OLED Display Discharge Unit for Rapid Voltage Removal
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Solution Overview
Problem
OLED display devices face issues with delayed power-on times due to slow discharge speeds of display driving voltage when turned off, leading to inconvenience and potential noise or afterimages upon reactivation.
Innovation Solution
Incorporating a discharge unit and discharge control unit that enables rapid discharge of display driving voltage by connecting a discharge load to the display unit and controlling its operation based on the power state, using a field effect transistor and stabilization circuit to manage discharge signals and prevent unnecessary power consumption during operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the power of the display device is turned off and the voltage is allowed to discharge naturally, then the OLED element will not emit light unintentionally, but the power-on time is delayed causing user inconvenience
Solution Approach 1:
The discharge unit dynamically adjusts the discharge path resistance by switching between different resistance values based on the current state (power on or power off). When power is off, it provides a low-resistance discharge path for rapid voltage discharge. When power is on, it switches to a high-resistance state to prevent unnecessary power consumption, thus resolving the contradiction between fast discharge and power savings.
Solution Approach 2:
The discharge unit is pre-configured with multiple resistance paths that are activated in advance based on the power state signal. When power is turned off, the low-resistance discharge path is immediately activated to rapidly discharge the voltage, reducing the power-on delay time without causing unintentional OLED emission during normal operation.
2Loss of time
If a discharge unit is always enabled to rapidly discharge voltage, then the power-on time is reduced, but unnecessary power consumption occurs during normal operation
Solution Approach 1:
The discharge unit dynamically changes its resistance value based on the power state. During normal operation (power on), it maintains high resistance to prevent power consumption. When power is turned off, it switches to low resistance to enable rapid voltage discharge, thus resolving the contradiction between fast discharge and power conservation.
Solution Approach 2:
The resistance parameter of the discharge unit is changed based on the power state. A first resistance value (high) is used during normal operation to minimize power consumption, while a second resistance value (low) is used during power-off state to enable rapid discharge, effectively resolving the contradiction between power consumption and discharge speed.
3Speed
If the discharge load has low resistance for fast discharge, then the discharge speed increases, but the power consumption during operation increases
Solution Approach 1:
The resistance parameter of the discharge load is dynamically changed based on the power state. During operation, a high resistance value is maintained to minimize power consumption and heat generation. When power is turned off, the resistance is switched to a low value to enable rapid voltage discharge, thus resolving the contradiction between discharge speed and power consumption.
Solution Approach 2:
The discharge load dynamically adjusts its resistance characteristic based on operational requirements. It presents high resistance during normal operation to conserve power and low resistance during power-off state to achieve fast discharge, effectively resolving the contradiction between discharge speed and power 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 solution significantly reduces power-on times and prevents unnecessary power consumption, enhancing user satisfaction by ensuring rapid discharge of residual voltage and preventing noise or afterimages when the OLED display is reactivated.
Implementation Method 1
The OLED is a self-luminous organic material that emits light by itself by using an electroluminescence phenomenon that light is emitted when a current flows through a fluorescent organic compound
Implementation Method 2
a discharge unit connected to the display unit and configured to perform a discharge operation on a display driving voltage applied to the display unit
Data Source
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AI summary
An organic light emitting diode (434) display device (100) includes a display unit (180) including pixels each configured by an organic light emitting diode (434), a power supply unit (190,260) configured to supply power for driving the display unit (180), a discharge unit (300) connected to the display unit (180) and configured to perform a discharge operation (S240) on a display driving voltage applied to the display unit (180), and a discharge control unit (400) configured to control enabling and disabling of the discharge unit (300) based on a power state of the organic light emitting diode (434) display device (100).