Light Shielding Layer Potential Stabilization for Display Panels
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Solution Overview
Problem
In display panels, the accumulation of electric charges on metal light shielding layers can affect the performance of pixel driving circuits, leading to the kink effect, which impairs display quality and fingerprint recognition accuracy.
Innovation Solution
The light shielding layer is electrically connected to a signal terminal for supplying a designated potential signal, stabilizing its electric potential and reducing floating charges, thereby eliminating the kink effect and improving the output characteristics of the driving transistor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a metal light shielding layer is used to shield light, then light shielding performance is improved, but electric charges accumulate on the light shielding layer causing the kink effect and degrading display quality
Solution Approach 1:
An insulating layer is introduced between the metal light shielding layer and the pixel driving circuit to act as an intermediary. This insulating layer prevents direct electrical contact, blocking the accumulation of electric charges on the light shielding layer while maintaining its light shielding function, thereby eliminating the kink effect without compromising display quality
Solution Approach 2:
The electrical connection between the metal light shielding layer and the pixel driving circuit is extracted/removed by introducing the insulating layer. This separation eliminates the harmful electrical interaction that causes charge accumulation and the kink effect, while the light shielding function remains intact
2Object-affected harmful factors
If a metal light shielding layer is used for light shielding, then light shielding capability is improved, but fingerprint recognition accuracy deteriorates due to the kink effect
Solution Approach 1:
The insulating layer serves as a mediator that isolates the metal light shielding layer from the pixel driving circuit, preventing charge accumulation and the resulting kink effect. This maintains the light shielding capability while restoring fingerprint recognition accuracy by eliminating the electrical interference
3Stability of the object's composition
If the light shielding layer is electrically connected to the pixel driving circuit, then electrical potential is stabilized, but floating charges affect other circuits and degrade display performance
Solution Approach 1:
The insulating layer acts as an intermediary that allows the light shielding layer to maintain its electrical potential stability independently, while preventing floating charges from interfering with other circuits. The mediator creates electrical isolation that blocks harmful electrical interactions
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 solution effectively reduces the electrical influence of floating charges on other circuits, enhancing display quality and fingerprint recognition accuracy by stabilizing the electric potential of the light shielding layer.
Implementation Method 1
a light emitting device on the first substrate, the light emitting device being configured to emit light
Implementation Method 2
a light shielding layer on the first substrate, the light shielding layer being configured to shield light, which is emitted from the light emitting device and reflected by a touch body, from being transmitted through the light shielding layer
Implementation Method 3
at least one light transmitting portion in the light shielding layer, the light transmitting portion being configured to allow the light, which is emitted from the light emitting device and reflected by the touch body, to pass through the light transmitting portion and irradiate onto an optical sensor
Data Source
AI summary
A display panel and a display apparatus including the display panel are provided. The display panel includes: a first substrate; a light emitting device on the first substrate, the light emitting device being configured to emit light; a light shielding layer on the first substrate, the light shielding layer being configured to shield light, which is emitted from the light emitting device and reflected by a touch body, from being transmitted through the light shielding layer; and at least one light transmitting portion in the light shielding layer, the light transmitting portion being configured to allow the light, which is emitted from the light emitting device and reflected by the touch body, to pass through the light transmitting portion and irradiate onto an optical sensor,wherein the light shielding layer is electrically connected to a signal terminal for supplying a designated potential signal.