KR20010051414A - Display device and display method using single liquid crystal display panel - Google Patents

Abstract

PURPOSE: Display device and method using a single liquid crystal display panel are to lower a decrease amount of luminance and provide an algorithm for converting R/G/G signals into R/G/B/W signals. CONSTITUTION: A signal processing part(301) receives R, G, B signals, performs an offset control, contrast and brightness control, and gamma correction and outputs Ri/Gi/Bi signals. A timing control part(302) receives a vertical synchronous signal and a horizontal synchronous signal and controls a color switching unit. A standard converting part(303) converts the Ri/Gi/Bi signals into Ro/Go/Bo/W signals using a four color sequence converting algorithm. An optical engine(304) projects an image having the Ro/Go/Bo/W signals output from the standard converting part onto a screen(305). The optical engine includes a single LCD panel for transmit an incident light in response to data of the R/G/B/W signals.

Description

Display device and method using single liquid crystal display panel

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display apparatus and method, and more particularly, to a display apparatus and method using a single liquid crystal display panel for minimizing the amount of reduction in brightness using a single liquid crystal element.

Digitally driven display devices include a plasma display panel (PDP), a liquid crystal display panel (LCD panel), and a ferro electric liquid crystal panel (FLC panel).

The FLC panel has a structure in which ferroelectric liquid crystal is injected between an optical plane mirror formed on a silicon substrate and glass, and has a wider viewing angle and faster response speed than conventional products.

As shown in FIG. 1, a display apparatus using a single LCD panel according to a technology related to the present invention includes a signal processor, a timing controller, an optical engine, and a screen.

Here, the optical engine includes a color switch, an FLC panel, a light source of an optical system, a collimating lens, a polarizing beam splitter, a projection lens, and the like.

The signal processing unit inputs R, G, and B signals, adjusts offset control, contrast and brightness, performs signal processing such as gamma correction, and then displays R / G / B data vertically in units of fields for display on the LCD panel. It is generated in accordance with the synchronization signal.

The timing controller inputs the vertical synchronizing signal and the horizontal synchronizing signal to generate a switching control signal for controlling the color switch.

In the optical engine, the light generated by the light source transmits R, G, and B light sequentially by the color switch, and transmits the transmitted R, G, and B light corresponding to the R / G / B data in the LCD panel. After reflection, it outputs to a screen through an optical system.

In order to display color with a single LCD panel according to the related art, R / G / B is time-divided by 1/3 vertical period for one vertical period of a signal. As shown in FIG. 2, the maximum brightness is calculated as shown in FIG. 2. Since the light amount is 1/3 in R / G / B, and the output time is 1/3, the maximum brightness is 1 / which is the sum of the light quantity multiplied by the time. It becomes 3.

That is, the maximum brightness is only one third level than the case of using three LCD panels displaying R / G / B separately, which causes the screen to be dark due to the decrease in luminance.

The technical problem to be solved by the present invention is a single liquid crystal display panel for improving the amount of reduction in brightness to 1/2 level compared to the case of employing three LCD panels even when using a single LCD panel to solve the above problems. The present invention provides a display apparatus and method using the same.

Another object of the present invention is to provide an algorithm for converting an R / G / B signal into an R / G / B / W signal in order to improve luminance.

Another object of the present invention is to provide a display apparatus and method for improving luminance by adding achromatic colors to an image projected by a projection element.

1 is a block diagram of a display device using a single liquid crystal display panel according to a technology related to the present invention.

Figure 2 shows the amount of light, time and luminance amount according to the three-color sequence method according to the prior art.

3 is a configuration diagram of a display device using a single liquid crystal display panel according to the present invention.

Figure 4 shows the amount of light, time and luminance according to the four-color sequence method according to the present invention.

FIG. 5 is a detailed configuration diagram of a first embodiment of the optical engine shown in FIG. 3.

