Capacitor Line Voltage Shifting for Data Line Amplitude Reduction
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Solution Overview
Problem
Existing electrooptic devices, such as liquid crystal devices, face challenges in reducing the voltage amplitude of data lines while maintaining a simple circuit configuration, which is essential for achieving high-definition display and minimizing noise interference.
Innovation Solution
The proposed solution involves a driving circuit configuration that includes scanning lines, data lines, capacitor lines, and storage capacitors, where the voltage of the capacitor lines is alternately shifted to reduce the voltage amplitude of the data lines, allowing for high-definition display with reduced noise influence and a simplified circuit design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If storage capacitors are provided in parallel to pixel capacitors and capacitor lines are driven in synchronism with scanning line selection to reduce voltage amplitude, then voltage amplitude of data lines is reduced, but circuit configuration becomes complicated
Solution Approach 1:
The display panel is divided into multiple blocks, with each block containing pixel capacitors and storage capacitors connected in parallel. This segmentation allows the voltage reduction technique to be applied locally to each block without requiring complex global circuit modifications. The capacitor lines are divided into first capacitor lines and second capacitor lines corresponding to different blocks, enabling independent voltage control for each block.
Solution Approach 2:
The patent implements dynamic voltage control by switching between different voltage levels (first voltage and second voltage) for capacitor lines based on the selected scanning line. The voltage of capacitor lines is changed from a first voltage level to a second voltage level when a scanning line is selected, and then held at the first voltage level when another scanning line is selected. This dynamic switching reduces voltage amplitude without requiring complex circuit configurations.
2Reliability
If voltage amplitude of data lines is reduced to achieve high-definition display, then noise influence is minimized, but circuit configuration complexity increases
Solution Approach 1:
The display panel is divided into multiple blocks, with each block containing pixel capacitors and storage capacitors connected in parallel. This segmentation allows the voltage reduction technique to be applied locally to each block without requiring complex global circuit modifications. The capacitor lines are divided into first capacitor lines and second capacitor lines corresponding to different blocks, enabling independent voltage control for each block.
Solution Approach 2:
The patent implements dynamic voltage control by switching between different voltage levels (first voltage and second voltage) for capacitor lines based on the selected scanning line. The voltage of capacitor lines is changed from a first voltage level to a second voltage level when a scanning line is selected, and then held at the first voltage level when another scanning line is selected. This dynamic switching reduces voltage amplitude without requiring complex circuit configurations.
Data Source
AI summary
A driving circuit of an electrooptic device includes: a plurality of scanning lines; a plurality of data lines; first and second capacitor lines; a common electrode; pixels; a scanning-line driving circuit; a capacitor-line driving circuit; and a data-line driving circuit. The pixels each include: a pixel switching element; a pixel capacitor disposed between the pixel switching element and the common electrode; and a storage capacitor. When the one scanning line is selected, the capacitor-line driving circuit shifts the voltage of a first (or second) capacitor line corresponding to one scanning line to one of higher and lower levels from a predetermined voltage by a predetermined value, and holds the predetermined voltage after a scanning line apart from the one scanning line by a predetermined number of lines is selected until the one scanning line is selected again.