Data Driver Blank Voltage Pixel Leakage
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Solution Overview
Problem
Display panels consume excessive power when showing static images, leading to decreased display quality due to pixel current leakage during blank periods.
Innovation Solution
A data driver with a power control part, digital to analog converter, buffering part, and switching parts that apply data voltage in normal mode and blank voltage in low frequency mode, adjusting frame rate and using blank voltages to minimize pixel current leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the display panel is driven at a relatively low frequency to reduce power consumption, then power consumption is reduced, but pixel current leaks through the switching elements during blank periods causing display quality to decrease
Solution Approach 1:
The patent applies preliminary anti-action by applying a blank voltage to the data line before the blank period begins, which prevents pixel current leakage during the blank period. The blank voltage is applied in advance to counteract the potential harmful effect of current leakage, thereby maintaining display quality even when operating at low frequencies for power savings
Solution Approach 2:
The patent converts the harmful pixel current leakage into a beneficial effect by using the blank voltage to control the switching elements. The blank voltage, when applied appropriately, transforms the potential harm of current leakage during blank periods into a mechanism that maintains proper pixel voltage levels and prevents display quality degradation
2Loss of energy
If switching elements are turned off during blank period to save power, then power consumption is reduced, but pixel current leaks through the turned off switching elements causing display quality to decrease
Solution Approach 1:
The patent introduces a blank voltage as an intermediary element that mediates between the need to turn off switching elements for power savings and the need to prevent pixel current leakage. The blank voltage acts as a mediator by being applied to the data line to maintain proper voltage levels even when switching elements are turned off during blank periods
Solution Approach 2:
The patent applies parameter changes by dynamically adjusting the voltage level on the data line during blank periods. Instead of maintaining a constant voltage or simply turning off signals, the system changes the voltage parameter to a specific blank voltage level that prevents current leakage while allowing switching elements to remain in their low-power state
Data Source
AI summary
A data driver including a power control part configured to control power according to mode signal determined based on an input image, a digital to analog converting part configured to convert a digital data signal into an analog data voltage, a buffering part configured to buffer the data voltage, a first switching part configured to apply the data voltage to a data line in a normal mode, when turned on, and a second switching part configured to apply a blank voltage to the data line in a blank period of a low frequency mode, when turned on.