FIG. 6 is a detailed configuration diagram of a second embodiment of the optical engine shown in FIG. 3.

7 illustrates an algorithm for converting 3 colors to 4 colors applied to the present invention.

8 illustrates a color vector for explaining a four color transform algorithm according to the present invention.

In order to achieve the above technical problem, a display device using a single liquid crystal display panel according to the present invention, in a display device using a single liquid crystal display panel, inputs a Ri / Gi / Bi signal corresponding to one vertical period, A standard conversion unit and a Ro / Go output from the standard conversion unit for generating a Ro / Go / Bo / W signal for each vertical period that compensates for the loss of chromaticity by a control signal for controlling the panel and a predetermined algorithm. And an optical engine for sequentially outputting four-color signals to the screen according to the control signal corresponding to the / Bo / W signal.

In order to achieve the above technical problem, a display method using a single liquid crystal display panel according to the present invention is a display method using a liquid crystal display panel of a single panel, comprising: (a) forming a color video signal when synthesized in an image processing apparatus; Receiving a plurality of color data signals having separate spectra, (b) obtaining a vector value of each of the color data signals, (c) obtaining an initial minimum value among the respective vector values, and (d) Determining an initial minimum value of each vector value as a first operation value of the achromatic color signal, and (e) determining a compensation value of each color data signal by adding the color data signal to a vector value of the color data signal. (F) subtracting the first operation value from the compensation value of the respective color data signal, respectively. Determining a color component and determining an image displayed by color data and achromatic color.

As shown in FIG. 3, a display apparatus using a single liquid crystal display panel according to the present invention includes a signal processor 301, a timing controller 302, a standard converter 303, an optical engine 304, and a screen 305. ). The optical engine 304 is constituted by the display means of a single liquid crystal panel.

In detail, as shown in FIG. 5, the optical engine 304 according to the first embodiment includes a light source 501, a collimating lens 502, a color switching means 503, and a liquid crystal display panel (LCD panel) 504. And a projection lens 505.

As shown in FIG. 6, the optical engine 304 according to the second embodiment includes a light source 601, a collimating lens 602, a color switching means 603, a polarization beam splitter 604, and a ferroelectric liquid crystal. It consists of a panel 605 and a projection lens 605.

The signal processing unit 301 inputs R, G, and B signals, adjusts offset control, contrast and brightness, performs signal processing such as gamma correction, and then Ri / Gi / corresponding to a three-color sequence display system. Output Bi signal.

The timing controller 302 inputs the vertical synchronizing signal and the horizontal synchronizing signal to generate a switching control signal for controlling the color switching means.

The standard converter 303 converts the input signal Ri / Gi / Bi into Ro / Go / Bo / W by a four-color sequence conversion algorithm.

As shown in Fig. 4, the maximum brightness (Ymax1) by the image display method by the Ro / Go / Bo / W four-color sequence algorithm is the sum of the product of the light amount and time of each of Ro, Go, Bo, and W. Therefore, it is calculated as in Equation 1.

On the contrary, since the maximum brightness (Ymax2) according to the image display method using the R / G / B 3-color sequence algorithm according to the related art shown in FIG. 2 is the sum of the product of the light amount and time of each of R, G, and B, It is calculated as in Equation 2.

Therefore, the maximum brightness Ymax1 by the image display method by the Ro / Go / Bo / W 4-color sequence algorithm according to the present invention is determined by the R / G / B 3-color sequence display system according to the prior art. It can be seen that the luminance is improved by about 1/6 of the maximum luminance Ymax2 in the display method.

However, simply adding an achromatic color (W) without changing the input Ri / Gi / Bi improves the brightness of the brightness, but the color shifts toward the achromatic color, resulting in a desaturation of the color.

6 is a flow chart of FIG. 6 for preventing a transition to the achromatic vector direction due to the addition of the achromatic color W by the Ro / Go / Bo / W four-color sequence conversion algorithm executed by the standard conversion unit 303. The explanation will be centered.

