Display Driver Hold Capacitors for Voltage Stabilization
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Solution Overview
Problem
Display apparatuses face challenges in stabilizing driving voltages during startup, leading to voltage distortion and short-circuits due to inrush currents, which affect the operation of scan and emission control drivers.
Innovation Solution
Incorporating hold capacitors adjacent to stages of the driver to charge and initialize capacitors connected to nodes, reducing voltage distortion and preventing short-circuits by stabilizing the application of driving voltages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If driving voltages are applied to the driver during startup, then the driver can operate, but voltage distortion and short-circuits occur due to inrush currents
Solution Approach 1:
Hold capacitors are connected to voltage lines before the driver operates to pre-stabilize the driving voltages. This preliminary action ensures that when the driver starts up, the voltages are already stabilized, preventing inrush currents and voltage distortion.
Solution Approach 2:
Hold capacitors act as intermediary elements between the voltage source and the driver stages. They mediate the voltage application process by filtering and stabilizing the driving voltages, preventing direct inrush currents from reaching the driver stages during startup.
2Reliability
If hold capacitors are connected to voltage lines, then voltage stabilization is achieved, but device complexity increases
Solution Approach 1:
The hold capacitors are merged with the existing voltage line structure rather than being completely separate components. This integration approach adds the necessary capacitance while minimizing additional structural complexity and maintaining compact design.
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 use of hold capacitors ensures stable application of driving voltages, reducing voltage distortion and preventing short-circuits, thereby improving the operational stability and displaying characteristics of the display apparatus.
Implementation Method 1
Incorporating hold capacitors adjacent to stages of the driver to charge and initialize capacitors connected to nodes, reducing voltage distortion and preventing short-circuits by stabilizing the application of driving voltages
Data Source
AI summary
A display apparatus includes: a substrate having a display area and a non-display area; a plurality of gate lines extending in a first direction disposed on the display area of the substrate; and a driver disposed on the non-display area, the driver including: a plurality of stages connected to the plurality of gate lines; a first voltage line and a second voltage line that are connected to the plurality of stages to respectively supply a first direct current (DC) voltage and a second DC voltage to the plurality of stages; and at least one capacitor connected to at least one of the plurality of stages, the at least one capacitor including a pair of electrodes, wherein one of the electrodes is electrically connected to one of the first voltage line and the second voltage line.