Display Device Gamma Reference Voltage Circuit
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Solution Overview
Problem
Current LCD devices require multiple gamma reference voltages to achieve desired gamma curves, leading to increased product costs and fixed gamma curves, limiting flexibility in achieving various gamma curves according to user or manufacturer needs.
Innovation Solution
A data voltage generating circuit that includes a gamma reference voltage generator and a gray level voltage generator, using a plurality of gray level voltage dividers to generate 2k gray level voltages from first and second gamma reference voltages, allowing selection of the appropriate gray level voltage corresponding to the data signal, enabling flexible gamma curve adjustment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If multiple gamma reference voltages are used to achieve desired gamma curves, then gamma curve accuracy is improved, but device complexity and product cost increase
Solution Approach 1:
The patent changes the parameter of gamma reference voltages from multiple fixed voltages to two variable voltages (first and second gamma reference voltages) that can be dynamically adjusted. By varying these two reference voltages, the system can achieve multiple different gamma curves without requiring multiple fixed reference voltage lines, thus reducing device complexity while maintaining gamma curve accuracy.
Solution Approach 2:
The patent introduces dynamic adjustment capability to the gamma reference voltage system. Instead of using multiple static gamma reference voltages, the system uses two gamma reference voltages that can be dynamically changed to achieve different gamma curves. This dynamic approach reduces the number of required voltage lines and circuit elements while maintaining the ability to achieve desired gamma curves.
2Adaptability or versatility
If multiple gamma reference voltages are supplied through transfer lines, then gamma curve control is improved, but the number of transfer lines and circuit elements increases
Solution Approach 1:
The two gamma reference voltage lines serve multiple functions: they can be dynamically adjusted to achieve different gamma curves, replacing the need for multiple dedicated reference voltage lines. Each voltage line is multi-functional, capable of providing different voltage levels depending on the desired gamma curve, thus reducing the total number of transfer lines required.
Solution Approach 2:
By changing the voltage parameters of the two gamma reference voltages, the system can achieve multiple gamma curves. This parameter variation approach allows the same physical transfer lines to carry different voltage signals for different gamma curve requirements, reducing the need for separate dedicated lines for each gamma curve type.
3Ease of manufacture
If fixed gamma curves are used with standard circuit configurations, then manufacturing is simplified, but adaptability to user needs is reduced
Solution Approach 1:
The patent makes the gamma curve configuration dynamic by enabling variable adjustment of the two gamma reference voltages. This allows the same circuit configuration to adapt to different gamma curve requirements based on user or manufacturer needs, providing versatility without requiring multiple fixed circuit designs. The system can be manufactured with a standard configuration but adjusted dynamically for different applications.
Solution Approach 2:
The system maintains manufacturing simplicity by using a standard circuit configuration with two adjustable voltage parameters. By changing these parameters (the two gamma reference voltages), different gamma curves can be achieved without modifying the physical circuit layout. This parameter-based adaptability maintains ease of manufacture while providing flexibility for different gamma curve requirements.
Data Source
AI summary
A display device includes a data voltage generating circuit supplied with a data signal and generating a data voltage. The data voltage generating circuit includes a gamma reference voltage generator generating first and second gamma reference voltages and a gray level voltage generator including a plurality of gray level voltage dividers generating a plurality of 2k gray level voltages. The gray level voltage dividers use the first and second gamma reference voltages, wherein one of the plurality of gray level voltage dividers is selected and supplied with the first and second gamma reference voltage. The data voltage is one of the selected 2k gray level voltages corresponding a gray level of a data signal. A display panel displays images using the data voltage.