Electroluminescent Display Shielding Voltage Polarity
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Solution Overview
Problem
Electroluminescent displays experience non-uniform brightness due to noise in power supply voltages caused by internal or external electromagnetic waves, which distort the waveform of the power supply voltage.
Innovation Solution
An electromagnetic shield is arranged in parallel with the first power supply voltage lines, supplied with a specific voltage to attract and shield electromagnetic waves, preventing them from affecting the power supply voltage. This shield can be implemented using a conductive interconnection line or metal line, with a shielding voltage generator providing a second power supply voltage of opposite polarity to effectively neutralize electromagnetic interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If electromagnetic shield is added to shield power supply voltage lines, then noise in power supply voltage is reduced and brightness uniformity is improved, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The electromagnetic shield is merged with existing conductive interconnection lines or metal lines in the display structure, combining the shielding function with existing structural elements rather than adding completely separate components. This reduces the increase in device complexity while maintaining the noise shielding effect.
Solution Approach 2:
Existing conductive interconnection lines and metal lines in the display are made to serve dual functions: their original electrical connection function plus electromagnetic shielding function. By supplying opposite polarity voltages to these lines, they become effective shields against electromagnetic waves affecting power supply voltage lines.
2Object-affected harmful factors
If electromagnetic shield is arranged in parallel with power supply voltage lines, then electromagnetic wave shielding effectiveness is improved, but manufacturing precision requirements increase
Solution Approach 1:
The shielding structure is merged with existing conductive interconnection lines and metal lines that are already part of the manufacturing process. Since these lines are already precisely positioned for their electrical functions, utilizing them for shielding eliminates the need for separate shielding component positioning, thereby maintaining manufacturing precision while achieving effective shielding.
3Object-affected harmful factors
If shielding voltage generator is added to provide opposite polarity voltage, then electromagnetic wave attraction and shielding capability is improved, but device complexity increases
Solution Approach 1:
The shielding voltage generator is integrated into the existing power supply system architecture. The same power supply lines that deliver operational voltages to the display are also used to deliver shielding voltages of opposite polarity to conductive interconnection lines and metal lines. This multi-functional use of existing components avoids adding separate shielding voltage supply systems, thereby limiting the increase in device complexity.
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 solution effectively shields electromagnetic waves, preventing noise in the power supply voltage and thereby improving the uniformity of brightness in electroluminescent displays by isolating the power supply from external and internal electromagnetic interference.
Implementation Method 1
an electromagnetic shield adapted to shield a first power supply voltage line to prevent the occurrence of noise or the like on the power supply voltage due to internal or external electromagnetic waves
Data Source
AI summary
An electroluminescent display includes: a pixel region including devices arranged therein and adapted to emit light in response to a data signal; a scan driver adapted to supply a switching signal to a gate electrode of a first switching device; a data driver adapted to supply data information to a source electrode of the first switching device; a conductive power supply line adapted to supply a first power supply voltage to the pixel region, and an electromagnetic shield adapted to shield electromagnetic waves having electric or magnetic field characteristics. The electromagnetic shield is adapted to generate a second power supply voltage having a polarity opposite to that of the first power supply voltage.