EL Display Driving Circuit Prevents Initial Blinking
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Solution Overview
Problem
Conventional electro-luminescence display panels experience an initial blinking phenomenon due to the sudden application of driving voltage, which forms a current path and causes unintended light emission before data signals are applied.
Innovation Solution
A method and apparatus that control the connection between the cathode and ground voltage source using a switching device and latch, opening the path until the power is turned on and at least one frame is completed, then shorting it to prevent initial blinking by utilizing a vertical synchronizing signal to manage data delivery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If driving voltage is applied to the pixel matrix at power-on, then the EL cells can emit light according to data signals, but an initial blinking phenomenon occurs due to unintended current path formation before data signals are supplied
Solution Approach 1:
The cathode is preliminarily disconnected from the ground voltage source before power-on through the latch circuit. This preliminary action prevents the formation of unintended current paths during the initial power-on phase, thereby eliminating the initial blinking phenomenon while maintaining the ability to emit light normally after data signals are supplied
Solution Approach 2:
A latch circuit is introduced as an intermediary component between the cathode and the ground voltage source. This latch circuit is controlled by the vertical synchronizing signal to selectively connect or disconnect the cathode from ground, thereby mediating the current path formation to prevent initial blinking while allowing normal operation
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
Prevents the initial blinking phenomenon by ensuring no current path is formed until data is supplied, allowing controlled light emission and improved display performance.
Implementation Method 1
control the connection between the cathode and ground voltage source using a switching device and latch
Implementation Method 2
an electro-luminescence (EL) display panel, The EL display panel is a self-luminous device capable of light-emitting a phosphorous material by a re-combination of electrons with holes
Data Source
AI summary
A method and apparatus for driving an electro-luminescence display panel capable of preventing an initial blinking phenomenon occurring at a power application is disclosed. In the method, a first electrode of the EL cell and a ground voltage source are opened during a first period from a turn-on time of a power source to shut off a current path of the EL cells. Then, the first electrode of the pixel matrix and the ground voltage source is shorted during a second period to form a current path such that the EL cells are light-emitted in accordance with a data supplied to the pixel matrix.