JP2002040984A - Display method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a display method of sub-pixel accuracy capable of corresponding to colors. SOLUTION: A three-times picture data is obtained, which is composed of sub-pixels having magnified raster picture to be displayed three times in a 1st direction in which the RGB light emitting elements are arranged. The three- times picture data is processed by filtering. Based on the result of the processing by filtering, a mixture ratio of the foreground color to the background color in each pixel is obtained. The foreground color and the background color of each pixel is obtained, and concerning each pixel, a mixed color having mixed the foreground color and the background color at sub-pixel level is obtained according to the obtained mixture ratio. A display device is made to perform color sub-pixel display according to this mixed color.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display method for a display device in which light emitting elements of three primary colors of RGB are juxtaposed.

[0002]

2. Description of the Related Art Conventionally, display devices using various display devices have been used. In such a display device, for example, three light-emitting elements each emitting three primary colors of RGB, such as a color LCD and a color plasma display, are arranged in a fixed order to form one pixel, and this pixel is a first pixel.
Are arranged side by side to form a line, and this line is
In some cases, a plurality of the display screens are provided in a second direction orthogonal to the direction of.

[0003] For example, there are many display devices, such as display devices mounted on mobile phones and mobile computers, which have relatively narrow display screens and are difficult to display finely. When an attempt is made to display a small character, a photograph, a complicated picture, or the like on such a display device, a part of the image tends to be crushed and become unclear.

[0004] In order to improve display clarity on a narrow screen, a document (subtitle: "Sub Pixel Font Re") on the Internet that utilizes a point where one pixel is composed of three RGB light emitting elements is used.
ndering Technology ”) has been published. The present inventors downloaded this document from a site (http://grc.com) or its subordinates and confirmed it on June 19, 2000.

Next, this technique will be described with reference to FIG.
explain. Hereinafter, as an example of an image to be displayed, an English character “A” will be described.

First, as shown in FIG. 7A, original image data is obtained. Then, as shown in FIG. 7B, triple original image data is obtained by enlarging this original image three times (the number of RGB light emitting elements) in the first direction. Next, FIG.
Based on the triple image data of (b), by a predetermined coefficient,
A filtering process for distributing energy to the three light-emitting elements (sub-pixels) of RGB is performed, and a sub-pixel display is performed as shown in FIG.

[0007]

However, in this display method, only black-and-white binary (or low-gradation gray scale) can be displayed, and at least one of the foreground color and the background color of the original image is color. There was a problem that it could not cope.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a display method with sub-pixel accuracy capable of supporting colors.

[0009]

According to the present invention, one pixel is formed by arranging three light emitting elements respectively emitting the three primary colors of RGB in a predetermined order, and the pixels are arranged side by side in a first direction. When a line is formed and a plurality of the lines are provided in a second direction orthogonal to the first direction, and a display device forming a display screen performs display, a raster image to be displayed this time is displayed in the first direction. Obtaining triple image data composed of sub-pixels three times enlarged, filtering the triple image data, and obtaining a mixture ratio of a foreground color and a background color of each pixel based on a result of the filtering processing Obtaining a foreground color and a background color of each pixel; and obtaining a mixed color obtained by mixing the foreground color and the background color at the sub-pixel level according to the obtained mixing ratio for each pixel. And flop, this mixed color, and a step of causing the color sub-pixels on the display device.

With this configuration, it is possible to realize display with subpixel accuracy corresponding to colors.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In the display method according to the first aspect, R
Three pixels that respectively emit the three primary colors of GB are arranged side by side in a fixed order to form one pixel, and these pixels are arranged side by side in a first direction to form one line, and this line is moved in the first direction. When a plurality of pixels are provided in a second direction orthogonal to each other and display is performed on a display device configuring a display screen, a raster image to be displayed this time is tripled in image data including subpixels that are three times enlarged in the first direction. , Filtering the tripled image data, obtaining a mixture ratio of the foreground and background colors of each pixel based on the filtering processing result, and acquiring the foreground and background colors of each pixel A step of obtaining, for each pixel, a mixed color obtained by mixing the foreground color and the background color at the sub-pixel level in accordance with the obtained mixing ratio;
Causing the display device to perform color sub-pixel display.

