Display Panel Pre-Charge Switching for Faster Data Slew
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing display devices face challenges in improving data slew for enhanced image quality while maintaining low power consumption, as methods to extend data voltage output or increase horizontal driving time are unfavorable for power efficiency.
Innovation Solution
A display device and driving method utilizing a multiplexer switch circuit with data and auxiliary output channels to alternately connect data lines during different time periods, along with a source driver that outputs pre-charge voltages, to enhance data slew and reduce power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the output-enable range of data voltage is extended or the length of horizontal time for driving one pixel row is increased, then data slew is improved, but power consumption increases
Solution Approach 1:
The source driver is divided into multiple output channels (first data output channel, second data output channel, first auxiliary output channel, second auxiliary output channel) that operate in parallel. Each channel serves specific data lines during specific time periods, allowing simultaneous data voltage output to multiple lines without extending the horizontal time or increasing power consumption.
Solution Approach 2:
The multiplexer switch circuit dynamically switches the connection between output channels and data lines based on timing signals. During the first time period, the first data output channel connects to odd-numbered data lines while the first auxiliary output channel connects to even-numbered data lines. During the second time period, these connections are swapped. This dynamic switching enables efficient data voltage delivery without increasing power consumption.
2Manufacturing precision
If conventional methods are used to improve data slew, then image quality is enhanced, but power consumption increases
Solution Approach 1:
The auxiliary output channels output pre-charge voltages to even-numbered data lines during the first time period before the main data voltage is applied. This preliminary action prepares the data lines by establishing appropriate voltage levels, enabling faster and more accurate data voltage transitions without increasing power consumption during the main data driving period.
Solution Approach 2:
The system changes the voltage parameters of data lines dynamically. The pre-charge voltage (first pre-charge voltage or second pre-charge voltage) is different from the final data voltage (first data voltage or second data voltage). By transitioning through intermediate pre-charge states, the system achieves smoother voltage transitions and improved image quality without the power consumption penalty of direct high-speed switching.
Data Source
AI summary
A display device includes a source driver outputting a first data voltage via a data output channel and a first pre-charge voltage via an auxiliary output channel in a first time period during a refresh frame and outputting a second data voltage via the data output channel and a second pre-charge voltage via the auxiliary output channel in a second time period following the first time period during the refresh frame; and a display panel including a first pixel in an odd pixel row and connected to a first data line to receive the first data voltage in the first time period and the second pre-charge voltage in the second time period, and an adjacent second pixel in an even pixel row and connected to a second data line to receive the first pre-charge voltage in the first time period and the second data voltage in the second time period.