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.
Claims8
A blue stretch circuit comprising:
- a voltage detection circuit which detects that amount of each of a first and a second color difference signals is within a predetermined range;
- and
- an amplifier circuit to increase a level of a blue color signal according to an output signal of the voltage detection circuit.
A blue stretch circuit comprising:
- a voltage detection means for detecting that amount of each of a first and a second color difference signals is within a predetermined range;
- and
- an amplifying means for increasing a level of a blue color signal according to an output signal of the voltage detection means.
A level detection circuit which detects that a level of an input signal is within a predetermined range of a reference level of a reference voltage supply using the single reference voltage supply, comprising:
- a first comparison portion which generates a discrimination output signal when the level of the input signal is lower than the reference level of the reference voltage supply;
- and
- a second comparison portion which generates a discrimination output signal when the level of the input signal is higher than the reference level of the reference voltage supply.
Dependencies are inferred from the claim text.