Liquid Crystal Display Driving Circuit with Integrated Shift Register
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Solution Overview
Problem
Liquid crystal display devices face limitations in design flexibility and internal gate line delay due to external circuit-driven voltage, making it difficult to precisely adjust signal levels and leading to potential malfunction of shift registers.
Innovation Solution
A driving circuit is integrated into the liquid crystal display device, featuring a clock generation unit and a DC and AC level amplification unit to adjust and amplify signal levels, which are then inputted into the shift register, compensating for losses and improving design flexibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If external circuit drives the voltage for the liquid crystal display, then the device structure is simple, but the design flexibility is limited and signal level adjustment is imprecise
Solution Approach 1:
The patent merges the driver IC with the liquid crystal panel by integrating a shift register unit directly into the panel structure. This integration allows the panel to generate its own gate signals internally, improving design flexibility and adaptability while maintaining a relatively simple overall structure through functional consolidation rather than adding separate external circuits.
2Measurement precision
If external circuit drives the voltage for the liquid crystal display, then the circuit structure is simple, but the signal level adjustment precision is insufficient
Solution Approach 1:
The patent implements dynamic signal level adjustment through the shift register unit, which can vary signal levels based on different operating conditions and panel characteristics. The circuit includes multiple voltage levels (VGH, VGL, VDD) that can be dynamically selected and adjusted to achieve precise signal control adaptability to different liquid crystal panel requirements.
3Adaptability or versatility
If shift register is installed in liquid crystal panel, then design flexibility is improved, but internal gate line delay and signal loss occur
Solution Approach 1:
The patent introduces a level shifter unit as an intermediary component between the shift register unit and the gate lines. This level shifter compensates for signal degradation by boosting signal levels and adjusting voltage transitions, thereby maintaining signal stability and reliability while enabling the benefits of integrated shift register design.
4Adaptability or versatility
If shift register is installed in liquid crystal panel, then design freedom is improved, but malfunctions may occur due to insufficient voltage control
Solution Approach 1:
The patent employs parameter changes by providing multiple controllable voltage parameters (VGH, VGL, VDD) that can be adjusted to optimize performance and prevent malfunctions. The circuit includes voltage control circuits that regulate these parameters to ensure stable operation of the shift register and level shifter, adapting to different operating conditions and panel characteristics.
Data Source
AI summary
Disclosed is a liquid crystal display device including a liquid crystal panel having a shift register therein and an interface circuit for adjusting DC and AC levels, for compensating for a loss caused by elements and a resister of the shift register. A driving circuit of the liquid crystal display device includes a clock generation unit outputting a first clock signal as a gate clock signal, a second clock signal as an inverse signal of the first clock signal, and a start pulse, and a DC and AC level amplification unit for amplifying the first and second clock signals and the start pulse after adjusting DC and AC levels of the first and second clock signals and the start pulse, and outputting the first and second clock signals and the start pulse to the shift register.