When the Ri, Gi, Bi input signals are input (step 701), the IncY value for determining the increase in luminance is determined by the following equation (3) or (4) (step 702).

That is, the IncY value is selected as the minimum value among the Ri, Gi, and Bi values, or determined as an average value.

Then, the vector_R, G, and B values are calculated as in Equations 5, 6, and 7 (step 703).

Here, sel is a scale constant, which can be experimentally determined according to a system condition. If sel is too large, an unexpressable case occurs. If sel is too small, the amount of luminance compensation is small and the effect of luminance improvement can be reduced. Thus, sel is 1≤sel≤ It is effective to determine appropriately within the range of.

Then, the achromatic (W) value to be used in the four color sequence display system is selected as the minimum among vector_R, vector_G, and vector_B (step 704).

Through this process, achromatic color (W) to be added to improve luminance was obtained.

Next, to compensate for the shift of the input color in the achromatic vector direction due to the addition of the achromatic color W, an operation as shown in Equations 8, 9 and 10 is executed (step 605).

Then, Ro, Go, and Bo are compensated for by the equations 11, 12, and 13 to compensate for the transition to the achromatic vector direction (steps 706 and 707).

Ro = Rv-W

Go = Gv-W

Bo = Bv-W

According to the above algorithm, the luminance was increased due to the addition of the achromatic color W, and the luminance was increased by adding vector_R, vector_G, and vector_B to the input signals Ri, Gi, and Bi as shown in Equations 8, 9, and 10, respectively. . Then, by subtracting the achromatic W value added to Rv, Gv, and Bv calculated as in Equations 11, 12, and 13 equally, the distance from the achromatic vector direction is compensated.

That is, as illustrated in FIG. 8, for convenience of description, the present invention will be described below by considering only R and G vectors without considering B vectors.

First, if the vector of the input color signal C1 is skewed in the R vector direction based on the achromatic color, adding the calculated achromatic color W to the C1 vector will shift in the achromatic direction. However, if the vector obtained by subtracting the same value W from the R vector and the G vector from the input color signal C1 vector multiplied by the scaling constant or the like will transition in the R vector direction (arrow direction). Thus, the final output synthesis vector will be approximately equal to the phase of the original C1 vector.

In this way, even if the input color signal C2 is calculated by the algorithm according to the present invention, this time, it shifts in the G vector direction (arrow direction) away from achromatic color, and finally draws a composite vector including W, which is almost the phase of the C2 vector. You lose.

The operation displayed on the screen 305 by applying Ro / Go / Bo / W data output from the standard conversion unit 303 to the optical engine 304 by the four-color conversion algorithm will be described.

First, a first embodiment of the optical engine shown in FIG. 5 will be described.

The light source 501 consists of a lamp that generates light and a reflector that reflects the light emitted from the lamp and guides its path to emit light.

The collimating lens 502 converts the light emitted from the light source 501 into parallel light or focused light and outputs the light.

The color switching means 503 is configured as an LCD shutter or color wheel type, and the light incident from the collimating lens 502 is applied to the R, G, B, W by the color switching control signal applied from the timing controller 302. Four colors are sequentially switched in quarter vertical periods during one vertical period. That is, during the initial quarter vertical period, only the wavelength corresponding to R of the incident light is transmitted and the remaining wavelength is blocked. During the next quarter vertical period, only the wavelength corresponding to G is transmitted and the remaining wavelength is blocked. Then, the wavelengths for B and W are sequentially switched through for 1/4 vertical periods.

The liquid crystal display panel 504 is disposed on the optical path output from the color switching means 503, and is applied to the Ro / Go / Bo / W data applied from the standard converter 303 to the data line of each cell composed of the matrix. Correspondingly, incident light is transmitted by the clock and panel control signals.

The projection lens 505 enlarges and projects the light transmitted from the liquid crystal display panel 504 toward the screen 506.

