Display Panel Thermal Conductive Functional Layer Heat Dissipation
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Solution Overview
Problem
Display panels are prone to damage due to excessive heat accumulation caused by large turned-on currents, particularly in large-sized displays where impedance loads are high, leading to potential burning issues with depletion-type oxide transistors prone to negative threshold value shifts under external light.
Innovation Solution
A display panel design incorporating a gate driving circuit with cascaded shift register units, featuring a thermal conductive functional layer, an active layer with multiple sub-portions forming the channel region of transistors, and conductive layers connected through via holes to dissipate heat efficiently, including a light shielding material to prevent threshold value shifts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a display panel uses depletion-type oxide transistors with large turned-on currents, then the driving capability is improved, but heat accumulation increases causing potential burning damage
Solution Approach 1:
The patent introduces a light shielding layer that doubles as a heat dissipation pathway. The layer conducts heat from the active layer to the base substrate while simultaneously blocking light from reaching the channel region. This converts the potential harm of heat accumulation into a beneficial heat dissipation mechanism that protects the transistor from both light-induced threshold shifts and thermal damage
Solution Approach 2:
The light shielding layer acts as an intermediary between the active layer and the base substrate. It provides a thermal conduction pathway for heat dissipation while blocking optical radiation from reaching the channel region. This intermediary structure resolves the contradiction by managing both thermal and optical interactions separately
2Reliability
If the light shielding layer is positioned close to the active layer, then light-induced threshold value shifts are prevented, but heat dissipation efficiency may be reduced
Solution Approach 1:
The patent optimizes the thickness and material properties of the light shielding layer to achieve optimal thermal conduction. By adjusting the physical parameters of the light shielding layer, it provides sufficient light blocking capability while maintaining adequate thermal conduction to dissipate heat effectively
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 design effectively manages heat dissipation and reduces the risk of damage by quickly transferring and dissipating heat from conductive layers to the base substrate, maintaining transistor performance and preventing burning risks.
Implementation Method 1
a material of the functional layer is a thermal conductive material... quickly transferring and dissipating heat from conductive layers to the base substrate
Implementation Method 2
the material of the functional layer is a light shielding material... prevent threshold value shifts
Data Source
AI summary
The present disclosure provides a display panel and a display device. The display panel includes a gate driving circuit including a first transistor; a base substrate; a functional layer located on a side of the base substrate, a material of the functional layer is a thermal conductive material, and the functional layer includes a first functional portion; an active layer located on a side of the functional layer away from the base substrate, the active layer includes a first active portion including at least one first active sub-portion which is configured to form a channel region of the first transistor; a second conductive layer located on a side of the active layer away from the base substrate, the second conductive layer includes a first conductive portion connected to the first functional portion through a first via hole.