Driving Voltage Trimmer for Display Devices
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Solution Overview
Problem
Existing display devices, such as LCDs and OLEDs, face issues with display quality due to an increased gap between driving voltages or between driving voltages and target driving voltages, leading to deteriorated performance.
Innovation Solution
A driving voltage generating device comprising a driving voltage setting unit, a driving voltage trimmer, and a DC to DC converter, which receives initially set and finely adjusted data to output a control signal for generating a driving voltage, using a transistor to adjust current flow and feedback sensing units to refine the voltage, thereby minimizing deviations from target values.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a conventional driving voltage generator is used, then the device structure is simple, but the driving voltage deviation from target value is large
Solution Approach 1:
The voltage generation system is divided into three functional modules: a DC-DC converter for coarse voltage adjustment, a digital-to-analog converter for fine voltage adjustment, and a feedback unit for monitoring. This segmentation allows each module to handle specific precision requirements, achieving high overall precision without requiring every component to be overly complex.
Solution Approach 2:
The system employs dynamic adjustment mechanisms where the digital-to-analog converter can modify the feedback voltage in real-time based on the difference between actual and target driving voltages. This dynamic fine-tuning capability enables the system to compensate for deviations and maintain high voltage precision adaptively.
2Reliability
If the driving voltage is adjusted with limited precision, then the device complexity is low, but the display quality deteriorates
Solution Approach 1:
A feedback unit monitors the actual driving voltage and compares it with the target value, generating an error signal that feeds back to the digital-to-analog converter. This closed-loop feedback mechanism enables continuous correction of voltage deviations, ensuring high display quality and reliability while keeping the adjustment mechanism manageable through automated control.
Solution Approach 2:
The system changes the parameter of feedback voltage dynamically through the digital-to-analog converter, adjusting it in discrete steps based on the error signal. This parameter modification approach allows for precise voltage control without requiring complex continuous adjustment mechanisms, balancing reliability with acceptable complexity.
3Adaptability or versatility
If a single-stage voltage generation is used, then the device complexity is low, but the voltage adjustment range and precision are limited
Solution Approach 1:
The voltage generation is segmented into two stages: a first stage using a DC-DC converter for coarse adjustment over a wide range, and a second stage using a digital-to-analog converter for fine adjustment with high precision. This multi-stage segmentation expands the overall adjustment range while maintaining manageable complexity through modular design.
Solution Approach 2:
The first stage performs excessive action by providing broad coarse adjustment coverage, while the second stage performs partial action for precise fine-tuning. This division of labor allows the system to achieve wide adjustment range and high precision without requiring every stage to be overly complex, as each stage is optimized for its specific function.
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 allows for precise adjustment of driving voltages, reducing deviations and improving display quality by ensuring driving voltages are closer to target values, thus enhancing the accuracy and consistency of gamma curves in display devices.
Implementation Method 1
A DC to DC converter generates the driving voltage based on the control signal and an input voltage
Implementation Method 2
The driving voltage trimmer may include a transistor allowing different currents to flow depending on the finely adjusted data
Implementation Method 3
The feedback sensing unit may include first and second resistors connected in series with the output terminal
Data Source
AI summary
A driving voltage generating device, a display device including the same, and a method of generating a driving voltage are provided. The driving voltage generating device includes a driving voltage setting unit receiving initially set data on a driving voltage and a feedback voltage and outputting a control signal, a driving voltage trimmer receiving finely adjusted data on the driving voltage and adjusting the feedback voltage, and a DC to DC converter generating the driving voltage based on the control signal and an input voltage.