Electrooptical Device Voltage Output Selection Circuit Power Reduction
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Solution Overview
Problem
Existing electrooptical devices with liquid crystal elements face increased power consumption when applying a precharge signal to all data lines simultaneously, particularly as resolution increases, leading to potential display quality deterioration due to insufficient signal writing time.
Innovation Solution
An electrooptical device with a voltage output selection unit that selectively connects and disconnects data lines to a data line drive unit in specific regions, allowing the precharge voltage to be applied only to the display region, thereby reducing power consumption without affecting display quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a precharge signal is simultaneously applied to all data lines to improve display quality, then display quality is improved, but power consumption significantly increases
Solution Approach 1:
The patent segments the data lines into two groups: first data lines (display region) and second data lines (non-display region). The voltage output selection unit selectively connects only the first data lines to the data line drive unit during precharge, while disconnecting the second data lines. This segmentation allows precharge signal to be applied only where needed, reducing power consumption while maintaining display quality.
Solution Approach 2:
The patent applies different treatment to different regions of the data lines based on their function. The first data lines in the display region receive the precharge signal to ensure proper display operation, while the second data lines in the non-display region (covered by light shielding layer) do not receive the precharge signal. This local differentiation optimizes power consumption without affecting display performance.
2Measurement precision
If the number of data lines is increased to improve resolution, then resolution is improved, but power consumption significantly increases
Solution Approach 1:
The patent divides all data lines into first data lines (corresponding to display region pixels) and second data lines (corresponding to non-display region). The voltage output selection unit connects only the first data lines to the data line drive unit during precharge operation. This segmentation ensures that even when the total number of data lines is increased for higher resolution, only the necessary subset receives the power-consuming precharge signal, thereby controlling power consumption growth.
Solution Approach 2:
The patent differentiates the treatment of data lines based on their spatial location and functional relevance. Data lines corresponding to the display region (first data lines) receive precharge signal for proper pixel operation, while data lines corresponding to non-display regions (second data lines) are disconnected during precharge. This local quality differentiation allows the system to support higher resolution without proportionally increasing power consumption.
3Reliability
If precharge signal is applied to all data lines including non-display regions, then display quality is maintained, but power consumption increases unnecessarily
Solution Approach 1:
The patent extracts the unnecessary precharge operation from non-display regions. The voltage output selection unit disconnects the second data lines (non-display region) from the data line drive unit during precharge, effectively removing the wasteful energy consumption associated with charging capacitors in regions that are not used for display. Only the first data lines in the display region receive the precharge signal.
Solution Approach 2:
The patent applies precharge signal only to the local region where it is functionally necessary (display region), while excluding it from non-display regions. The voltage output selection unit selectively connects first data lines and disconnects second data lines based on their functional relevance, thereby eliminating unnecessary energy loss in non-display areas while preserving display quality.
Data Source
AI summary
An increase in power consumption is suppressed even in a case of applying a precharge signal to all data lines at the same time. A voltage output selection circuit that is connected to a data line drive circuit in an input stage and is connected to data lines in an output stage is provided. The voltage output selection circuit selects connection and non-connection between the data lines and the data line drive circuit when a precharge voltage is applied. A control circuit controls the voltage output selection circuit such that connection between the data lines and the data line drive circuit is selected in a first region in which an image is displayed, and non-connection between the data lines and the data line drive circuit is selected in a second region covered with a light shielding layer.