Vertical Drive Circuit CS Latch for Display Mode Switching
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Solution Overview
Problem
Liquid crystal display devices face difficulties in performing normal coupling operations during switching modes like 1H inversion, 1F inversion, and External Vsync, leading to abnormal display issues and increased circuit complexity.
Innovation Solution
The display device incorporates a vertical drive circuit with a CS latch unit that allows reverse polarity potential to be applied to additional potential lines before adding additional potential, ensuring suitable voltage is provided to pixel electrodes, thereby stabilizing image quality during mode transitions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If coupling operation is performed during switching modes (1H inversion, 1F inversion, External Vsync), then display switching capability is improved, but coupling operation fails and display abnormalities occur
Solution Approach 1:
The patent applies preliminary action by performing a precharge operation on the additional potential lines before the coupling operation during mode switching. The precharge potential is set to match the potential of the pixel electrode at that moment, ensuring that when coupling occurs, there is no potential conflict or abnormality. This preparatory step resolves the contradiction by enabling reliable coupling operations during display switching modes.
2Reliability
If additional drive mechanisms are added to enable coupling during switching modes, then display switching reliability is improved, but circuit complexity increases
Solution Approach 1:
The patent merges the precharge function into the existing vertical drive circuit's coupling operation sequence. Rather than adding a separate precharge circuit, the invention utilizes the existing CS latch and coupling circuitry to perform both precharge and coupling operations in a unified manner. This integration achieves reliable coupling during switching modes without increasing circuit complexity.
Solution Approach 2:
The vertical drive circuit is designed to perform multiple functions: normal drive operation, precharge operation, and coupling operation during mode switching. By making the drive circuit universal and capable of adapting to different operating modes through control signals, the patent avoids the need for separate dedicated circuits for each function, thereby maintaining circuit simplicity while improving reliability.
3Adaptability or versatility
If coupling operation is performed during switching modes, then display mode versatility is improved, but image quality stability deteriorates
Solution Approach 1:
The precharge operation performed before coupling ensures that the additional potential lines are precharged to the correct potential level that matches the pixel electrode potential at that moment. This preliminary action prevents potential conflicts during coupling, ensuring stable image quality across different display modes including 1H inversion, 1F inversion, and External Vsync modes.
Data Source
AI summary
A display device includes a display unit in which pixels are arranged in a matrix state and a drive circuit selecting respective pixels in the display unit by each row and giving additional potential to pixel electrodes of the pixels by using coupling, in which the drive circuit has a function of allowing the reverse polarity of potential added to pixel electrodes to be a potential which can add suitable voltage to additional potential lines in a frame before adding the additional potential.