Electro-luminescence Display Panel Data Driver Pre-charging
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Solution Overview
Problem
Conventional electro-luminescence display panels face challenges in increasing light-emitting time and reducing power consumption due to long rising times and large swing widths of data signals, which deteriorate light-emission efficiency and increase power consumption.
Innovation Solution
The electro-luminescence display panel employs a data driver that pre-charges data lines with a middle voltage during disable intervals and supplies data signals during enable intervals, using a multiplexer to selectively apply pre-charging voltage and data signals, thereby reducing rising times and swing widths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If data signals are supplied from ground voltage (0V) to the data line, then the data signal can be properly transmitted, but the rising time becomes long and the swing width becomes large, which increases power consumption and reduces light-emitting time
Solution Approach 1:
The patent applies preliminary action by pre-charging the data line to a middle voltage level before the actual data signal is supplied. This preliminary pre-charging action reduces the voltage swing required during the subsequent data signal transmission, thereby decreasing both the rising time and power consumption while extending the light-emitting time of the EL cell.
2Productivity
If data signals with large swing widths are applied to the data line, then the data can be transmitted, but the rising time increases and light-emission efficiency deteriorates
Solution Approach 1:
The patent pre-charges the data line to a middle voltage level before supplying the data signal. This preliminary action reduces the voltage swing width required for data transmission, which directly decreases the rising time and improves light-emission efficiency by allowing the EL cell to remain in the light-emitting state for a longer duration.
3Device complexity
If the data driver supplies data signals directly without pre-charging, then the circuit remains simple, but the rising time is long and power consumption is high
Solution Approach 1:
The patent introduces a pre-charging function in the data driver that operates during the disable interval of the scan signal. This preliminary pre-charging action prepares the data line by raising its voltage to a middle level, which subsequently reduces the power consumption and rising time during the actual data signal transmission without significantly increasing circuit complexity.
4Ease of operation
If the scan signal has a disable interval, then sequential scanning can be implemented, but the data line must be re-charged from ground voltage during this interval, increasing power consumption
Solution Approach 1:
The patent utilizes the disable interval of the scan signal to perform preliminary pre-charging of the data line to a middle voltage level. This preliminary action during the disable interval prepares the data line for the subsequent enable interval, reducing the power consumption that would otherwise be required to charge the data line from ground voltage during active scanning.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach extends the light-emitting period of EL cells, enhances light-emission efficiency, and reduces power consumption by minimizing rising times and swing widths of data signals.
Implementation Method 1
The EL display panel is a self-luminous device capable of light-emitting a phosphorous material by a re-combination of electrons with holes
Data Source
AI summary
An electro-luminescence display panel and a driving method thereof for increasing a light-emitting time of a pixel as well as reducing power consumption are disclosed. In the electro-luminescence display panel, a pixel matrix has a plurality of electro-luminescence cells connected between scan lines and data lines. A scan driver drives the scan line. A data driver pre-charges the data lines into a middle voltage of data signals and then supplies corresponding data signals.