Signal-adjusted LCD control unit
View Patent ↗An LCD control unit includes a software adjustment block for adjusting the γ-correction voltages by a software. The LCD control unit includes a voltage generator block generating n γ-correction voltages and m Vcom voltages based on a voltage address signal, a voltage selecting block selecting a pair of γ-correction voltages and a Vcom voltage based on a time series polarity control signal, and an LCD driver having a γ-correction resistor string which receives the γ-correction voltages at both the ends thereof. The LCD driver converts external data signals into display voltages having voltages corrected by the outputs from the γ-correction resistor string.
1. An LCD control unit for driving an LCD panel in an LCD device, said LCD control unit, comprising:
a signal controller for generating a voltage address signal and a polarity control signal;
a voltage generator block, directly coupled to said signal controller, for internally generating a plurality of (n) γ-voltage levels and a plurality of (m) Vcom-voltage levels, said voltage generator block including a voltage selecting block, wherein output of said voltage generating block is selected by said voltage selecting block from said plurality of (n) γ-voltage levels and said plurality of (in) Vcom-voltage levels according to a value of said voltage address signal input to said voltage generator block;
an impedance converter block, coupled to said signal controller and coupled to and separate from said voltage generator block, that converts input impedances of the γ-voltage levels and the Vcom-voltage levels provided by said voltage generator block and provides as output a specified number of said γ-correction voltages and said Vcom voltage according to a value of said polarity control signal; and
an LCD driver for generating a set of display data signals based on a set of external data signals, wherein said LCD driver receives said specified number of said γ-correction voltages output from said impedance converter and includes a γ-correction section for correcting voltages of said display data signals based on said specified number of said γ-correction voltages.
2. The LCD control unit as defined in claim 1 , wherein said voltage address signal and said polarity control signal are generated based on a software as time series signals.
3. The LCD control unit as defined in claim 1 , wherein said voltage generator block includes a resistor string for generating n =L voltage levels, n first decoders for selecting said n γ-voltage levels from said n =L voltage levels based on said voltage address signal, and m second decoders for selecting said m Vcom-voltage levels from said n =L voltage levels based on said voltage address signal, given number L being an integer.
4. The LCD control unit as defined in claim 1 , wherein said specified number of γ-correction voltages are a pair of γ-correction voltage.
5. The LCD control unit as defined in claim 4 , wherein said voltage selecting block alternately selects said pair of γ-correction voltages having a positive polarity and said pair of γ-correction voltages having a negative polarity, with respect to said Vcom voltages.
6. The LCD control unit as defined in claim 1 , wherein said voltage generator block includes a resistor string for generating a plurality of voltage levels, a decoder for decoding said voltage address signal, and a selector for selecting one of said γ-voltage levels or one of said Vcom voltage levels.
7. The LCD control unit as defined in claim 1 , wherein said LCD control unit is a one-chip IC.
8. A display control unit for driving a display panel in a display device, said display control unit comprising:
a signal controller for generating a voltage address signal and a polarity control signal;
a voltage generator block, directly coupled to said signal controller, for internally generating a plurality of (n) γ-voltage levels and a plurality of (m) Vcom-voltage levels, said voltage generator block including a voltage selecting block, wherein output of said voltage generating block is selected by said voltage selecting block from said plurality of(n) γ-voltage levels and said plurality of (m) Vcom-voltage levels according to a value of said voltage address signal input to said voltage generator block;
an impedance converter block, coupled to said signal controller and coupled to and separate from said voltage generator block, that converts input impedances of the γ-voltage levels and the Vcom-voltage levels provided by said voltage generator block and provides as output a specified number of said γ-correction voltages and said Vcom voltage according to a value of said polarity control signal; and;
a display driver for generating a set of display data signals based on a set of external data signals, wherein said display driver receives said specified number of said γ-correction voltages output from said impedance converter and includes a γ-correction section for correcting voltages of said display data signals based on said specified number of said γ-correction voltages.
9. The display control unit as defined in claim 8 , wherein said γ-correction section generates a plurality of voltages based on said specified number of said γ-correction voltages, and said voltages of display data signals are selected from said plurality of voltages generated by said γ-correction section based on said set of external data signals.