Next, a second embodiment of the optical engine shown in FIG. 6 will be described.

In the optical engine 304 according to the first embodiment, a transmissive liquid crystal display panel is used, whereas in the second embodiment, a reflective ferroelectric liquid crystal panel is used.

The transmissive liquid crystal panel transmits light incident to the data value input to the data line and displays the image. The reflective ferroelectric liquid crystal panel reflects light incident to the data value input to the data line and displays the image. Is displayed.

The light source 601 consists of a lamp that generates light and a reflector that reflects the light emitted from the lamp and guides its path to emit light.

The collimating lens 602 converts the light emitted from the light source 601 into parallel light or focused light and outputs the light.

The color switching means 603 is composed of an LCD shutter or a color wheel type, and the light incident from the collimating lens 602 is applied to the R, G, B, W by the color switching control signal applied from the timing controller 302. Four colors are sequentially switched in quarter vertical periods during one vertical period. That is, during the initial quarter vertical period, only the wavelength corresponding to R of the incident light is transmitted and the remaining wavelength is blocked. During the next quarter vertical period, only the wavelength corresponding to G is transmitted and the remaining wavelength is blocked. Then, the wavelengths for B and W are sequentially switched through for 1/4 vertical periods.

The polarization beam splitter 604 reflects the S-wave light from the light incident from the color switching means 603 and enters the ferroelectric liquid crystal panel 605, and transmits the P-wave light as it is.

The ferroelectric liquid crystal panel 605 polarizes incident light by a clock and panel control signal corresponding to a Ro / Go / Bo / W data value applied by the standard converter 303 to data lines of each cell composed of a matrix. Reflected by 604, an image of each pixel is represented.

Then, the polarization beam splitter 604 transmits P-wave light as it is from the light reflected from the ferroelectric liquid crystal panel 605 to enter the projection lens 606, and reflects the S-wave light.

The projection lens 606 enlarges and projects the light incident from the polarization beam splitter 604 toward the screen 607.

By the above operation, the amount of luminance displayed using a single LCD panel or FLC panel by four color sequences can be increased, and the chroma can be prevented from falling due to the addition of achromatic color.

The optical engine described in the present invention has been simplified and expressed for convenience of description, but in order to improve the image quality such as contrast, a glass polarizer, various circuits, cubes, etc. may be added, and the position of the collimating lens may be changed. Changing is well known in the art of optical engine design.

As described above, according to the present invention, even when displaying using a single transmissive LCD panel or a reflective FLC panel, the conventional technique is compensated for by the four-color conversion algorithm to compensate for the desaturation due to the increase in luminance due to achromatic color. Compared to this, the brightness of the screen is brighter and colors can be displayed in more vivid colors.

Claims (47)

