Gamma Voltage Generating Circuit for LCD Gamma Curve Adjustment
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Solution Overview
Problem
Existing gamma voltage generating circuits in liquid crystal display devices require additional buffers to adjust the gamma curve, leading to increased component costs and IC size when adding gamma points.
Innovation Solution
A gamma voltage generating circuit that utilizes a first and second gamma voltage generating unit to receive reference voltages, generate gamma reference voltages, and divide them to produce a plurality of positive and negative gamma voltages, allowing for the addition of gamma points without requiring additional output buffers, thereby maintaining the IC size and cost.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If additional buffers are added to adjust the gamma curve, then the gamma point precision is improved, but the IC size and component cost increase
Solution Approach 1:
The existing buffers in the gamma voltage generating circuit are made to serve dual functions: their primary function of voltage buffering and an additional function of generating gamma reference voltages by inputting reference voltages. This eliminates the need for separate buffers dedicated to gamma point adjustment, thereby improving gamma point precision without increasing IC size or component count.
2Measurement precision
If additional buffers are added to adjust the gamma curve, then the gamma point precision is improved, but the component cost increases
Solution Approach 1:
The existing buffers are utilized for multiple purposes including gamma reference voltage generation, eliminating the need for additional dedicated buffers for gamma point adjustment. This reduces component count and associated costs while achieving improved gamma point precision through the same buffer components.
3Adaptability or versatility
If the number of gamma points is increased, then the gamma curve adjustment capability is improved, but the decoder unit complexity increases
Solution Approach 1:
The existing buffers serve as intermediaries that generate gamma reference voltages when reference voltages are input to them. This intermediary function enables increased gamma points and improved gamma curve adjustment capability without requiring additional decoders or increasing decoder unit complexity, as the buffers handle the additional voltage generation requirements.
Data Source
AI summary
The present disclosure relates to a liquid crystal display device, and particularly, to a gamma voltage generating circuit capable of increasing a gamma point without an addition buffer and without increasing a chip size, and a liquid crystal display (LCD) device including the same. By adding a gamma point by utilizing an output buffer for inputting a reference voltage, a gamma curve may be minutely adjusted without increasing cost and a size.