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US 7,352,409 B2Granted
Blue stretch circuit and level detection circuit
AssigneeSanyo Electric Co., Ltd.
InventorKeijiro Ueki
Life of this patent
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Abstract
A blue stretch circuit of this invention has a first voltage detection circuit and a second voltage detection circuit, each of which detects that an amount of each of the first and the second color difference signals are within a predetermined range, a blue stretch control circuit which generates a control signal for blue stretching according to output signals of the voltage detection circuits and a level of a brightness signal and a B drive circuit to amplify a blue color signal according to an output signal of the blue stretch control circuit.
Claims1
A blue stretch circuit comprising:
- a voltage detection circuit which detects a white signal when an amount of each of a first and a second color difference signals is within a predetermined range;
- a blue stretch control circuit which generates a control signal for blue stretching according to an output signal of the voltage detection circuit and a level of a brightness signal;
- an amplifier circuit to increase a level of a blue color signal according to an output signal of the blue stretch control circuit, wherein the voltage detection circuit comprises a first voltage detection circuit which detects that an amount of the first color difference signal is within a predetermined range and a second voltage detection circuit which detects that an amount of the second color difference signal is within a predetermined range;
- and
- a logic gate which detects the white signal when the output signals of the first voltage detection circuit and the second voltage detection circuit are the same.
2 more elements
Dependencies are inferred from the claim text.