JP2597294Y2 - Video circuit with dual screen function - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a video circuit having a two-screen (PinP) function such as a television receiver.

[0002]

2. Description of the Related Art In recent years, Pins have been used in television sets.
The P function has become mainstream.

As shown in FIG. 2, a conventional video circuit with a PinP function is composed of a PinP section 11 and a signal processing section 12, and a parent / child screen is synthesized before processing a luminance signal and a chromaticity signal. The same signal processing correction has been made at times.

[0004]

In such a conventional video circuit, the same signal processing correction is performed with or without PinP.

[0005] Although PinP occupies 1/9 of the screen, it processes video signals (ABL (automatic brightness limiter), expands black (the black portion in the video is more pedestal).
Level, approaching level ) , gamma correction (intermediate in video )
Raise brightness) , white character correction (white character part in video )
The amount of the shine whiter)), since if there is a picture of the main screen only (child screen is the optimal value setting off) Pi
At the time of nPon, there is a problem that the correction amount is not an optimum value.

[0006] The present invention solves the above-mentioned problems and solves the problem of two-screen video.
It is another object of the present invention to provide a video circuit with a PinP function that can realize optimal video correction .

[0007]

According to the present invention, a signal processing section for processing a luminance signal and a chromaticity signal, a PinP section for synthesizing a parent screen and a child screen in a preceding stage thereof, and a signal processing at the time of switching PinP on / off. It has a switching circuit for switching the correction amount of the section, and changes the signal correction amount when PinP is on / off.

[0008]

According to the present invention, the signal processing correction amount is switched at the time of PinP on / off to realize the optimum signal correction with and without PinP.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIG.

[0010] A microcomputer unit 1 for outputting a PinP on / off signal, a PinP unit (two-screen unit) 2 for receiving the signal and synthesizing a sub-screen on a main screen, and a video signal output from the two-screen 2 It comprises a signal processing unit 3 for performing luminance and chromaticity processing, a switching circuit unit 4 for switching the correction amount of the signal according to PinP on / off, and an external constant 5 for determining the correction amount. By changing each correction amount in the signal processing unit 3, an optimum correction amount is applied at the time of PinPon and at the time of off.

As is clear from the above embodiments, according to the present invention, each correction amount of the video signal processing can be changed between PinPon and PinPoff, and only the conventional main screen is used.
Not only at the time of two-screen image but also at the time of
f) also provides an image with an optimal video correction amount.

[Brief description of the drawings]

FIG. 1 is a block diagram of an embodiment of the present invention.

FIG. 2 is a block diagram of a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Microcomputer part 2 PinP part 3 Signal processing part 4 Switching circuit part 5 External constant 11 PinP part 12 Signal processing part

Claims (5)

(57) [Scope of request for utility model registration] 1. A signal processing unit for processing a luminance signal and a chromaticity signal, a two-screen unit in which a parent screen and a child screen are synthesized in a preceding stage, a case of a video of a parent screen and a child screen, and only a parent screen. in the case of video, it is constituted by a switching circuit portion for switching the correction amount in the signal processing unit, at the time of dual-screen display, Mu dual-screen
Displaying an image with a different correction amount than the one displayed
A video circuit with a two-screen function. 2. A means for changing a correction amount of signal processing,
Changing the brightness current detection resistance value in the automatic brightness limiter
2. The video circuit with a two-screen function according to claim 1, wherein: 3. As means for changing the correction amount of signal processing,
It is characterized by changing the control resistance value of black extension level change amount
The video circuit with a two-screen function according to claim 1. 4. As means for changing the correction amount of signal processing,
2. The γ correction amount control resistance value is changed.
Image circuit with dual screen function as described. 5. A method of changing a correction amount of signal processing,
2. The video circuit with a two-screen function according to claim 1, wherein the white character correction amount control resistance value is changed .