Power Supply Circuit Voltage Trimming for Display Stability
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Solution Overview
Problem
Existing electronic devices with light emitting display panels face issues due to deviations in output voltages, leading to luminance variations and reduced display quality.
Innovation Solution
A power supply circuit that trims output voltages by generating control values based on input voltages, using voltage generators and sign determining circuits to adjust trimming voltages, and stores these values in memories for precise voltage control, ensuring consistent display performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If output voltage is increased to improve display brightness, then luminance intensity is improved, but voltage deviation increases causing luminance variations
Solution Approach 1:
The patent implements a feedback mechanism where the controller measures the actual output voltage and compares it with a reference voltage. Based on the voltage deviation detected, the controller adjusts the output voltage through trimming voltage generators to maintain stability. This closed-loop feedback system ensures that brightness is maintained at optimal levels while preventing voltage deviations that would cause luminance variations across the display panel.
Solution Approach 2:
The patent changes the voltage parameter dynamically by generating multiple trimming voltages (first trimming voltage, second trimming voltage, third trimming voltage) with different polarities and magnitudes. The controller selectively applies these trimming voltages to adjust the output voltage level, thereby maintaining stable display performance under varying operating conditions without causing luminance non-uniformity.
2Reliability
If trimming voltage is applied to stabilize output voltage, then voltage stability is improved, but device complexity increases
Solution Approach 1:
The patent segments the voltage trimming function into multiple independent trimming voltage generators (first trimming voltage generator, second trimming voltage generator, third trimming voltage generator). Each generator produces a specific trimming voltage with defined characteristics. This segmentation allows the controller to selectively activate only the necessary trimming voltages based on the detected deviation, stabilizing output voltage while managing circuit complexity through modular design.
Solution Approach 2:
The patent implements dynamic control where the controller continuously monitors output voltage and adaptively selects which trimming voltage generators to activate. The trimming voltages are not constantly applied but dynamically adjusted based on real-time voltage deviation detection. This dynamic approach maintains voltage stability while minimizing unnecessary circuit activity, thereby controlling overall device complexity.
Data Source
AI summary
Disclosed is an electronic device, which includes a display panel, a data driving circuit, a scan driving circuit, a signal control circuit, and a power supply circuit that trims a first voltage and a second voltage based on a first control value generated based on the first voltage and the second voltage, and the power supply circuit includes a controller that generates the first control value, a sign determining circuit that determines a sign of the first control value based on the first voltage and the second voltage, a plurality of voltage generators that generate a trimming voltage of the first control value based on the first voltage and the second voltage, and a first memory that stores the first control value, and the first control value is a value for controlling the sign determining circuit and each of the plurality of voltage generators.