Voltage Control Circuit for Common Voltage Ripple Suppression
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Solution Overview
Problem
During the display process, the gate drive signal couples with the common voltage signal, causing ripple in the common voltage, which increases the amplitude and results in horizontal white lines on the display panel due to inadequate compensation and amplification.
Innovation Solution
A voltage control circuit comprising a comparison sub-circuit and a switching sub-circuit that determines whether the feedback voltage is within a set reference voltage range, adjusting the output voltage to maintain the initial or replacement voltage, preventing excessive input to the display panel and thus avoiding white lines.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the common voltage feedback signal is compensated and amplified to avoid fading and checkerboard afterimages, then the voltage uniformity is improved, but the ripple amplitude increases causing horizontal white lines
Solution Approach 1:
The patent introduces a ripple removal circuit as an intermediary component between the feedback voltage input and the compensation amplification stage. This circuit specifically targets and removes ripple components from the feedback voltage before it undergoes compensation and amplification, thereby preventing the ripple amplitude from increasing while still maintaining voltage uniformity through the necessary compensation.
Solution Approach 2:
The patent extracts and removes the harmful ripple component from the feedback voltage signal using the ripple removal circuit. By separating and eliminating the ripple component before amplification, the system maintains the beneficial compensation effect while preventing the amplification of harmful ripples that would cause horizontal white lines.
2Speed
If the gate drive signal is used for high-speed switching control, then the switching speed is improved, but the coupling with common voltage signal increases causing ripple
Solution Approach 1:
The patent converts the harmful coupling effect between the gate drive signal and common voltage signal into a beneficial filtering opportunity. The ripple removal circuit is specifically designed to target the frequency characteristics of the coupled ripple, transforming what would be a harmful interference into a detectable and removable signal component that can be eliminated without affecting the legitimate common voltage control function.
3Illumination intensity
If the common voltage is amplified to compensate for far-end fading, then the voltage level is improved, but the ripple is further amplified causing display defects
Solution Approach 1:
The patent applies preliminary action by removing ripples from the feedback voltage before the compensation and amplification process. The ripple removal circuit operates in advance to clean the feedback signal, ensuring that when the voltage is subsequently amplified to compensate for far-end fading, only the legitimate voltage components are amplified while the harmful ripple components have already been eliminated, thus preventing display defects.
Data Source
AI summary
A voltage control circuit and a method of controlling the same, and a display device are provided. The comparison sub-circuit is coupled to a first reference voltage end, a second reference voltage end, a feedback voltage end and a comparison output end which is coupled to the switching sub-circuit. The switching sub-circuit is further coupled to an output voltage end, an initial voltage end and a replacement voltage end. The comparison sub-circuit determines whether a voltage of the feedback voltage end is between the first reference voltage and the second reference voltage. The switching sub-circuit transmits a voltage of the initial voltage end to the output voltage end in response to a first control signal of the comparison output end; transmit a voltage of the replacement voltage end to the output voltage end in response to a second control signal of the comparison output end.