Display Panel Top Light-Shielding Layer for Transistor Stability
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Solution Overview
Problem
Display panels face reliability issues due to transistor threshold voltage drift caused by external factors like light, leading to voltage instability and function failure in light-emitting shift circuits, affecting display performance.
Innovation Solution
A display panel design incorporating a top light-shielding layer that overlaps with the channel of control transistors to block external light, reducing the impact on threshold voltage and enhancing the stability of the light-emitting shift circuit, thereby ensuring a stable output voltage and improved brightness accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the light-emitting shift circuit uses transistors to control light-emitting signals, then the circuit can achieve signal transmission and control functions, but the transistor threshold voltage drifts under external light influence, causing voltage instability and reducing circuit reliability
Solution Approach 1:
The patent introduces a light-shielding layer as an intermediary component between the external light environment and the control transistor channels. This layer blocks harmful light from reaching the transistor channels, preventing light-induced threshold voltage drift while allowing the transistor circuit to maintain its signal transmission and control functions normally
Solution Approach 2:
The patent extracts and isolates the light-sensitive control transistor channels from the harmful light environment by positioning them beneath the light-shielding layer. This separation removes the adverse light influence from the transistor operation area, enabling stable threshold voltage and reliable circuit performance
2Manufacturing precision
If the transistor channel is exposed to external light, then the display panel structure remains simple and compact, but the threshold voltage drifts causing output signal jumps and affecting light-emitting accuracy
Solution Approach 1:
The light-shielding layer serves as a protective intermediary that stabilizes the transistor threshold voltage by blocking external light. This ensures consistent transistor operation and accurate light-emitting control without compromising the overall structural simplicity of the display panel
3Reliability
If the light-shielding layer is added to protect control transistors from light, then the threshold voltage stability improves, but the device structure becomes more complex
Solution Approach 1:
The patent merges the light-shielding function with the existing display panel structure by integrating the light-shielding layer into the overall layer configuration. This approach protects the control transistors while maintaining structural compactness and avoiding significant increases in device complexity
Solution Approach 2:
The light-shielding layer performs multiple functions: it blocks harmful light from reaching control transistors, stabilizes threshold voltage, and maintains structural integration within the display panel. This multi-functionality reduces the need for additional separate protective components, thereby limiting the increase in device complexity
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
The top light-shielding layer effectively prevents light-induced threshold voltage shifts, stabilizing the light-emitting shift circuit and maintaining consistent light-emitting performance, thus enhancing the reliability and accuracy of the display panel.
Implementation Method 1
a top light-shielding layer configured to receive a voltage signal... in a direction perpendicular to a plane of the substrate, the top light-shielding layer overlaps with a channel of one or more of the at least one control transistor
Data Source
AI summary
A display panel and a display device, including a substrate, a circuit layer located at a side of the substrate, and a top light-shielding layer configured to receive a voltage signal. The circuit layer includes a light-emitting shift circuit, including a first output module and a control module. The first output module is electrically connected to a first node, a first fixed potential signal line, and a light-emitting control signal line and is configured to, in response to a voltage of the first node, transmit a light-emitting enable voltage provided by the first fixed-potential signal line to the light-emitting control signal line. The control module is connected to the first node and includes a control transistor. The top light-shielding layer is located at a side of the control transistor. In a direction perpendicular to the substrate, the top light-shielding layer overlaps with a channel of the control transistor.