Data Driver Output Buffer for Display Devices
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Solution Overview
Problem
Existing data drivers for flat panel displays, such as LCDs, face challenges in reducing power consumption and area while maintaining efficient image display, particularly in the context of evolving display technologies like OLEDs and PDPs, where power efficiency and compactness are critical.
Innovation Solution
The proposed solution involves a data driver architecture with an output buffer that includes a driving transistor, bias transistor, and compensating switching transistors, which optimizes the charging and discharging of data lines by minimizing unnecessary power consumption through specific operational periods and transistor configurations, thereby reducing the overall power consumption and area required.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If conventional data driver architecture is used, then image display function is maintained, but power consumption and area are excessive
Solution Approach 1:
The data driver is segmented into multiple operational periods (first period with direct connection for precharge, second period with analog amplifier connection for signal output). This temporal segmentation allows the system to use different connection modes at different times, reducing overall power consumption while maintaining display functionality.
Solution Approach 2:
The connection configuration between the digital-to-analog converter and data lines is dynamically changed between two states: direct connection during the first period and analog amplifier-mediated connection during the second period. This dynamic reconfiguration optimizes power consumption by using the most efficient connection mode for each operational phase.
2Area of stationary object
If conventional data driver architecture is used, then image display function is maintained, but area occupied is excessive
Solution Approach 1:
The output buffer integrates multiple functions (precharge, signal amplification, and data line driving) into a single unified circuit block. By merging these functions rather than implementing them as separate circuits, the overall area occupied by the data driver is reduced while maintaining all necessary operational capabilities.
Solution Approach 2:
The analog amplifier serves multiple purposes: it acts as a buffer during the first period, provides signal amplification during the second period, and maintains voltage levels across different operational phases. This multi-functionality eliminates the need for separate dedicated circuits for each function, thereby reducing the total area required.
Data Source
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AI summary
A driving device for a display device includes a gray voltage generator generating a plurality of gray voltages, a voltage selector selecting an output voltage from the plurality of gray voltages, a voltage level converter converting a level of the output voltage selected by the voltage selector and applying the output voltage with a converted level to data lines, a first switching unit connecting the voltage level converter to the voltage selector and the data lines, and a second switching unit directly connecting the voltage selector and the data lines. Operating times of the first and second switching units are different Accordingly, when a data voltage is charged in or discharged from a data line, since a separate discharging transistor or a separate discharging amplifier is not used, power consumption and an area of a data driver are reduced.