Display Panel Drive Circuit Share Line Power Reduction
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Solution Overview
Problem
Display panels face high power consumption due to the need to charge distributed capacitance in data lines, which increases the operating temperature and affects the normal operation of the source driving circuit, especially at higher refresh rates.
Innovation Solution
A driving circuit for display panels that includes a share line, a power supply circuit, and switch units to connect data lines to a share voltage, neutralizing charges and reducing voltage variation, thereby reducing power consumption and charging time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the source driving circuit charges the data lines directly, then the data lines can be driven, but the power consumption increases and operating temperature rises
Solution Approach 1:
A share line is introduced as an intermediary between the power supply circuit and the data lines. The share line receives a share voltage from the power supply circuit and distributes it to multiple data lines through switch units, thereby reducing the direct charging burden on the source driving circuit and lowering its power consumption and operating temperature.
Solution Approach 2:
The charging function is segmented into two parts: the power supply circuit charges the share line, and then switch units transfer the charge to individual data lines as needed. This segmentation allows the source driving circuit to focus only on driving operations rather than both charging and driving, reducing its power consumption.
2Productivity
If the source driving circuit charges the distributed capacitance of data lines, then the data lines can transmit signals, but the charging time increases
Solution Approach 1:
The share line is pre-charged with a share voltage by the power supply circuit before the data lines need to be driven. When a data line needs to be updated, the switch unit quickly transfers the pre-stored voltage from the share line, avoiding the need for slow direct charging from the source driving circuit during the refresh cycle.
3Power
If a power supply circuit provides voltage to each data line individually, then each data line can be controlled precisely, but the overall power consumption increases
Solution Approach 1:
Multiple data lines share a common power supply channel through the share line. Instead of each data line having its own dedicated power supply connection, they all share the same share voltage from the power supply circuit, accessed through individually controlled switch units. This merging reduces redundant power supply overhead and lowers overall power consumption.
Data Source
AI summary
A driving circuit for a display panel is disclosed, where the display panel comprises data lines. The driving circuit for the display panel includes a share line coupled to the data lines; a power supply circuit connected to the share line, and configured to provide a share voltage to the share line; and switch units coupled to the data lines, where each of the switch units has a first end coupled to the share line and a second end coupled to a corresponding one of the data lines, and the switch units are configured to, in a share phase, connect the data lines and transmit the share voltage on the share line to the data lines in response to a control signal. The display panel drive circuit can reduce the power consumption of a source drive circuit of the display panel.