In the display method using a liquid crystal display panel of a single panel, (a) receiving a plurality of color data signals having distinct spectra that form a color video signal when synthesized in an image processing apparatus; (b) obtaining a vector value of each of the color data signals; (c) obtaining an initial minimum value among the respective vector values; (d) determining an initial minimum value of each vector value as a first operation value of the achromatic signal; (e) determining a compensation value of each color data signal by adding the color data signal to a vector value of the color data signal; And (f) subtracting the first operation value from each compensation value of each color data signal to determine a color component and determining an image to be displayed by color data and achromatic color. Display method using a liquid crystal display panel. The display method according to claim 1, wherein the color data signal comprises a red (R) signal, a blue (B) signal, and a green (G) signal. The display method according to claim 1, further comprising projecting an image of the color component determined in step (f) onto a screen through a single liquid crystal display panel. The display method according to claim 1, further comprising projecting an image on the screen through the single ferroelectric liquid crystal display panel of the color component determined in step (f). The display method according to claim 1, further comprising determining a luminance value among the respective color data signals. 6. The single liquid crystal of claim 5, further comprising the step of determining a compensation value by multiplying the quotient of one color signal by the square root of the sum of squares of each color data signal and the luminance value and the scale constant. Display method using a display panel. The display method according to claim 6, wherein the scale constant is determined according to the characteristics of the image processing apparatus. The method of claim 6, wherein the scale constant is 1 and A display method using a single liquid crystal display panel, characterized in that determined by a value within the range between. The display method according to claim 5, wherein a luminance value is determined by calculating a minimum value among the respective color data signals. The display method according to claim 5, wherein the luminance value is determined by calculating an average value of each of the color data signals. 4. The display method according to claim 3, wherein the color data signal comprises a red (R) signal, a blue (B) signal, and a green (G) signal. 5. The single liquid crystal of claim 4, further comprising multiplying the quotient of one color signal by the square root of the sum of squares of each color data signal and the luminance value and the scale constant to determine a compensation value. Display method using a display panel. The display method according to claim 1, wherein the plurality of color data signals are divided by a time axis in a single digital signal. A single liquid crystal display panel as claimed in claim 1, further comprising the step of outputting a color component comprising an achromatic color divided by a time axis in a digital signal used by an optical engine to project an image onto a screen. Display method used. The display method according to claim 1, wherein the optical engine comprises at least one liquid crystal display panel or a ferroelectric liquid crystal display panel. In a display device using a liquid crystal display panel of a single panel, A signal processor for receiving R, G, and B signals and synchronizing and generating R / G / B signals that form a color video signal when synthesized; A timing controller for receiving a vertical and horizontal synchronization signal and generating a color switching control signal for controlling the color switch; A standard converter for inputting the R / G / B signal and converting the signal into a Ro / Go / Bo / W signal; And And an optical engine for projecting an image having the Ro / Go / Bo / W signal output from the standard converting unit. 17. The apparatus of claim 16, wherein the standard converter determines a luminance value among respective R, G, and B signals, determines a vector value for each of the R, G, and B signals, and determines each of the R, G, and B vector values. Determine an initial minimum value, and determine the initial minimum value for each vector value as a first operation value of the achromatic color signal, and add R, G, and B signals to the respective vector values, respectively, for the R, G, and B signals. And determining an output color component by subtracting each compensation value and subtracting the first operation value from each compensation value of the R, G, and B signals. 17. The display apparatus according to claim 16, wherein the optical engine includes a single liquid crystal display panel that transmits incident light corresponding to data of an R / G / B / W signal. 19. The apparatus of claim 18, wherein the standard converter determines a luminance value among respective R, G, and B signals, determines a vector value for each of the R, G, and B signals, and determines each of the R, G, and B vector values. Determine an initial minimum value, and determine the initial minimum value for each vector value as a first operation value of the achromatic color signal, and add R, G, and B signals to the respective vector values, respectively, for the R, G, and B signals. And determining an output color component by subtracting each compensation value and subtracting the first operation value from each compensation value of the R, G, and B signals. 