JPH1010998A - Colour display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the recognizable and sharp colour pixel display and colour graphic display which do not give the feeling of physical disorder to the user's eyes, and which have high display quality or have no dispersion in the distribution of luminescent intensity, by diagonally arranging a picture element of the highest intensity among at least red, green and blue three pixels forming a compound picture element, so that it is not arranged vertically or horizontally. SOLUTION: A compound picture element 100 has G(green), R(red), B(blue) and W(white) four picture elements, and the G and W pixels having comparatively high luminescent intensity are diagonally arranged for preventing the horizontal or vertical arrangement. Thereby the difference in display quality between the upper and lower areas, and the left and right areas, can be prevented. In the compound picture element formed by the R(red), G(green) and B(blue) three pixels, the compound picture element is arranged in matrix, so that the G(green) is diagonally arranged in the case when the pixel is not divided, thereby the difference in display quality between the upper and lower areas, and the left and right areas, can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a color image display,
The present invention relates to a color display device that performs multi-color display suitable for color graphic display, and particularly relates to an arrangement of a plurality of pixels forming a picture element.

[0002]

2. Description of the Related Art In a conventional color display device, a plurality of pixels, for example, red (red), green (green), and blue (blue) as disclosed in Japanese Patent Publication Nos. 4-54207 and 4-355722. , 4 pixels of white (white)
2. Description of the Related Art There is provided a display device having a display panel for displaying characters and the like in color as picture elements.

[0003]

By the way, there is provided a display panel in which four pixels of R (red), G (green), B (blue) and W (white) shown in FIG. In the conventional color display device, when a linear display is performed, there is a problem that the widths of the vertical line L1 and the horizontal line L2 are different as shown in FIG.

When characters are displayed, FIG.
As shown in (a) and (b), the vertical line is thick and the horizontal line is thin. For this reason, for example, there is a problem that a Gothic character looks like a Mincho type character, the display becomes inferior in character quality, and a font design or the like cannot be accurately reproduced.

[0005] When the cause is analyzed, it has been found that the light emission distribution of the luminance affecting the display is different depending on the combination (configuration) of the pixels. FIG. 14 shows the light emission distribution of luminance, (a) represents and shows the luminance distribution of a ₂ part of the vertical line L1 of FIG. 12 in the pixel 100 having the structure shown in FIG. 11, (b ) shows the luminance distribution of b ₂ parts of horizontal lines L2 in FIG. 12.

[0006] If these are assumed to be 50% of the entire luminance to the eyes, G (green) and W (white) having high luminance are shown in FIG.
As shown in FIG. 1, the vertical line L1 has a luminance width (line width) W41 for two pixels as shown in (a), but the horizontal line L2 has high luminance G (green), W (White)
Are arranged in a line, and the luminance width (line width) cannot be obtained with the luminances of R (red) and B (blue), so that the luminance width W42 is the luminance width of the vertical line L1 as shown in (b). It becomes narrower than W41. Such a difference in luminance width between the vertical line L1 and the horizontal line L2 causes a difference in display quality between the upper, lower, left, and right sides.

SUMMARY OF THE INVENTION The present invention has been made to solve such a conventional problem, and has as its object to provide a color display device capable of improving display quality.

[0008]

According to the present invention, there is provided a color display device having a display panel for displaying characters and the like in color by a picture element having a plurality of pixels, wherein the picture element is red,
It has four pixels of green, blue, and white, and has a configuration in which high-luminance pixels among the four pixels are arranged diagonally.

Further, the present invention is characterized in that the high-luminance pixels arranged diagonally are green and white.

According to the present invention, there is provided a color display device comprising a display panel for displaying characters and the like in color by a picture element having a plurality of pixels, wherein the picture element has three pixels of red, green and blue. And the pixels having high luminance among the three pixels are arranged in a matrix so as to be located diagonally.

According to another aspect of the present invention, there is provided a color display device including a display panel for displaying characters and the like in color by a picture element having a plurality of pixels, wherein the picture element has three pixels of red, green and blue. In addition, the three pixels are divided so that pixels having high luminance among the three pixels are located diagonally.

Further, the present invention is characterized in that the high-luminance pixels arranged diagonally are green.

Further, the present invention provides the display panel, wherein the display panel includes a liquid crystal sandwiched between a pair of substrates, a plurality of electrodes formed on one of the substrates, and the electrodes formed on the other of the substrates. It is characterized by having a plurality of color filters and counter electrodes formed correspondingly.

