Flat Panel Display Data Driver Gamma Selecting Signal
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional methods for increasing the view angle of liquid crystal displays complicate circuit design and increase costs by requiring the frequency of clock signals in timing controllers and data drivers to be doubled.
Innovation Solution
A data driver utilizing gamma selecting and polarity inversion signals to generate multiple sets of gray voltages, allowing sub-pixels to receive different pixel voltages without increasing clock signal frequencies, thereby enhancing view angle without complicating circuit design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If two data items corresponding to the same pixel are sequentially transmitted to increase view angle, then the view angle is improved, but the clock signal frequency must be doubled making circuit design more complicated
Solution Approach 1:
The patent segments the gray voltage generation into four independent units (first positive gray voltage generating unit, first negative gray voltage generating unit, second positive gray voltage generating unit, second negative gray voltage generating unit), each handling specific voltage ranges. This segmentation allows simultaneous generation of multiple voltage levels without increasing clock frequency, resolving the contradiction between view angle improvement and circuit complexity
Solution Approach 2:
The patent introduces dynamic switching mechanisms through the gamma selecting signal and polarity inversion signal that dynamically connect different gray voltage generating units to different digital-to-analog converters based on required voltage levels. This dynamic reconfiguration enables flexible voltage selection without hardware expansion, improving adaptability while maintaining circuit simplicity
2Adaptability or versatility
If two data items corresponding to the same pixel are sequentially transmitted to increase view angle, then the view angle is improved, but the manufacturing cost increases
Solution Approach 1:
Each gray voltage generating unit serves multiple functions: the first positive gray voltage generating unit provides voltages for both first and second digital-to-analog converters depending on the gamma selecting signal state. This multi-functionality reduces the total number of voltage generation circuits needed, lowering manufacturing cost while maintaining the capability to drive pixels for enhanced view angle
Solution Approach 2:
The patent merges the functions of multiple gray voltage generating units into a coordinated system where four units work together to replace what would traditionally require separate voltage generation paths for different data items. By combining these units with shared digital-to-analog converters and buffers controlled by selection signals, the design reduces component count and manufacturing complexity
3Ease of manufacture
If multiple sets of gray voltages are generated using gamma selecting and polarity inversion signals, then the circuit design remains simple and manufacturing cost is reduced, but the system must efficiently manage voltage selection and switching
Solution Approach 1:
The patent introduces gamma selecting signals and polarity inversion signals as intermediary control elements that mediate between the digital control logic and the analog voltage generation. These intermediary signals simplify the control interface by providing clear, discrete selection states that directly control switch connections, making the system easier to manage despite the multiple voltage levels involved
Data Source
AI summary
A data driver using a gamma selecting signal, a flat panel display with the same and a driving method therefor are provided. A first to a fourth data lines are electrically connected to a first left sub-pixel, a first right sub-pixel, a second right sub-pixel and a second left sub-pixel, respectively. The data driver includes a first, a second, a third and a fourth gray level generating units for outputting a first set of positive gray voltage, a second set of negative gray voltage, a second set of positive gray voltage and a first set of negative gray voltage, respectively. The data driver drivers these sub-pixels according to the first set of positive gray voltage, the second set of negative gray voltage, the second set of positive gray voltage and the first set of negative gray voltage under the control of a polarity inversion signal and a gamma selecting signal.