13. The display apparatus according to claim 12, wherein the optical engine includes a single ferroelectric liquid crystal display panel for displaying an image by reflecting incident light corresponding to a data value input to a data line. . 21. The apparatus of claim 20, wherein the standard converter determines a luminance value among respective R, G, and B signals, determines a vector value for each of the R, G, and B signals, and determines each of the R, G, and B vector values. Determine an initial minimum value, and determine the initial minimum value for each vector value as a first operation value of the achromatic color signal, and add R, G, and B signals to the respective vector values, respectively, for the R, G, and B signals. And determining an output color component by subtracting each compensation value and subtracting the first operation value from each compensation value of the R, G, and B signals. The optical engine of claim 16, wherein the optical engine is A light source for generating light and a reflection mirror for reflecting light emitted from the light source; A collimating lens for adjusting the light emitted from the light source into parallel light or focused light; Color switching means for receiving the light output from the collimating lens and sequentially switching the R, G, B, W optical signals at predetermined intervals during one vertical period according to the color switching control signal received from the timing controller. ; And And a ferroelectric liquid crystal display panel for reflecting light input from the color switching means according to the R / G / B / W data signal applied by the standard conversion unit to form an image. Display device using the. 23. The apparatus of claim 22, wherein the standard converter determines a luminance value among respective R, G, and B signals, determines a vector value for each of the R, G, and B signals, and determines each of the R, G, and B vector values. Determine an initial minimum value, and determine the initial minimum value for each vector value as a first operation value of the achromatic color signal, and add R, G, and B signals to the respective vector values, respectively, for the R, G, and B signals. And determining an output color component by subtracting each compensation value and subtracting the first operation value from each compensation value of the R, G, and B signals. The optical engine of claim 16, wherein the optical engine is A light source for generating light and a reflection mirror for reflecting light emitted from the light source; A collimating lens for adjusting the light emitted from the light source into parallel light or focused light; Color switching means for receiving the light output from the collimating lens and sequentially switching the R, G, B, W optical signals at predetermined intervals during one vertical period according to the color switching control signal received from the timing controller. ; And And a ferroelectric liquid crystal display panel which transmits the light input from the color switching means according to the R / G / B / W data signal applied by the standard conversion unit to form an image. Display device using the. 17. A single liquid crystal display panel as claimed in claim 16, characterized in that it is divided into R / G / B / W signals on a time axis by the standard converter in a single digital signal sent to the optical engine for displaying an image on a screen. Display device using the. In the display method using a liquid crystal display panel of a single panel, (a) receiving R, G and B signals at the image processing apparatus; (b) determining a luminance value among the R, G, and B signals; (c) determining a vector value of each of the R, G, and B signals; (d) obtaining an initial minimum value among the respective vector values; (e) determining an initial minimum value of each vector value as a first operation value of the achromatic signal; determining a compensation value of each color signal by adding the R, G and B signals to the vector value of each of the R, G and B signals; And (g) subtracting the first operation value from each compensation value of each color signal to determine a color component, and determining a displayed image according to color data and achromatic color. Display method using a display panel. 27. The method of claim 26, wherein the output color component has an achromatic signal and further comprises transmitting through a single liquid crystal display panel to display an image on a screen. . 28. The method of claim 27, further comprising: determining a compensation value by multiplying the quotient of one color signal by the square root of the sum of squares of the respective R, G, and B signals, and the luminance value and the scale constant. Display method using a single liquid crystal display panel. 29. The display method according to claim 28, wherein the scale constant is determined according to the characteristics of the image processing apparatus. The method of claim 29, wherein the scale constant is 1 and A display method using a single liquid crystal display panel, characterized in that determined by a value within the range between. The display method according to claim 30, wherein the luminance value is determined by calculating a minimum value among the signals of R, G, and B. 32. The display method according to claim 31, wherein the luminance value is determined by calculating an average value of each of the R, G, and B signals. 27. The method of claim 26, further comprising transmitting the output color component through a single ferroelectric liquid crystal panel to project an image onto the screen. 36. The method of claim 35, further comprising multiplying the quotient of one color signal by the square root of the sum of the squares of each of the R, G, and B signals and the luminance value and the scale constant to determine a compensation value. Display method using a single liquid crystal display panel. 