Balance Resistor for Foldable Display Voltage Uniformity
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Solution Overview
Problem
Foldable display panels exhibit uneven display brightness due to differences in voltage values of power supply signals delivered to active areas on both sides of the folding axis, resulting from contact resistance and wiring resistance in the circuit board connections.
Innovation Solution
Incorporating a balance resistor on the circuit board to reduce the voltage difference between power supply lines, which are connected to the display panel, thereby improving the uniformity of display brightness by regulating the power supply voltage signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If multiple circuit boards and connectors are used to connect the power supply module to the display panel, then the power supply signal can be delivered to both sides of the folding axis, but contact resistance and wiring resistance cause voltage differences resulting in uneven display brightness
Solution Approach 1:
The patent introduces a balance resistor to adjust and equalize the voltage parameters in the power supply circuit. By adding this resistor in series with the power supply line, the voltage distribution across different circuit boards and connectors is optimized, compensating for the contact resistance and wiring resistance variations, thereby achieving uniform display brightness across the folding display panel.
2Ease of operation
If the circuit board assembly uses multiple connectors and power supply lines, then power can be distributed to both sides of the folding axis, but resistance in the connection paths causes voltage drop and brightness unevenness
Solution Approach 1:
The balance resistor serves as an intermediary element in the power supply circuit. It is introduced between the power supply module and the display panel to mediate the voltage distribution. This resistor compensates for the voltage drops caused by contact resistance and wiring resistance in the multiple connectors and power supply lines, ensuring uniform voltage delivery to both sides of the folding display panel.
3Ease of manufacture
If contact resistance and wiring resistance are present in the power supply lines, then the circuit board assembly can be constructed with multiple connectors, but these resistances cause voltage differences and reduce display brightness uniformity
Solution Approach 1:
The patent modifies the electrical parameters of the power supply circuit by adding a balance resistor. This resistor is carefully selected to compensate for the contact resistance and wiring resistance inherent in the multi-connector circuit board assembly. By adjusting this parameter, the overall voltage distribution is optimized, achieving uniform display brightness despite the presence of multiple connectors and associated resistances.
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 balance resistor effectively reduces voltage differences between power supply lines, enhancing the uniformity of display brightness across the foldable display panel, as demonstrated by increased uniformity values from 72.5% to 81.1% in brightness tests.
Implementation Method 1
Incorporating a balance resistor on the circuit board to reduce the voltage difference between power supply lines
Data Source
AI summary
According to the present disclosure, a display panel and a circuit board assembly are provided, and the circuit board assembly includes a first circuit board, a second circuit board, a third circuit board, a first connector and a second connector. The first circuit board is provided with a power supply module, a balance resistor and a plurality of first power supply lines. The balance resistor is connected to the power supply module and each of the first power supply lines. The second circuit board is provided with a plurality of second power supply lines, the third circuit board is provided with a first power connection line, the first power connection line is connected to the power supply module through the first connector, the first power connection line is further connected to each of the second power supply lines through the second connector.