Gamma Generator Merging Positive and Negative Voltages for LCD Narrow Frame Design
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Solution Overview
Problem
Current liquid crystal display (LCD) technologies require complex driving structures and increased wiring areas due to the need for multiple gamma voltage traces, leading to higher costs and limitations in narrow frame designs.
Innovation Solution
A liquid crystal display device with a gamma generator that includes two non-volatile storage units for positive and negative gamma voltage values, controlled by a polarity inversion signal, reducing the number of memory select pins and traces needed for the data driver.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If two groups of gamma voltages (positive and negative) are supplied to the data driver, then grayscale control is achieved, but the number of memory select pins and traces increases
Solution Approach 1:
The patent merges the storage of positive and negative gamma voltage values into a single gamma generator by using two storage units (first storage unit for positive gamma voltages, second storage unit for negative gamma voltages) that are selectively accessed based on the polarity inversion signal. This consolidation reduces the number of memory select pins and traces required compared to having separate gamma voltage supply paths.
Solution Approach 2:
The gamma generator periodically switches between the first storage unit and second storage unit based on the polarity inversion signal, which alternates between high and low levels. This periodic switching allows the same physical traces and pins to be reused for both positive and negative gamma voltages at different time periods, reducing the overall wiring complexity.
2Adaptability or versatility
If twenty pins are used for memory select pins to transmit all gamma voltages, then complete gamma control is achieved, but the wiring area on the liquid crystal display panel increases
Solution Approach 1:
The patent combines the transmission paths for positive and negative gamma voltages into a single set of traces by using two storage units within one gamma generator. The polarity inversion signal controls which storage unit's output is routed through the same physical traces to the data driver, effectively halving the required wiring area compared to having separate dedicated traces for each gamma voltage group.
Solution Approach 2:
The system uses periodic switching controlled by the polarity inversion signal to alternate between providing positive gamma voltages from the first storage unit and negative gamma voltages from the second storage unit through the same physical connection paths. This time-division multiplexing approach allows complete gamma voltage coverage while using fewer physical traces.
3Adaptability or versatility
If multiple traces are connected to the data driver for gamma voltages, then all gamma values are transmitted, but the cost increases
Solution Approach 1:
The patent merges the functionality of multiple gamma voltage transmission paths into a single shared path controlled by polarity inversion. By using two storage units (first storage unit and second storage unit) that output to the same trace infrastructure, the design reduces the total number of required traces and connections to the data driver, directly lowering manufacturing costs while maintaining full gamma control capability.
Data Source
AI summary
The disclosure is related to a liquid crystal display device, including a liquid crystal display panel and a gamma generator including a first storage unit storing a group of positive or negative gamma voltage values and a second storage unit storing a group of negative or positive gamma voltage values. The gamma generator periodically obtains the group of the positive or negative gamma voltage values, or the group of the positive or negative gamma voltage values according to a control of a polarity inversion signal. The liquid crystal display panel displays an image according to the group of the positive and/or the group of the negative gamma voltage values. The difference between the disclosure and the current technique is that the cost is decreased effectively; meanwhile, the driving structure is simplified, a wiring area is decreased and it is favorable for a narrow frame design.