Display Device Ripple Detection and Voltage Compensation
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Solution Overview
Problem
Liquid crystal display (LCD) devices experience degraded display quality and increased current consumption due to voltage ripples in the driving voltage, which existing technologies have not effectively addressed.
Innovation Solution
A display device with a ripple detection circuit and controller that count and adjust the driving voltage based on the frequency and size of ripples, changing the voltage level to a compensation or normal voltage level to mitigate ripple effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the driving voltage is increased to improve display quality, then the display quality is improved, but the current consumption increases
Solution Approach 1:
The patent implements dynamic adjustment of the driving voltage level based on real-time ripple detection. The controller continuously monitors ripple conditions and adjusts the voltage between a first level (for normal operation) and a second level (for ripple compensation), making the voltage level adaptive rather than static. This resolves the contradiction by only increasing voltage when necessary to compensate for ripples, rather than maintaining high voltage continuously which would increase power consumption.
Solution Approach 2:
The patent changes the voltage level parameter dynamically based on detected ripple conditions. When ripples exceed a threshold, the system switches from a normal voltage level to a compensated voltage level (higher by a predetermined amount). This parameter change allows the system to maintain good display quality during ripple conditions while minimizing power consumption during normal operation, thus resolving the trade-off between display quality and current consumption.
2Illumination intensity
If the driving voltage level is adjusted frequently to compensate for ripples, then the display quality is maintained, but the system complexity increases
Solution Approach 1:
The patent implements a feedback mechanism where the ripple detection circuit continuously monitors the driving voltage for ripple conditions and provides signals to the controller. The controller uses this feedback to determine when ripple compensation is needed and adjusts the voltage level accordingly. This closed-loop feedback system maintains display quality automatically without requiring complex manual intervention or overly sophisticated control algorithms, thus resolving the contradiction between maintaining quality and managing system complexity.
Solution Approach 2:
The patent divides the voltage control into discrete levels (first voltage level for normal operation, second voltage level for ripple compensation) rather than using continuous or finely-grained adjustment. The ripple detection and voltage adjustment are also segmented into distinct functional blocks (ripple detection circuit, counter, controller). This segmentation simplifies the overall system architecture while still achieving effective ripple compensation and quality maintenance.
3Reliability
If the ripple compensation voltage level is set high, then the ripple effect is reduced, but the power consumption increases
Solution Approach 1:
The patent uses dynamic voltage level switching rather than maintaining a constantly high compensation voltage. The controller adjusts the voltage level based on actual ripple conditions detected in real-time. When ripples are present, the higher compensation voltage is applied; when ripples are absent, the system returns to normal operating voltage. This dynamic approach ensures effective ripple compensation when needed while minimizing power consumption during normal operation, thus resolving the contradiction between compensation effectiveness and power consumption.
Data Source
AI summary
A display device includes a display unit, a driving voltage supply unit which supplies a driving voltage to the display unit, a ripple detection circuit which detects the number of times a ripple of the driving voltage is generated, and a controller which controls the driving voltage supply unit so as to change the driving voltage based on the number of times the ripple is generated.