OLED Voltage Controller With Dual Supply Selection
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Solution Overview
Problem
Existing organic light emitting display devices face challenges in maintaining consistent voltage levels across pixels due to potential malfunctions or variations in voltage supply units, which can affect display performance and reliability.
Innovation Solution
The organic light emitting display device incorporates a voltage controller that supplies compensation signals to voltage supply units to adjust voltage levels, ensuring consistency even if the supply units are replaced, and includes a selection unit to alternate between two voltage levels for emission and non-emission periods, using DC-DC converters and flexible printed circuit boards for efficient power distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single voltage supply unit is used to provide power to pixels, then the device structure is simple, but voltage level variations and malfunctions cannot be compensated, affecting display performance consistency
Solution Approach 1:
The patent divides the pixel array into multiple regions (first region and second region), each with dedicated voltage supply units (first and second voltage supply units). Each voltage supply unit independently provides voltage to its corresponding region, allowing localized compensation and maintenance of voltage levels, thereby ensuring display performance consistency without requiring a complete system redesign
Solution Approach 2:
The patent introduces a voltage controller that receives voltage level information from voltage detection units and generates compensation signals accordingly. The voltage controller adjusts the output voltage of the voltage supply units based on detected variations, creating a closed-loop feedback system that automatically compensates for voltage deviations and maintains consistent display performance
2Ease of repair
If voltage supply units are made replaceable for maintenance, then ease of repair is improved, but voltage level variations may occur affecting display consistency
Solution Approach 1:
The patent incorporates voltage detection units that continuously monitor voltage levels before actual display operations. When voltage variations are detected, the system proactively generates compensation signals to adjust voltage supply, preventing display inconsistencies before they occur. This preliminary detection and compensation mechanism ensures that even after replacement, voltage levels are quickly stabilized
Solution Approach 2:
The voltage controller receives real-time voltage level information from detection units and dynamically adjusts the output of voltage supply units through compensation signals. This feedback mechanism automatically corrects voltage deviations caused by replacement operations, maintaining display consistency without requiring manual calibration
3Use of energy by moving object
If alternating voltage levels are supplied for emission and non-emission periods, then power consumption is optimized, but voltage switching complexity increases
Solution Approach 1:
The patent implements periodic switching between different voltage levels (first voltage and second voltage) corresponding to emission and non-emission periods. The voltage supply units alternately provide different voltage levels in sync with the display refresh cycle, enabling the pixels to operate at lower voltage during non-emission periods while maintaining high voltage during emission, thereby optimizing power consumption through rhythmic voltage modulation
Solution Approach 2:
The patent introduces a switching controller that dynamically adjusts voltage supply based on display operation states. The switching controller receives control signals and dynamically switches between different voltage output modes, enabling adaptive voltage supply that responds to real-time display requirements. This dynamic control allows the system to optimize power consumption while managing switching complexity through automated control logic
Data Source
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AI summary
An organic light emitting display device includes a pixel unit (20), a first voltage supply unit (110), a second voltage supply unit (210), and a selection unit (120). The pixel unit (20) includes a plurality of pixels (10) coupled to power lines (310, 320). The first voltage supply unit (110) is configured to output a first voltage (ELVDD1). The second voltage supply unit (210) is configured to output a second voltage (ELVDD2). The selection unit (120) is configured to supply any one of the first and second voltages (ELVDD1, ELVDD2) to the pixels (10) through the power lines (310, 320).