With this configuration, not only black-and-white display, but also when one or both of the background and foreground are color,
Sub-pixel display can be performed. Therefore, even in the color display, the display is easy to see by the sub-pixel display,
The sharpness of display can be improved by suppressing the collapse of characters and the like.

In the display method according to the second aspect, the mixture ratio is:
The value of the filtering result is obtained by normalization.

According to this configuration, the filtering result can be accurately reflected on the mixed color.

In the display method according to the third aspect, the value of the foreground color, the value of the background color, and the mixture ratio are expressed by 8 bits.

According to this configuration, the computer operation is facilitated, and the usability for the engineer is improved.

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram of a display device according to an embodiment of the present invention.

In FIG. 1, a display information input means 1 inputs display information. Further, the display control unit 2 controls each element in FIG. 1 to perform display on the display device 3 based on the display image stored in the display image storage unit 7 (such as VRAM) for sub-pixel display. Let

The display device 3 constitutes one pixel by arranging three light emitting elements respectively emitting the three primary colors of RGB in a predetermined order, and constitutes one line by arranging these pixels in the first direction. A plurality of such lines are provided in a second direction orthogonal to the first direction to form a display screen. In particular,
It comprises a color LCD, a color plasma display and the like, and a driver for driving each of these light emitting elements.

The triple image data storage unit 4 is a triple image (subpixel image corresponding to three light emitting elements of RGB) corresponding to display information that can be input from the display information input unit 1.
Is stored. Here, as shown in FIG. 4, triple image data as shown in FIG. 5 may be generated from ordinary non-triple original image data and stored in the triple image data storage means 4, The configuration may be such that the triple image data as shown in FIG. 5 is stored in the triple image data storage means 4 from the beginning.

The filtering unit 5 performs a filtering process on the triple image stored in the triple image data storage unit 4, and outputs the obtained value to the color mixing unit 6. It should be noted that the filter coefficient of the filtering processing means 5 may be such that energy is equally (1/3) distributed to each light emitting element as in the literature introduced in the section of "Prior Art". Note that this coefficient may be one stage or two stages or more.

Next, the processing of the color mixing means 6 will be described with reference to FIGS. Although FIG. 6 is originally a color multi-valued image, since it is inevitable to use black and white binary due to drawing restrictions, it is assumed that a pseudo-gradation display in which the color multi-valued image is patterned is performed in advance. I want to understand.

First, before the color mixing means 6 performs the processing, the filtering processing means 5 generates an image which looks achromatic as a whole as shown in the middle part on the left side of FIG. 6 based on the tripled image data of FIG. Generate This is the same as the conventional technology.

However, when the color mixing means 6 performs the following processing, it becomes possible to display sub-pixels corresponding to colors. For convenience of description, the following description is based on the assumption that the first direction is the x direction (horizontal direction in FIG. 6) and the second direction is the y direction, but the first direction and the second direction The present invention can be similarly applied even if xy is exchanged in accordance with.

At step 10 in FIG. 3, the color mixing means 6 inputs the value Val (x, y) of each pixel from the filtering processing means 5. And color mixing means 6
Normalizes this value Val (x, y) to 0.0 to 1.0. Of course, the significant figures may be variously changed in addition to two digits.

Here, in this example, the value Val (x, y) has an 8-bit precision, and the range of the value Val (x, y) is 0, 1, 2,..., 255.

Therefore, the color mixing means 6 sets the mixing ratio α (x,
y) = Val (x, y) / 255, each pixel (x,
y) to obtain a normalized mixture ratio α (x, y).

Next, the color mixing means 6 performs step 1 of FIG.
1, in step 12, the foreground color (Rf, Gf, Bf) (x, y) and background color (R
b, Gb, Bb) (x, y) (however, (x, y) will be abbreviated below for the color).

The processing order of steps 10, 11 and 12 can be changed in any order.

After obtaining the above information, the color mixing means 6 performs subpixel-accurate color mixing in step 13 by the following equation.

[0031]

(Equation 1) Note that in this expression, the x coordinate of the sub-pixel unit sx is used for the x coordinate of the mixture ratio α.

More preferably, the color mixing means 6 uses the following equation.

[0033]

(Equation 2) As described above, it is preferable to express the foreground color value, the background color value, and the mixture ratio with 8-bit precision because the calculation becomes easy. Of course, these equations are only examples, and other equivalent equations may be substituted.

