Adaptable Charge Pump for Display Driving Current
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Solution Overview
Problem
Existing display driving integrated circuits (DDIs) face challenges in manufacturing due to the need for multiple charge pump structures to handle varying driving currents, leading to increased costs and complexity.
Innovation Solution
A single structure charge pump that operates in both low-current and high-current modes, using a mode switch and control switch to adjust output voltage based on switching signals, allowing the same charge pump to handle different current requirements without the need for separate structures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a charge pump is designed for high driving current, then it can handle large current demands, but the output voltage decreases
Solution Approach 1:
The charge pump circuit dynamically switches between different operating modes (first mode and second mode) based on the required driving current. The mode switch changes the connection configuration of capacitors and switches, allowing the circuit to adapt its characteristics: in the first mode it operates for high current with lower voltage, in the second mode it operates for low current with higher voltage, thus resolving the contradiction between current capacity and voltage level
Solution Approach 2:
The invention changes the operational parameters of the charge pump by switching between different modes. Each mode has different capacitor connections and switching configurations, which changes the effective capacitance and voltage multiplication ratio. This parameter change allows the same hardware to provide different voltage-current characteristics suitable for different display panel sizes
2Power
If multiple charge pump structures are used to handle varying current requirements, then current driving capacity is improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The charge pump is designed as a universal circuit that can perform multiple functions through a single structure. By incorporating mode switches and multiple capacitors that can be reconfigured, one charge pump circuit serves both as a high-current pump and a high-voltage pump, eliminating the need for separate charge pump structures for different current requirements
Solution Approach 2:
The invention merges the functionality of multiple charge pump structures into a single unified circuit. The first and second charge pumps are combined with mode switches and control logic, allowing them to operate as one integrated system that adapts to different current demands, thereby reducing device complexity and manufacturing cost
3Temperature
If a charge pump is designed for low driving current, then output voltage is maintained at high level, but it cannot handle high current demands
Solution Approach 1:
The charge pump dynamically adjusts its operating characteristics by switching between modes. When high voltage is needed, the circuit configures itself in the second mode with appropriate capacitor connections for voltage multiplication. When high current is needed, it switches to the first mode, maintaining the high voltage capability while increasing current delivery through reconfigured capacitor connections
Data Source
AI summary
A display driving integrated circuit is provided which drives a plurality of gate lines included in a display panel. The display driving integrated circuit includes: a charge pump configured to change a voltage from an external power source to generate an output voltage; and a gate line driver configured to drive the plurality of gate lines based on the output voltage. The charge pump may operate in one of a low-current mode and a high-current mode based on a size of the display panel.