COMMON VOLTAGE FEEDBACK COMPENSATION CIRCUIT, METHOD, AND FLAT DISPLAY DEVICE
First Claim
1. A common voltage feedback compensation circuit, comprising:
- a switch selecting circuit, wherein a feedback common voltage is inputted to a first end of the switch selecting circuit, a first reference voltage is inputted to a second end of the switch selecting circuit, and a second reference voltage is inputted to a third end of the switch selecting circuit, the switch selecting circuit is configured to determine a range of the feedback common voltage received from a display panel according to the first reference voltage and the second reference voltage, and an output end of the switch selecting circuit is configured to output corresponding switch signals according to a determining result;
a switch circuit, wherein the feedback common voltage is inputted to an input end of the switch circuit, an output end of the switch circuit connects to an input end of a compensation circuit, and the switch circuit is configured to be disconnected or closed according to the corresponding switch signals;
an attenuation circuit, wherein the feedback common voltage is inputted to an input end of the attenuation circuit, and an output end of the attenuation circuit connects to an input end of the compensation circuit;
when the switch circuit is disconnected, the feedback common voltage is inputted to and is attenuated by the attenuation circuit, and the attenuated feedback common voltage is outputted to the compensation circuit;
when the switch circuit is closed, the feedback common voltage is directly inputted to the compensation circuit;
the compensation circuit, wherein the input end of the compensation circuit connects to the output end of the switch circuit and the output end of the attenuation circuit, and an output end of the compensation circuit is configured to output common voltage compensation signals.
1 Assignment
0 Petitions
Accused Products
Abstract
The utility model relates to a voltage conditioning circuit, and particularly relates to an AD voltage conditioning circuit. The conditioning circuit comprises a voltage-dividing circuit and a voltage translation circuit. The voltage-dividing circuit and the voltage translation circuit share an output end. The voltage-dividing circuit and the voltage translation circuit are integrated together and share the output end so that the voltage-dividing circuit and the voltage translation circuit can be isolated without using an isolation circuit, AD voltage can be conditioned to an appropriate value, three arithmetic units required to be used by an original conditioning circuit is reduced to only two arithmetic units, and four resistors required to be used by the voltage-dividing circuit and the translation circuit of the original conditioning circuit are reduced to only three resistors. Therefore, the circuit is simplified, cost is greatly reduced and assembling efficiency of circuit boards is enhanced in batch production.
1 Citation
10 Claims
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1. A common voltage feedback compensation circuit, comprising:
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a switch selecting circuit, wherein a feedback common voltage is inputted to a first end of the switch selecting circuit, a first reference voltage is inputted to a second end of the switch selecting circuit, and a second reference voltage is inputted to a third end of the switch selecting circuit, the switch selecting circuit is configured to determine a range of the feedback common voltage received from a display panel according to the first reference voltage and the second reference voltage, and an output end of the switch selecting circuit is configured to output corresponding switch signals according to a determining result; a switch circuit, wherein the feedback common voltage is inputted to an input end of the switch circuit, an output end of the switch circuit connects to an input end of a compensation circuit, and the switch circuit is configured to be disconnected or closed according to the corresponding switch signals; an attenuation circuit, wherein the feedback common voltage is inputted to an input end of the attenuation circuit, and an output end of the attenuation circuit connects to an input end of the compensation circuit;
when the switch circuit is disconnected, the feedback common voltage is inputted to and is attenuated by the attenuation circuit, and the attenuated feedback common voltage is outputted to the compensation circuit;
when the switch circuit is closed, the feedback common voltage is directly inputted to the compensation circuit;the compensation circuit, wherein the input end of the compensation circuit connects to the output end of the switch circuit and the output end of the attenuation circuit, and an output end of the compensation circuit is configured to output common voltage compensation signals. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A feedback compensation method for a common voltage, comprising:
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determining a range of a feedback common voltage received from a display panel according to a first reference voltage and a second reference voltage via a switch selecting circuit; performing a common voltage compensation process with respect to the feedback common voltage directly by a compensation circuit upon determining the feedback common voltage is greater than the first reference voltage and is less than the second reference; attenuating the feedback common voltage to obtain the attenuated feedback common voltage by an attenuation circuit and performing the common voltage compensation process with respect to the attenuated feedback common voltage by the compensation circuit upon determining the feedback common voltage is less than or equal to the first reference voltage, or the feedback common voltage is greater than or equal to the second reference voltage.
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Specification