KR940010358B1 - Color video printing device using lcd - Google Patents

Abstract

The color video printer apparatus improves a resolution as much as m-times in respective red, green, blue in a color filter structure of LCD panel. The apparatus includes a decoder for dividing R.G.B signals, an analog-to-digital converter, a data storing unit, a D/A converter for converting the data into the alalog signal, an LCD driving unit, and an LCD panel having a cut-off film for cutting off the application of signal voltage.

Description

Color video printer using LCD

1 is a block diagram of a color video printer system using the LCD of the present invention.

2 is a cross-sectional view of the LCD panel configuration according to the present invention.

3 is a structural diagram of a color filter for doubling the resolution according to the present invention.

4 is a structural diagram of a color filter for doubling the resolution according to the present invention.

5 is a waveform diagram in which data is converted by the A / D converter of the present invention.

6 is a structural diagram of a color filter according to another embodiment of the present invention.

7 is a cross-sectional view of a conventional LCD panel configuration.

8 is a conventional color filter structure diagram.

9 is a waveform diagram of converting data by a conventional A / D converter.

10 is a structural diagram of a color filter for increasing the resolution by m times according to the present invention.

* Explanation of symbols for main parts of the drawings

1: Decoder 2: A / D Converter

3: data storage unit 4: D / A converter

5: LCD driver 6: LCD panel

7: exposure paper 16: color filter layer

The present invention relates to a color video printer using an LCD (Liquid Crystal Display), and in particular, to improve the resolution of the color filter structure of the LCD panel by red, green, and blue by m times. A color video printer device using an LCD.

The system configuration of a color video printer using a conventional fiber optic liquid crystal display (FOLCD) decodes input signals from red (R), green (G), and blue (B) from VCR and TV. A decoder that decorates, an A / D converter that converts the decoded signal to analog-to-digital (A / D), a data storage that stores the A / D converted signal, and stores the stored data in an analog signal. A digital / analog (D / A) converter for converting, an LCD driver for driving the LCD by receiving a signal converted into an analog signal, and an LCD panel for exposing the exposure paper by the signal of the LCD driver.

7 is a cross-sectional view of a conventional LCD panel configuration, and as shown therein, a signal switching unit including a scanning line 12a, a signal line 13a, a thin film transistor 10a, and a pixel electrode 11a; And a liquid crystal part 14a, a common electrode 15a, a color filter layer 16a, a glass substrate 9a, and a polarizing plate 8a.

The conventional color filter of the LCD panel is composed of an R filter, a G filter, and a B filter as shown in FIG.

Referring to the operation of the conventional color video printer system using the LCD as described above are as follows.

Receives video signals from VRC or TV and decodes them in a decoder to separate R, G and B signals, and converts the separated R, G and B signals into digital signals in an A / D converter and stores them in the data storage. In this case, as shown in FIG. 9, the digital signals A, R, G, and B signals are all sampled by the horizontal resolution of the liquid crystal (n liquid crystal lines have n pixels) every one horizontal period. D will be converted and stored.

When the signal stored in the data storage unit is D / A-converted by an amount corresponding to one horizontal period for each of R, G, and B and inputted to the LCD driver, the LCD driver outputs the driving signal to the LCD panel and exposes it on the photosensitive paper. In this case, the photosensitive paper or the exposure paper is moved in a predetermined direction by one line (d).

That is, when the R, G, B analog signals are input from the LCD driver, the LCD panel receives n signals for each horizontal period for each of the R, G, and B liquid crystal pixels, and performs exposure for a certain period of time. Is moved, and after the movement, it receives the signal of the next horizontal line and exposes it.

The conventional LCD as described above has a pixel pitch limit of approximately 200 μm in width and length, respectively, which is about 127 [dPI] in units of dPI, compared with the resolution of an image printed by an ink jet method. As a result, the resolution of color video printer systems using LCDs is reduced. That is, there is a problem that the photosensitive characteristics with high resolution are not sufficiently utilized.

Accordingly, the present invention was devised to improve the resolution by m by dividing the color filter structure in the color video printer system using the LCD, which will be described in detail with reference to the accompanying drawings.

FIG. 1 is a block diagram of a system of a color video printer using an LCD of the present invention, as shown in FIG. 1, and a decoder 1 for decoding input signals from TVs or TVs into R, G, and B. A / D converter (2) for making 2n digital signals each time R, G, and B signals, which is 2 times higher than conventional n signals for each horizontal period, and a data storage unit for storing A / D converted data. (3), the D / A converter 4 for converting the stored data into an analog signal, the LCD driver 5 for driving the LCD by receiving the signal converted into the analog signal, and the LCD driver 5 for exposure. It consists of an LCD panel 6 having a color filter for exposing the paper 7 and a blocking film.

FIG. 2 is a cross-sectional view of the LCD panel 6 of FIG. 1 according to the present invention. As shown therein, the scan line 12, the signal line 13, the thin film transistor 10, and the pixel electrode 11 are shown in FIG. It consists of a signal switching unit, a liquid crystal unit 14, a color filter unit 16 having a blocking film 18, a glass substrate 9, and the like, and the structure of one color filter includes two R filters as shown in FIG. (R ₀ , R _E ), two G filters (G ′, G _E ), and two B filters (B _0, B _E ), and the blocking film 18 attached to the upper or lower portion of the color filter is a fourth As shown in the figure has a black coated portion and the coated portion serves to block light.

