OLED Display Voltage Control via Feedback Coupling Member
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Solution Overview
Problem
Existing organic light emitting displays face issues with voltage drop due to the flexible printed circuit board (FPCB) between the power supply and the display panel, resulting in lower input voltage to the panel and reduced luminance.
Innovation Solution
An organic light emitting display design that includes a coupling member with first and second coupling portions, first and second coupling lines, and a feedback line to precisely control the output voltage by feeding back the voltage drop to the power supply, using a DC-DC converter as the power supply and attaching the coupling member to the display panel, which includes scan and data drivers for image display.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a flexible printed circuit board (FPCB) is used to connect the power supply and display panel, then the display panel can be supplied with power, but voltage drop occurs resulting in lower input voltage and reduced luminance
Solution Approach 1:
The patent implements a feedback mechanism where the voltage at the second coupling portion is measured and fed back to the power supply. The power supply uses this feedback information to adjust its output voltage, compensating for the voltage drop caused by the FPCB and coupling lines, thereby maintaining the required voltage level at the display panel and preventing luminance deterioration.
Solution Approach 2:
The patent replaces the simple mechanical electrical connection system with an intelligent control system. By substituting passive wiring with an active feedback control mechanism, the system can dynamically compensate for voltage drops and maintain optimal performance without requiring changes to the physical FPCB structure.
2Device complexity
If the coupling member is positioned outside the display panel, then the display panel structure is simplified, but the coupling lines become longer causing increased voltage drop
Solution Approach 1:
The feedback mechanism compensates for the increased voltage drop caused by longer coupling lines. By continuously monitoring the voltage at the second coupling portion and adjusting the power supply output accordingly, the system offset the additional voltage loss from the extended coupling lines while maintaining the simplified external power supply structure.
3Ease of manufacture
If the power supply is positioned outside the display panel, then the display panel can be manufactured separately, but the coupling member introduces additional voltage drop
Solution Approach 1:
The feedback control system compensates for the voltage drop introduced by the coupling member. This allows the power supply to be positioned outside the display panel for easier manufacturing and assembly, while the feedback mechanism ensures that the voltage drop across the coupling member does not degrade performance.
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 allows for precise control of output power voltage, preventing luminance deterioration by compensating for voltage drops and ensuring the display panel receives the required voltage, thereby maintaining target luminance levels.
Implementation Method 1
a feedback line transmitting the voltage of the second coupling portion to the power supply
Implementation Method 2
first and second coupling lines transmitting the first power supplied from the power supply to the respective first and second coupling portions
Data Source
AI summary
An organic light emitting display that includes a display panel, a power supply and a coupling member. The display panel includes scan lines, data lines, first power lines and a plurality of pixels. The power supply is positioned at the outside of the display panel, and supplies first power to the display panel through a coupling member. The coupling member includes first and second coupling portions respectively coupled to the power lines, first and second coupling lines transmitting the first power supplied from the power supply to the respective first and second coupling portions, and a feedback line transmitting the voltage of the second coupling portion to the power supply. Accordingly, it is possible to provide an organic light emitting display capable of precisely controlling the voltage of output power and preventing the deterioration of the luminance of a display panel.