Integrated LCD Driving Circuit Simplifies Layout
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Solution Overview
Problem
The existing LCD driving circuits have a complex configuration of conductive lines for power supply and signal transmission due to the presence of multiple booster circuits and interface circuits, which complicates the layout and efficiency of the driving circuit.
Innovation Solution
A simplified driving circuit design featuring a single booster circuit and system interface circuit, where the power supply device provides voltage to the system driver, and the system control device generates signals to drive both the LCD panel and backlight, with the system driver incorporating a gate driver, source driver, latch circuit, gamma adjustment, and analog/digital transform circuit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple booster circuits and interface circuits are used to drive both the backlight and panel, then the driving function is comprehensive, but the layout of conductive lines becomes complicated and the device complexity increases
Solution Approach 1:
The patent combines the backlight driving circuit and panel driving circuit into a single integrated driving circuit. The system driver includes a booster circuit that generates high voltage for the backlight, while also incorporating a panel interface circuit that provides control signals and data signals to the LCD panel. This merging eliminates the need for separate booster circuits and interface circuits, thereby simplifying the conductive line layout and reducing device complexity while maintaining comprehensive driving functionality.
Solution Approach 2:
The system driver is designed as a multi-functional integrated circuit that performs multiple functions: it includes a booster circuit for backlight driving, a panel interface circuit for signal transmission, and control logic for coordinating both backlight and panel operations. This universal design allows a single circuit to replace multiple specialized circuits, reducing the overall complexity of the LCD driving system.
2Ease of manufacture
If separate backlight driving circuit and panel driving circuit are used, then the functional modules are independent, but the overall circuit configuration becomes complex
Solution Approach 1:
The patent merges the previously separate backlight driving circuit and panel driving circuit into a single integrated system driver. The system driver contains both the booster circuit for backlight control and the panel interface circuit for LCD panel control, along with integrated control logic. This integration maintains functional independence through internal circuit design while eliminating the complexity of having two separate circuits with their own independent power supply connections and control signal paths.
Data Source
AI summary
A driving circuit of a liquid crystal display (LCD) (23) includes a system driver (28), a power supply device (26) and a system control device (25). The power supply device provides a votage to the system driver. The system control device generates a control signal, a data signal, and a backlight driving signal, and applies them to the system driver. The system driver drives an LCD panel (21) and a backlight of the LCD according to the backlight driving signal, the data signal and the control signal. The configuration of the driving circuit is simple.