including an anode electrode, a light-emitting portion, and a cathode electrode, an encapsulation layer disposed on the light emitting element.