35. The display method according to claim 34, wherein the scale constant is determined according to the characteristics of the image processing apparatus. The method of claim 34, wherein the scale constant is 1 and A display method using a single liquid crystal display panel, characterized in that determined by a value within the range between. 36. The display method according to claim 35, wherein a luminance value is determined by calculating a minimum value among the signals of R, G, and B. 36. The display method according to claim 35, wherein the luminance value is determined by calculating an average value of each of the R, G, and B signals. In a display device using a liquid crystal display panel of a single panel, Input Ri / Gi / Bi signals corresponding to one vertical period, and generate the Ro / Go / Bo / W signal for each vertical period by compensating the loss of chromaticity by a control signal for controlling the display panel and a predetermined algorithm. A standard conversion unit to make it; And A single liquid crystal display comprising an optical engine for sequentially outputting a four-color signal on the screen by the control signal corresponding to the Ro / Go / Bo / W signal output from the standard conversion unit Display device using panel. 40. The system of claim 39, wherein the optical engine A light source for generating and projecting light; A collimating lens for converting the light projected from the light source into parallel light or focused light; Color switching means for inputting the light incident from the collimating lens and switching and outputting the R / G / B / W signals sequentially during the one vertical period; A liquid crystal display in which the light output from the color switching means is incident and the incident light is transmitted by the control signal corresponding to the Ro / Go / Bo / W signal applied to the data line of each cell composed of a matrix to express an image. panel; And And a projection lens that enlarges and projects the light transmitted through the liquid crystal display panel toward the screen. 40. The system of claim 39, wherein the optical engine A light source for generating and projecting light; A collimating lens for converting the light projected from the light source into parallel light or focused light; Color switching means for inputting the light incident from the collimating lens and switching and outputting the R / G / B / W signals sequentially during the one vertical period; A polarization beam splitter which transmits or reflects the light incident from the color switching means according to polarization to change the traveling path of the incident light; The polarization beam splitter is disposed on an optical path that is transmitted or reflected by the polarization beam splitter and receives incident light by the control signal corresponding to the Ro / Go / Bo / W signal applied to the data line of each cell composed of a matrix. A ferroelectric liquid crystal panel that reflects the light and displays an image; And And a projection lens that reflects from the ferroelectric liquid crystal panel and enlarges and projects the light passing through the polarization beam splitter toward the screen. 40. The system of claim 39 wherein the predetermined algorithm is (a) obtaining a value Inc corresponding to the minimum value among the input signals Ri, Gi, and Bi signals; (b) calculating a unit vector component of Ri, Gi, and Bi from the input signal, and multiplying this value by a value obtained by multiplying IncY by a predetermined scale value (sel) to calculate vector_R, vector_G, and vector_B values; (c) determining a minimum value among the values of vector_R, vector_G, and vector_B as a magnitude value of achromatic color (W); And (d) adding vector_R, vector_G, and vector_B values to each of the input signals (Ri, Gi, Bi signals), and subtracting the achromatic color (W) to each of these values to generate a Ro / Go / Bo / W signal. Display device using a single liquid crystal display panel, characterized in that it comprises a. 43. The apparatus of claim 42, wherein the predetermined scale value sel is 1 ≦ sel ≦. Display device using a single liquid crystal display panel, characterized in that set in the range of. 40. The system of claim 39 wherein the predetermined algorithm is (a ') obtaining a value IncY' corresponding to an average value of the input signals Ri, Gi, and Bi signals; (b ') calculating unit vector components of Ri, Gi, and Bi from the input signal, and multiplying this value by the product of IncY' and a predetermined scale value (sel) to calculate vector_R, vector_G, and vector_B. step; (c ') determining a minimum value among the values of vector_R, vector_G, and vector_B as a magnitude value of achromatic color (W); And (d ') adding vector_R, vector_G, and vector_B values to each of the input signals Ri, Gi, and Bi, and subtracting the achromatic color W to each of these values to generate a Ro / Go / Bo / W signal. Display device using a single liquid crystal display panel comprising a. 45. The method of claim 44, wherein the predetermined scale value sel is 1≤sel≤ Display device using a single liquid crystal display panel, characterized in that set in the range of. 41. The display device according to claim 40, wherein the color switching means operates to uniformly switch and output the R / G / B / W signals for one vertical period, respectively. 42. The display device according to claim 41, wherein the color switching means is operated to uniformly switch and output the R / G / B / W signals for one vertical period, respectively.