KR0170632B1 - Circuit for generating interpolation signal - Google Patents

Abstract

The present invention relates to an image apparatus using a high-definition liquid crystal projector, and each shift register of the RGB source signal and the interpolation signal generators 40 to 60 by using the RGB color signal from the chroma signal processor 20. 42) to 45 and the adder ADD1 and the divider 46 to generate an interpolated signal with respect to the original signal, and according to the switching operation of the switch SW1 under the control of the controller 30, the chroma signal processor 20 By outputting the original RGB color signal and the interpolation signal from the panel alternately, a high quality image is realized.

Description

Interpolation Signal Generation Circuit

1 is a block diagram of an interpolation signal generation circuit according to the present invention.

2 is a detailed circuit diagram of FIG.

3 is a state diagram of a liquid crystal panel having a delta structure according to FIG. 2.

* Explanation of symbols for main parts of the drawings

10: Y / C separation unit 20: chroma signal processing unit

30: controller

40 ~ 60: R.G.B original signal and interpolation signal generator

41: line memory 42 to 45: shift register

46: divider LIF1, LPF2: low pass filter

ADC1: Analog Digital Converter DAC1: Digital Analog Converter

SW1: Switch

The present invention relates to an imaging apparatus using a high-definition liquid crystal projector, and more particularly, to generate an interpolation signal by using an original signal and supply the interpolation signal to a panel to obtain a high quality image. It relates to a signal generating circuit.

In general, as liquid crystal projectors move to high quality, the scanning method currently used due to the increase in the number of pixels of the panel cannot properly drive the panel, and thus a high quality image cannot be obtained.

The present invention has been made to solve this problem, and an object of the present invention is to generate a signal combining a sampling point of one radix line and the next radix line, and to supply a high quality image by supplying an interpolation signal between each radix line. An interpolation signal generating circuit is provided.

A characteristic of this invention for achieving this object is a Y / C separation unit for separating a composite video signal into luminance and chroma signals, and a chroma signal for outputting RGB color signals as luminance signals and chroma signals from the Y / C separation unit. A video signal processing system comprising a processing unit and a controller for generating various control signals using the luminance signal from the Y / C separation unit, the video signal processing system being connected to the chroma signal processing unit and the controller according to the control of the controller. An interpolation signal generation circuit including an RGB original signal and an interpolation signal generator for generating an RGB color signal and an RGB interpolation signal using the RGB color signal from the chroma signal processor.

Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

1 is a block diagram of an interpolation signal generating circuit according to the present invention, wherein a chroma signal processor 20 is provided in a Y / C separation unit 10 that separates a complex video signal into a luminance (Y) signal and a chroma (C) signal. ) And the controller 30. The chroma signal processing unit 20 generates an RGB color signal using the luminance signal from the Y / C separation unit 10 and the chroma signal, and the controller 30 uses the luminance signal from the Y / C separation unit 10. To make various control signals.

The RGB signal processor 20 and the controller 30 are connected to the RGB source signal and the interpolation signal generators 40 to 60, and are controlled from the chroma signal processor 20 under the control of the controller 30. An original signal, which is an RGB color signal, and an RGB interpolation signal using the RGB color signal are output.

FIG. 2 is a detailed circuit diagram of the RGB original signal and interpolation signal generators 40 to 60 of FIG. 1, and each of the RGB original signal and interpolation signal generators 40 to 60 has the same configuration. Here, the RGB original signal and the interpolation signal generators 40 to 60 will be described as one.

First, the analog digital converter ADC1 is connected to a low pass filter LPF1 for low pass filtering the RGB color signal from the chroma signal processor 20 to remove noise components, thereby receiving a signal from the low pass filter LPF1. Convert to a digital signal.

A line memory 41 is connected to the analog digital converter ADC1 to delay a signal from the analog digital converter ADC1.

In addition, shift registers 42 to 45 are connected to the analog digital converter ADC1 and the line memory 41 to shift the signals from the analog digital converter ADC1 and the line memory 41, respectively. An adder ADD1 is connected to the shift registers 42 to 45 to add each signal from the shift registers 42 to 45, and a divider 46 is added to the adder ADD1. By connecting, the signal from the adder ADD1 is divided by a negative number to make an interpolation signal of the even line inverted.