By the above processing, as shown on the right side of FIG. 6, a mixed color (Rr, Gr, Br) of the pixel (x, y) is obtained. Here, the background color (Rb, Gb, Bb) can have different RGB values for each pixel (x, y), and the foreground color (Rf, Gf, Bf) can also be different for each pixel (x, y). It can have different RGB values.

Therefore, for example, a full-color background image can be displayed on the background, and a logo can be displayed on the front side, for example, using red characters. And at this time,
The characters (logo) on the front side are displayed in sub-pixels, and are displayed clearly and clearly.

Now, in FIG. 1, the display image storage means 7
Consists of a VRAM or the like for storing a color image with sub-pixel accuracy after the color mixing means 6 has mixed.

Based on the above description, the flow of the display method according to the present embodiment will now be described with reference to FIG.
First, in step 1, display information is input to the display information input means 1.

Then, from the triple image data storage means 4,
A triple image (sub-pixel image) corresponding to the input display information is extracted (step 2). This image is typically raster font data, but may of course be any image other than fonts.

Next, at step 3, the display control means 2
Passes the acquired tripled image to the filtering processing unit 5, and the filtering processing unit 5 performs a filtering process.

After the filtering processing is completed, the filtering processing means 5 passes the processed image data to the color mixing means 6. Then, in step 4, the color mixing means 6
As described above, the color mixing process is performed, and the sub-pixel color image after the color mixing is stored in the display image storage unit 7 (Step 5).

Then, at step 6, the display control means 2
Causes the display device 3 to perform display based on the color image stored in the display image storage means 7. Then, as long as the display is not completed (Step 7), the display control means 2 returns the processing to Step 1.

[0042]

According to the present invention, the sub-pixel display can be made color-compatible, and the range in which the sub-pixel can be displayed can be greatly expanded. In other words, since the sub-pixel display can be performed in the color display, the sharpness of the color display is improved.

[Brief description of the drawings]

FIG. 1 is a block diagram of a display device according to an embodiment of the present invention.

FIG. 2 is a flowchart of a display device according to an embodiment of the present invention.

FIG. 3 is a flowchart of a color mixing process according to an embodiment of the present invention.

FIG. 4 is a view showing an example of an original image according to the embodiment of the present invention;

FIG. 5 is a view showing an example of a 3 × image according to the embodiment of the present invention;

FIG. 6 is an explanatory diagram of a color mixing process according to an embodiment of the present invention.

7A is a diagram illustrating a conventional original image, FIG. 7B is a diagram illustrating a conventional triple image, and FIG. 7C is an explanatory diagram of a conventional filtering process.

[Explanation of symbols]

 2 display control means 3 display device 4 tripled image data storage means 5 filtering processing means 6 color mixing means 7 display image storage means

Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat II (Reference) H04N 9/12 H04N 9/12 B 9/64 9/64 F (72) Inventor Bunpei Taji 1006 Odakadoma, Kadoma-shi, Osaka Address F-term in Matsushita Electric Industrial Co., Ltd. (reference) KE03 KE07 KM11 KM13 KM15 5C080 AA05 AA06 AA10 BB05 CC03 DD03 EE30 JJ01 JJ02 JJ07

Claims (3)

[Claims] 1. A pixel is formed by arranging three light-emitting elements respectively emitting three primary colors of RGB in a predetermined order, and forming one line by arranging these pixels in a first direction. A plurality is provided in a second direction orthogonal to the first direction,
Obtaining a triple image data consisting of sub-pixels obtained by expanding a raster image to be displayed this time by three times in the first direction in order to cause a display device constituting a display screen to perform display; Filtering, a step of obtaining a mixture ratio of foreground and background colors of each pixel based on a result of the filtering, a step of obtaining a foreground and background color of each pixel, and a step of obtaining Displaying a mixed color obtained by mixing a foreground color and a background color at a sub-pixel level according to a mixing ratio; and causing the display device to perform color sub-pixel display using the mixed color. Method. 2. The display method according to claim 1, wherein the mixture ratio is obtained by normalizing a value of a filtering result. 3. The display method according to claim 1, wherein the value of the foreground color, the value of the background color, and the mixture ratio are expressed by 8 bits.