Buffer amplifying circuit possessing digital-analog conversion function
A digital-to-analog conversion, buffer amplification technology, applied in the direction of analog conversion, code conversion, electrical components, etc., can solve the problems of driving circuit area increase, circuit high power consumption, circuit area increase, etc., to reduce circuit area and cost, reduce The effect of the resistor
Active Publication Date: 2013-09-25
SITRONIX TECH CORP
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Problems solved by technology
[0004] From the above, it can be known that the driving circuit of the conventional liquid crystal display generates multiple levels of voltage potentials through multiple resistors R. Therefore, too many resistors will cause excessive power consumption of the circuit, and if in order to reduce power consumption When increasing the resistance value of the resistor, since the formula of the resistance value is R=ρL / A, you can use a material with a higher resistance value or increase the length to increase the resistance. If the length of the resistance is increased, the area of the circuit will also increase.
Furthermore, as the resolution of the liquid crystal display becomes higher and higher, the number of gray levels required increases, which means that more resistors are required to convert the reference voltage V REF_H to the reference voltage V REF_L The voltage difference between them is divided into more potentials, so the area of the driving circuit will be greatly increased, and the production cost of the circuit will inevitably increase
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[0029] In order to make the structural features of the present invention and the achieved effects have a further understanding and recognition, preferred embodiments and detailed descriptions are specially used, which are described as follows:
[0030] Certain terms are used in the specification and subsequent claims to refer to particular components. It should be understood by those skilled in the art that hardware manufacturers may refer to the same component by different terms. This description and subsequent patent applications do not use the difference in name as a way to distinguish components, but use the difference in function of components as a criterion for distinguishing. The "comprising" mentioned throughout the specification and subsequent claims is an open term, so it should be interpreted as "including but not limited to". In addition, the term "coupled" herein includes any direct and indirect means of electrical connection. Therefore, if it is described in th...
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The present invention relates to a buffer amplifying circuit possessing a digital-analog conversion function. The buffer amplifying circuit possessing the digital-analog conversion function comprises a first digital-analog conversion unit used for generating a first current and a second current according to a first reference signal and a plurality of digital data, and distributing the weighted proportions between the first current and the second current according to the digital data; and a buffer amplifying module used for generating an output voltage according to a first input voltage, a second input voltage, the first current and the second current, and determining the size of the output voltage according to the weighted proportions between the first current and the second current. Therefore, the buffer amplifying circuit possessing the digital-analog conversion function can achieve the purposes of reducing circuit area and cost.
Description
technical field [0001] The invention relates to a buffer amplifying circuit, in particular to a buffer amplifying circuit with digital-to-analog conversion function. Background technique [0002] In the design of the driving circuit, the buffer amplifier is a common circuit unit, especially the driving circuit of the liquid crystal display. In recent years, the development of the liquid crystal display has higher and higher requirements for the resolution of the display and the richness of the displayed colors. The gray level (gray level) that the pixel voltage needs to divide also increases accordingly. However, in the driving circuit of a conventional liquid crystal display, the circuit that provides the pixel voltage to the pixel circuit usually provides the pixel voltage to the buffer amplifier through a resistor string and a decoding circuit, and a sufficient driving voltage is obtained through the buffer amplifier, and the pixel The voltage is determined by the resist...
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Inventor曾德修赵昌博
OwnerSITRONIX TECH CORP