On the other hand, the line memory 41 and the divider 46 are switched under the control of the controller 30 to be an original signal which is an RGB color signal from the line memory 41 and the interpolation signal from the divider 46. Connect the switch (SW1) to output the.

A digital analog converter DAC1 is connected to the switch SW1 to convert a signal from the switch SW1 into an analog signal, and a low pass filter LPF2 is connected to the digital analog converter DAC1 to the digital analog converter. The signal from the converter DAC1 is low pass filtered to remove noise components. The composite video signal input in the present invention configured as described above becomes an R.G.B color signal through the Y / C separation unit 10 and the chroma signal processing unit 20.

The RGB color signal becomes a digital signal from which noise is removed through the low pass filter LPF1 and the analog digital converter ADC1, and then a part of the RGB color signal is input to the line memory 41 and a part of the shift registers 44, 45. Are entered directly.

The signal input to the line memory 41 is delayed by one horizontal scanning period and input to the shift registers 42 and 43. If the signals of the shift registers 42 to 45 are A, B, C, and D, the state on the scan line is as shown in FIG. 3 and becomes A when the A shift is performed.

The signals from the shift registers 42 to 45, that is, A, B, C, and D, are input to the adder ADD1 and added.

The signal added by the adder ADD1 passes through the divider 46 and is output as an inverted signal suitable for applying an in-line inverted signal, which is one of liquid crystal driving methods for preventing flicker, and applied to the even line of FIG. 3.

In this case, since the divider 46 adds the signals from the shift registers 42 to 45 in the adder ADD1, the divider 46 divides the number of the shift registers 42 to 45 into 4 to average them. It is divided by the negative number to make an inverted signal. That is, divided by -4 here.

The switching operation of the switch SW1, which is output as an interpolation signal through the divider 46 and a signal through the memory 41, is switched at a speed of twice the horizontal scanning period according to the proposal of the controller 30. Are alternately selected and then converted into an analog signal through the digital analog converter DAC1 and then low pass filtered through the low pass filter LPF2 to remove noise components and apply them to the panel. A positive original signal is applied and an inverted negative interpolation signal is applied to the even line to drive the panel, thereby realizing a high quality clear image.

As described above, according to the present invention, in an LCD projector having an increased number of pixels in a panel, an interpolation signal is generated by an RGB original signal and an interpolation signal generator by using the original signal, and the original signal and the interpolation signal according to the switching operation under the control of the controller. By alternately supplying the to the panel, it is possible to appropriately cope with the increase in the number of pixels of the panel, thereby obtaining a high quality image.

Claims (2)

A Y / C separation unit 10 for separating the composite video signal into luminance and chroma signals, a chroma signal processing unit 20 for outputting RGB color signals as luminance signals and chroma signals from the Y / C separation unit 10; In the video signal processing system comprising a controller 30 for generating various control signals using the luminance signal from the Y / C separation unit 10, the chroma signal processing unit 20 and the controller 30 RGB source signal and interpolation signal generator 40 to generate RGB color signals from the chroma signal processor 20 and respective RGB interpolation signals using the RGB color signals under the control of the controller 30. An interpolation signal generation circuit further comprising (60). The low pass filter LPF1 of claim 1, wherein the RGB source signal and the interpolation signal generators 40 to 60 remove low noise by low pass filtering the RGB color signals from the chroma signal processor 20. And an analog digital converter (ADC1) connected to the low pass filter (LPF1) to convert a signal from the low pass filter (LPF1) into a digital signal, and connected to the analog digital converter (ADC1). A line memory 41 for delaying a signal from the ADC1 and a line memory 41 and an analog digital converter ADC1 are connected to shift the signals from the line memory 41 and the analog digital converter ADC1. Shift registers 42 to 45, an adder ADD1 connected to the shift registers 42 to 45 to add a signal from the shift registers 42 to 45, and the adder ( AD A divider 46 connected to D1) and generating a signal from the adder ADD1 as an interpolated signal of an inverted even line, and connected to the line memory 41 and the divider 46 to the controller 30. A switch SW1 which is switched under the control of the control unit and outputs an RGB color signal from the line memory 41 and an interpolation signal from the divider 46, and is connected to the switch SW1 and is connected to the switch SW1. A low-pass filter that removes noise by low-pass filtering the signal from the digital-to-analog converter DAC1 and a digital-to-analog converter DAC1 that converts a digital signal from the digital signal into an analog signal. An interpolation signal generation circuit composed of (LPF2).