The operation and effects of the color video printer using the LCD panel according to the present invention will be described in detail as follows.

Receives a video signal from VRC or TV and decodes R, G and B in decoder 1, and A / D converter 2 receives R, G and B signals of decoder 1 and doubles the resolution. In order to improve, the digital signal is stored in the data storage unit 3 by two digital signals, each of which is twice as large as the conventional n digital signals per R, B, and G for each horizontal period. Creating a digital signal by sampled is shown in FIG.

The signal data stored in the data storage unit 3 is converted into an analog signal by the D / A converter 4 and then supplied to the LCD panel 6 by the LCD driver 5 so that the signal irradiated by the LCD panel is exposed. The paper 7 is exposed on the paper 7 to perform a printer function. A process in which the R, G, and B signals are supplied to the LCD panel and the exposure process according to the signal will be described as an example.

In FIG. 5, odd-numbered data (D ₁ , D ₃ , D ₅ ,..., D _2n-1 ) of the data for the R signal voltage are processed in the color filter in the LCD panel as shown in FIG. Is supplied to one of the two filters R _{O and} R _E of the filter R _O , and in this state, half of the filter R _O passes through the blocking film (hatched portion) of FIG. 4. You won't be.

After the exposure of the filter R _O , the exposure paper is moved by the width d of one filter in the vertical direction, and the portion exposed by the filter R _O is placed at the position of the filter R _E. .

The even-numbered data (D ₂ , D ₄ , D ₆ ,..., D _2n-1 ) as shown in FIG. 5 among the data for the next R signal voltage is processed through the signal processing and another color filter of the LCD panel. It is supplied to the filter R _E , and in this state, the R light passing through the filter R _E is exposed to the exposure paper. At this time, during exposure through the filter R _E , the filter R _O receives a signal voltage corresponding to the next horizontal synchronous and repeats the above process.

The exposure method using the filters R _{O and} R _E of the R signal as described above proceeds in the same way with the filters G _{O and} G _E and the filters B _{O and} B _E , thereby to the entire R, G and B signals. Exposure to light.

As can be seen above, one pixel size according to the invention (the non-hatched portion in FIG. 4) is equal to the conventional one pixel size (the sum of the hatched portions and non-hatched portions in FIG. 4). Compared to the conventional method, since the exposure paper is exposed to the unblocked portion of the R _O filter line first, the exposure paper is moved by d, and the remaining portion is exposed by the unblocked portion of the R _E filter. It can be doubled.

Therefore, in order to improve the resolution twice by the present invention, an A / D converter having twice the speed of the conventional components and a memory unit having twice the storage capacity are required.

If the above principle is extended, the color filter R ₁ -R _m (G ₁ , G _m ) (B ₁ -B _m ) composed of m lines for each of R, B, and G, as in the tenth diagram, Pixel pitch (P _m ) By using a blocking film (hatched), it is possible to configure an LCD panel in which the resolution is improved by m times in the horizontal direction.

In this case, since data is required by m times, the speed of A / D conversion must be increased by m times and the capacity of the data storage unit must be increased by m times.

As another embodiment of the present invention, the same effect can be obtained for improving the resolution in the vertical direction. When the resolution in the vertical direction is to be improved by 2 times, the structure of the blocking film is increased by 1 / top of each line filter as shown in FIG. Dividing by two and blocking one by one up and down alternately brings about twice the resolution in the vertical direction. At this time, twice as much data is required in the vertical direction.

As described above, the color filter in the LCD panel is composed of two or more filters for each of the R, G, and B signals, and data for which no signal voltage is applied among the two or more filters for each signal. In the case of the LCD panel formed by coating a barrier film on the exposure paper so as not to be exposed to light, it has an effect of obtaining a resolution twice or more with a relatively simple structure compared with the prior art.

Claims (2)

A decoder 1 that separates R, G, and B signals from an input video signal, and m × n (an integer of m ≧ 2) for n pixels within one horizontal period for each signal output from the decoder 1 To A / D converter 2 for sampling and converting into digital signals, a data storage unit 3 for storing the digital signals converted by the A / D converter 2, and the data storage unit 3 A D / A converter 4 for converting the data output from the analog signal into an analog signal, an LCD driver 5 for driving the LCD by receiving the converted analog signal from the D / A converter 4, and the LCD driver ( 5) one horizontal line of m × -1 data is first exposed on the exposed paper on one side of the R filter, the G filter, and the B filter, each of which has m lines. With a blocking film to block the application of the signal voltage so that the m × n data of Color video printer device using the LCD, characterized in that consisting of an LCD panel (6). The color video using the LCD according to claim 1, wherein the structure of the blocking film is configured to block two R, G, and B lines by 1/2 up and down of each line filter to improve resolution in the vertical direction. Printer device.