Voltage Modulator for Display Panel Luminance Uniformity
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Solution Overview
Problem
Display devices with flexible circuit boards often experience varying power supply voltages across different areas due to resistance differences at connection points, leading to inconsistent luminance and unwanted image brightness variations.
Innovation Solution
A display device design that includes a voltage modulator system using reference voltages and switch control signals to adjust power supply voltages across pixels, accounting for resistance variations at connection points between flexible circuit boards and the display panel, ensuring uniform voltage distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If multiple flexible circuit boards are used to supply power to different areas of the display panel, then power can be distributed to multiple regions, but resistance differences at connection points cause voltage variations and luminance inconsistencies
Solution Approach 1:
The patent applies local quality by configuring different voltage modulators at different locations of the display panel, where each modulator is tailored to compensate for the specific resistance characteristics of its local connection portion. This allows each region to receive appropriately adjusted voltage, ensuring uniform luminance across the entire display area despite variations in connection resistance.
Solution Approach 2:
The patent implements parameter changes by dynamically adjusting the voltage output of each voltage modulator based on the resistance value of its corresponding connection portion. The signal controller modifies voltage parameters in real-time to compensate for resistance variations, thereby maintaining consistent power supply voltage across different areas of the display panel.
2Ease of manufacture
If connection portions are manufactured with standard processes, then manufacturing is simple and cost-effective, but resistance variations occur leading to power supply voltage inconsistencies
Solution Approach 1:
The patent employs feedback mechanisms where the signal controller receives information about connection resistance and adjusts the voltage output accordingly. This closed-loop control compensates for resistance variations introduced by standard manufacturing processes, ensuring reliable and consistent power supply voltage without requiring precision manufacturing.
Solution Approach 2:
The voltage modulators perform self-adjustment based on their local connection characteristics, automatically compensating for resistance variations without requiring external intervention or complex manufacturing processes. Each modulator serves itself by adapting to its specific connection environment.
3Manufacturing precision
If voltage modulation is applied to compensate for resistance differences, then voltage uniformity is improved, but device complexity increases due to additional voltage modulators and control circuits
Solution Approach 1:
The patent segments the power supply system into multiple independent voltage modulators, each responsible for a specific region of the display panel. This segmentation allows for localized voltage compensation without requiring a complex centralized control system, as each modulator operates semi-independently based on its local connection characteristics.
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 ensures consistent power supply voltage across the display panel, preventing luminance inconsistencies and maintaining desired image brightness levels by compensating for resistance differences at connection points.
Implementation Method 1
a voltage modulator configured to generate a second power supply voltage of a low level with a division voltage using the reference voltage
Implementation Method 2
The display panel and the circuit board may be connected to each other by a plurality of flexible circuit boards, and the power source voltage may be provided to the display panel through a plurality of flexible circuit boards
Data Source
AI summary
A display device includes: a display panel including a plurality of pixels; a circuit board including: a power supply configured to output a reference voltage; and a signal controller; a connecting member electrically connecting the display panel and the circuit board; and a voltage modulator configured to generate a second power supply voltage of a low level with a division voltage using the reference voltage according to a switch control signal from the signal controller and to supply the second power supply voltage to the plurality of pixels.