Also, as in the present invention, the picture elements are red, green,
It is composed of four pixels of blue and white, and by arranging the green and white pixels of high luminance among the four pixels diagonally, the pixels of high luminance are not arranged horizontally or vertically. There is no difference in display quality between the top, bottom, left and right.

Further, the picture elements are composed of three pixels of red, green and blue, and the picture elements are arranged in a matrix so that the pixels with high luminance are located diagonally, so that the pixels with high luminance are horizontal. Alternatively, the display quality is not vertically aligned so that there is no difference in display quality between the upper, lower, left, and right sides.

Further, a picture element is composed of three pixels of red, green and blue, and is divided so that pixels having high luminance are located diagonally, so that pixels having high luminance are arranged horizontally or vertically. So that there is no difference in display quality between top, bottom, left and right.

[0017]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a diagram showing a configuration of a display panel of a color display device according to an embodiment of the present invention. In FIG. 1, reference numeral 1 denotes a liquid crystal display panel which is an example of a display panel;
01 selects each scanning line 102 and the selected scanning line 10
Reference numeral 2 denotes a scanning line driver that outputs a driving waveform at a predetermined timing. Reference numeral 103 denotes an information line driver that outputs a predetermined driving waveform to the information line 104 at a predetermined timing according to a video input signal.

Reference numeral 100 denotes picture elements arranged in a matrix, and an information signal is supplied from the information signal line 104 and a scanning signal is supplied from the scanning line 102 to each of the picture elements 100. .

FIG. 2 is a sectional view of the liquid crystal display panel 1. In FIG. 2, reference numerals 1a and 1b denote a pair of substrates for holding the liquid crystal 4. A plurality of electrodes 2a are provided on one substrate 1a, and one substrate 1a is provided on the other substrate 1b.
The color filter 7 and the counter electrode 2 correspond to the
b is formed. Note that, in FIG.
Is an orientation control film, 5 is a flattening film, and 6 is a light shielding layer.

FIG. 3 shows the structure of the picture element 100. This picture element 100, which is a first example of the present embodiment, has G (green), R (red), and B (blue). ), W (white)
In addition to the four pixels described above, G (green) and W (white) having relatively high light emission luminance are arranged diagonally as shown in the figure so as not to be horizontal or vertical. It is.

FIG. 4 shows one vertical and horizontal line displayed on the liquid crystal display panel 1 having the picture elements 100 having such a configuration. 5A and 5B show a light emission distribution of luminance. FIG. 5A shows a luminance distribution at a ₁ portion of a vertical line L1 in FIG. 4 in the pixel 100 having the pixel configuration shown in FIG.
Shows the luminance distribution of b ₁ part of the horizontal line L2 in FIG.

Here, as apparent from FIG. 5, the line width W11 of the vertical line L1 and the horizontal line L
2 is almost equal to the line width W12. Also,
When characters are displayed in such a state that the line widths of the vertical line L1 and the horizontal line L2 are substantially equal, an image having a relatively uniform character width in the vertical and horizontal directions is displayed as shown in FIGS. 6 (a) and 6 (b). become.

As described above, G (green) and W
By disposing the (white) pixels diagonally so that pixels with high luminance are not arranged horizontally or vertically, it is possible to prevent a difference in display quality between the upper, lower, left, and right directions. As a result, it is possible to prevent an error such as the appearance of a Gothic character but to appear in the Mincho style, and to accurately reproduce the font design.

Next, a second example of the present embodiment will be described.

FIG. 7 is a diagram showing one picture element 100 of a configuration (3 pixels + 3 pixels) obtained by dividing three pixels of R (red), G (green), and B (blue) into two by two. is there. 4 shows an example in which G (green) is arranged diagonally, and the light emission luminance (luminance 50) when the vertical line L1 and the horizontal line L2 are displayed as shown in FIG. %) Is shown in FIG.

Here, as apparent from FIG. 8, the line width W21 of the vertical line L1 and the horizontal line L
2 is substantially equal to the line width W22. Therefore, when characters are displayed in such a state that the line widths of the vertical line L1 and the horizontal line L2 are substantially equal, an image having a relatively uniform vertical and horizontal character width is displayed as shown in FIG. Characters and graphic displays can be clearly identified.

