Display Panel Control Circuit with Separate Slope Resistors
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Solution Overview
Problem
Existing display panel control circuits struggle to set different slopes for rising and falling gate shaping waveforms without increasing complexity or cost, as they often rely on a single resistor for both processes, which complicates independent control and can lead to parasitic capacitance effects affecting pixel grayscale.
Innovation Solution
A display panel control circuit design that includes separate voltage rising and falling resistors, along with diodes to control the direction of current flow, allowing for independent setting of rising and falling slopes without the need for additional high-voltage switches, thereby simplifying the setting process and reducing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single resistor is used for both rising and falling gate shaping, then the circuit structure is simple, but the rising and falling slopes cannot be set differently
Solution Approach 1:
The patent divides the gate shaping function into separate rising path and falling path, each with its own resistor (Rr for rising, Rf for falling). This segmentation allows independent control of rising and falling slopes while maintaining circuit simplicity through shared components like the capacitor C and voltage source VDD.
Solution Approach 2:
Different resistors are assigned to different functional paths: Rr controls the rising slope by limiting charging current, while Rf controls the falling slope by limiting discharging current. This local differentiation enables independent optimization of each transition phase without affecting the other.
2Adaptability or versatility
If separate voltage rising and falling resistors are used, then rising and falling slopes can be set differently, but the circuit complexity increases
Solution Approach 1:
The patent merges the rising and falling control paths by sharing common components: the same capacitor C is used for both charging and discharging, and the same voltage source VDD supplies both paths. This combining approach reduces overall component count and circuit complexity while maintaining separate slope control through dedicated resistors Rr and Rf.
Solution Approach 2:
The capacitor C serves dual functions: it charges through Rr during the rising phase and discharges through Rf during the falling phase. The voltage source VDD also serves both paths. This multi-functionality reduces the total number of components needed while enabling independent slope control.
3Adaptability or versatility
If additional high-voltage switches are added to control separate resistors, then rising and falling slopes can be independently controlled, but the cost and complexity increase significantly
Solution Approach 1:
The circuit uses the inherent properties of the capacitor and resistors to automatically achieve separate slope control. The capacitor naturally charges through Rr and discharges through Rf based on the switching state, eliminating the need for additional active control elements like high-voltage switches. The circuit self-regulates the rising and falling edges through passive component characteristics.
Solution Approach 2:
The patent replaces expensive high-voltage switch components with simple, low-cost passive elements (resistors and capacitor) that can be easily manufactured and integrated. The resistors Rr and Rf are standard passive components that are inexpensive and reliable, significantly reducing manufacturing cost compared to active high-voltage switching devices.
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
This design enables easy and cost-effective setting of distinct slopes for rising and falling gate shaping waveforms, reducing the impact of parasitic capacitance and improving pixel grayscale performance by using a voltage adjustment unit and direction control unit with external resistors and diodes.
Implementation Method 1
a first diode having a cathode coupled to the switching node and an anode coupled to a voltage rising node, and a second diode having an anode coupled the switching node and a cathode coupled to a voltage falling node
Data Source
AI summary
The present invention provides a display panel control circuit, including: a voltage adjustment unit including a high side switch coupled between an output terminal and a high voltage source, a low side switch coupled between the output terminal and a low voltage source, and a voltage adjustment switch coupled between the output terminal and a switching node; a direction control unit, including a first diode having a cathode coupled to the switching node and an anode coupled to a voltage rising node, and a second diode having an anode coupled the switching node and a cathode coupled to a voltage falling node; a voltage rising resistor coupled between the voltage rising node and a shaping voltage source; and a voltage falling resistor coupled between the voltage falling node and the shaping voltage source.