EL Display Device Dynamic On-Resistance Control
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Solution Overview
Problem
Existing EL display devices face degradation due to overheating, leading to a decrease in image quality and luminance, as increased power consumption generates heat, affecting the longevity and performance of EL elements.
Innovation Solution
An EL display device is designed with a control system that includes a current detecting circuit and a control voltage generating circuit, which adjust the control voltage applied to switching transistors to manage the current flowing through EL elements, reducing heat generation and maintaining display quality by varying the on-resistance of switching transistors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the current flowing through EL elements is increased to improve display luminance, then the display luminance is improved, but the heat generation increases causing EL element degradation
Solution Approach 1:
The patent implements dynamic control of the switching transistor's on-resistance based on detected current levels. The control voltage generating circuit adjusts the gate voltage of the switching transistor in real-time to modulate its on-resistance, thereby dynamically regulating the current flowing through EL elements to prevent overheating while maintaining display luminance
Solution Approach 2:
The patent employs a feedback mechanism where the current detecting circuit continuously monitors the current flowing through EL elements and provides this information to the control voltage generating circuit. This feedback loop enables the system to automatically adjust the switching transistor's on-resistance to maintain optimal current levels, preventing both overheating and luminance degradation
2Use of energy by moving object
If the on-resistance of switching transistor is decreased to increase current flow, then the current consumption is improved, but the heat generation increases
Solution Approach 1:
The patent changes the electrical parameters of the switching transistor by dynamically adjusting its on-resistance through variable gate voltage. The control voltage generating circuit modifies the gate voltage level to optimize the transistor's on-resistance, enabling efficient current control that reduces both power consumption and heat generation in the switching element
3Temperature
If the current flowing through EL elements is reduced to decrease heat generation, then the heat generation is reduced, but the display luminance decreases
Solution Approach 1:
The system dynamically adjusts the switching transistor's on-resistance based on real-time current detection. When current levels are high, the on-resistance is increased to reduce current and temperature. When current levels are low, the on-resistance is decreased to maintain display luminance, creating a dynamic balance between heat generation and display quality
4Object-generated harmful factors
If the on-resistance of switching transistor is increased to reduce current flow, then the heat generation is reduced, but the current consumption increases
Solution Approach 1:
The patent optimizes the switching transistor's on-resistance parameter through dynamic gate voltage control. By precisely adjusting the gate voltage, the system achieves minimal on-resistance when high current is needed and increased on-resistance when current reduction is required, optimizing the trade-off between heat generation and current consumption
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 approach effectively reduces the degradation of EL elements, maintains excellent display quality, and minimizes the decrease in image quality by controlling the current and heat generation, thereby extending the lifespan of the display panel.
Implementation Method 1
organic electroluminescent elements (hereinafter, the organic electroluminescence may be referred to as EL or OLED)
Implementation Method 2
varying the on-resistance of switching transistors
Implementation Method 3
a current amount obtaining circuit which obtains a magnitude of a current flowing through the plurality of pixels
Data Source
AI summary
An EL display device includes a display screen; a first gate signal line; a second gate signal line; gate driver ICs (circuits); a current generating circuit which supplies a current to EL elements; a current amount obtaining circuit which obtains a magnitude of a current flowing through a plurality of pixels; and an on-voltage generating circuit which generates a control voltage output by the gate driver IC (circuit) to the first gate signal line. Each of the pixels includes a first switching transistor. The control voltage is a voltage which causes the first switching transistor to be in a conducting state. The on-voltage generating circuit varies a first control voltage based on an output result from the current amount obtaining circuit.