Driving system for a liquid crystal display
A driving system for a liquid crystal display includes an analog driving circuit unit, a digital analog converter and a digital interface unit. The digital analog converter supplies an analog voltage for operating the analog driving circuit unit. The digital interface unit supplies a digital signal to the digital analog converter. The analog driving circuit units, the digital analog converter and the digital interface unit may be mounted on a single chip.
1 . A driving circuit for a liquid crystal display that displays an image data, comprising:
a digital signal processor analyzing the image data and determining whether at least one image quality of an analyzed image data needs to be adjusted;
an EEPROM connected to the digital signal processor and storing a plurality of pre-programmed digital control signals, wherein the plurality of digital control signals are configured to adjust the image quality of the analyzed image data;
a digital analog converter unit receiving a digital control signal selected from the plurality of digital control signals from the EEPROM and converting the digital control signal into an analog voltage; and,
an analog driving circuit unit receiving the analog voltage from the digital analog converter and providing the analog voltage to a gamma circuit and to at least one of a common circuit and an inverter controller, wherein the gamma circuit provides a gamma voltage to the liquid crystal display and the common circuit provides a common reference voltage to the liquid crystal display and the inverter controller generates a control signal for driving an inverter.
2 . The driving circuit of claim 1 , wherein the analog driving circuit unit provides the analog voltage to a gamma circuit, a common circuit and an inverter controller.
3 . The driving circuit of claim 1 , wherein the digital signal processor generates a digital control signal to adjust the at least one image quality if the EEPROM does not store the digital control signal.
4 . The driving circuit according to claim 1 , wherein the image quality includes a brightness.
5 . The driving circuit according to claim 1 , wherein the image quality includes a contrast ratio.
6 . The driving circuit according to claim 2 , wherein the gamma circuit, the common circuit and the inverter controller are mounted on a single chip.
7 . The driving circuit according to claim 1 , wherein the digital signal processor, is the EEPROM, the digital analog converter and the digital interface unit are mounted on a single chip.
8 . The driving circuit according to claim 6 , wherein the digital signal processor, the EEPROM, the digital analog converter and the digital interface unit are mounted on a single chip.
9 . The driving circuit according to claim 1 , wherein the analog voltage is inputted to a buffer of the gamma circuit.
10 . The driving circuit according to claim 1 , wherein the analog voltage is inputted to a buffer of the common circuit.
11 . The driving circuit according to claim 1 , wherein the analog voltage is inputted to a buffer of the inverter controller.
12 . A method for driving a liquid crystal display that displays an image data, comprising:
analyzing the image data and determining whether at least one image quality of the image data needs to be adjusted by a digital signal processor;
storing a plurality of preprogrammed control signals at an EEPROM;
selecting from the EEPROM a control signal that is necessary to adjust the image quality;
transmitting the control signal to a digital analog converter via a digital interface unit;
converting the control signal to an analog voltage by the digital analog converter; and,
providing the analog voltage to a common circuit that supplies a common reference voltage to the liquid crystal display.
13 . The method of claim 12 , further comprising:
verifying whether the EEPROM stores the control signal that is necessary to adjust the image quality; and,
generating the control signal by the digital signal processor upon the verification that the EEPROM does not store the control signal.
14 . The method of claim 12 , further comprising:
providing the analog voltage to an inverter controller that generates a control signal to drive an inverter.
15 . The method of claim 12 , further comprising:
mounting the digital signal processor, the EEPROM, the digital analog converter and the common circuit on a single chip.
16 . The method of claim 14 , further comprising:
mounting the digital signal processor, the EEPROM, the digital analog converter, the common circuit and the inverter controller on a single chip.
17 . A method for driving a liquid crystal display that displays an image data, comprising:
analyzing the image data and determining whether at least one image quality of the image data needs to be adjusted by a digital signal processor;
storing a plurality of preprogrammed control signals at an EEPROM;
selecting from the EEPROM a control signal that is necessary to adjust the image quality;
transmitting the control signal to a digital analog converter via a digital interface unit;
converting the control signal to an analog voltage by the digital analog converter; and, providing the analog voltage to an inverter controller that generates a control signal to drive an inverter.
18 . The method of claim 17 , further comprising:
verifying whether the EEPROM stores the control signal that is necessary to adjust the image quality; and, generating the control signal by the digital signal processor upon the verification that the EEPROM does not store the control signal.
19 . The method of claim 17 , further comprising:
mounting the digital signal processor, the EEPROM, the digital analog converter and the inverter controller on a single chip.
20 . A method for driving a liquid crystal display that displays an image data, comprising:
analyzing the image data and determining whether at least one image quality of the image data needs to be adjusted by a digital signal processor;
storing a plurality of preprogrammed control signals at an EEPROM;
selecting from the EEPROM a control signal that is necessary to adjust the image quality;
transmitting the control signal to a digital analog converter via a digital interface unit;
converting the control signal to an analog voltage by the digital analog converter; and,
providing the analog voltage to a gamma circuit and at least one of a common circuit and an inverter controller, wherein the gamma circuit provides a gamma voltage to the liquid crystal display and the common circuit provides a common reference voltage to the liquid crystal display and the inverter controller generates a control signal for driving an inverter.
21 . The method of claim 20 , wherein the step of providing the analog voltage further comprises providing the analog voltage to the gamma circuit, the common circuit and the inverter controller.
22 . The method of claim 20 , further comprising:
verifying whether the EEPROM stores the control signal that is necessary to adjust the image quality; and,
generating the control signal by the digital signal processor upon the verification that the EEPROM does not store the control signal.
23 . The method of claim 21 , further comprising:
mounting the gamma circuit, the common circuit and the inverter controller on a single chip.
24 . The method of claim 23 , further comprising:
mounting the digital signal processor, the EEPROM, and the digital analog converter on a single chip.