Next, a third example of this embodiment will be described.

FIG. 9 is a diagram showing one picture element 100 having a configuration (3 pixels × 3 pixels) obtained by dividing R (red), G (green), and B (blue) into three each. 4 shows an example in which G (green) is arranged diagonally, and the light emission luminance (luminance 50) when the vertical line L1 and the horizontal line L2 are displayed as shown in FIG. %) Is shown in FIG.

Here, as apparent from FIG.
The line width W31 of the vertical line L1 and the line width W32 of the horizontal line L2 at a light emission luminance of 50% are substantially equal. Therefore, when characters are displayed in such a state that the line widths of the vertical line L1 and the horizontal line L2 are substantially equal, an image having a relatively uniform vertical and horizontal character width is displayed as shown in FIG. Characters and graphic displays can be clearly identified.

It should be noted that R (red), G (green), and B (blue)
In the case where pixel division is not performed in a picture element composed of pixels, the picture elements are arranged in a matrix such that G (green) is positioned diagonally, so that the display quality in the upper, lower, left and right directions is improved. No difference can be made.

[0032]

As described above, according to the present invention, pixels having high luminance among at least three pixels of red, green and blue constituting a picture element are arranged diagonally so as not to be arranged vertically or horizontally. Thereby, display quality can be improved. In addition, this makes it possible to obtain a clear and identifiable color pixel display and a color graphic display without variation in the light emission luminance distribution and giving no uncomfortable feeling to human eyes.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of a liquid crystal display panel of a color display device according to an embodiment of the present invention.

FIG. 2 is a side sectional view of a main part of the liquid crystal display panel.

FIG. 3 is a diagram showing a configuration of one picture element of the liquid crystal display panel.

FIG. 4 is a diagram showing a screen when one vertical and one horizontal line is displayed by the picture element having the above configuration.

FIG. 5 is a diagram showing a light emission luminance distribution of one vertical line and one horizontal line on the screen.

FIG. 6 is a diagram showing characters displayed by picture elements having the above configuration.

FIG. 7 is a diagram showing a configuration of a picture element according to a second example of the present embodiment.

FIG. 8 is a diagram showing a light emission luminance distribution when one vertical and one horizontal line is displayed by the picture element having the above configuration.

FIG. 9 is a diagram showing a configuration of a picture element according to a third example of the embodiment.

FIG. 10 is a diagram showing a light emission luminance distribution when one vertical and one horizontal line is displayed by the picture element having the above configuration.

FIG. 11 is a diagram showing a configuration of a picture element used in a conventional color display device.

FIG. 12 is a diagram showing a screen when one vertical and one horizontal line is displayed by the picture element having the above configuration.

FIG. 13 is a view showing a character displayed by a picture element having the above configuration.

FIG. 14 is a diagram showing a light emission luminance distribution of one vertical line and one horizontal line on the screen.

[Explanation of symbols]

 Reference Signs List 1 liquid crystal display panel 1a, 1b substrate 2a, 2b electrode 4 liquid crystal 7 color filter 100 picture element G green pixel R red pixel B blue pixel W white pixel

Claims (6)

[Claims] 1. A color display device comprising a display panel for displaying characters and the like in color by a picture element having a plurality of pixels, wherein the picture element has four pixels of red, green, blue and white. And a configuration in which high-brightness pixels of the four pixels are arranged diagonally. 2. The color display device according to claim 1, wherein the high-luminance pixels arranged diagonally are green and white. 3. A color display device comprising a display panel for displaying characters and the like in color by a picture element having a plurality of pixels, wherein said picture element has three pixels of red, green and blue. A color display device, wherein pixels having high luminance among the three pixels are arranged in a matrix so as to be positioned diagonally. 4. A color display device comprising a display panel for displaying characters and the like in color by a picture element having a plurality of pixels, wherein said picture element has three pixels of red, green and blue. A color display device, wherein the three pixels are divided such that high-luminance pixels among the three pixels are positioned diagonally. 5. The color display device according to claim 3, wherein the high-luminance pixels arranged diagonally are green. 6. The display panel according to claim 1, wherein the display panel includes a liquid crystal sandwiched between a pair of substrates, a plurality of electrodes formed on one of the substrates, and a plurality of electrodes on the other of the substrates corresponding to the electrodes. 5. The color display device according to claim 1, comprising a plurality of formed color filters and a counter electrode.