JPS62268043A - Display unit - Google Patents

Abstract

PURPOSE:To aim at reduction in a scanning line moire and a signal moire, by setting the number of display dots situated on a one array line in a scanning direction or a vertical direction on a screen to the same number of less than the number of display dots to be situated on one array line in other directions. CONSTITUTION:Signs of m1-m18 and straight lines A0, A1... and B0, B1... showing phosphor dots 9 are marked with disposition of these phosphor dots in and around the center point of a screen 3. For example, taking a dot m10 into account as the center, each of array lines B0-B4 is tilted as much as theta 10 deg. to a Y-axis, and likewise each of array lines A0-A6 is formed into an array pattern tilted as much as theta 10 deg. to an X-axis. And, when this array pattern is rotated as far as about 10 deg. to both X-and Y-axes, straight strength can be weakened to 3 from 11 at on the Y-axis and the straight strength on the X-axis from 5 to 3, respectively. With this constitution, occurrence of a signal moire and a scanning line moire both is reduced.

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a display device in which a large number of small display points are arranged in a fixed pattern on a display surface, such as a color cathode ray tube or a gas discharge display device. The present invention relates to display devices.

[Conventional technology] The following description will be made using a color cathode ray tube as an example.

Figure 3 is a partially cutaway side view showing the schematic structure of a color cathode ray tube (hereinafter abbreviated as [cRTJ). A panel (2) equipped with a fluorescent screen (hereinafter referred to as "display surface") (3) on which fluorescent dots are arranged in a certain pattern, a funnel-shaped funnel part (4), and an in-line electron gun. (6) and a neck part (5) containing the neck part (6). Inside the envelope (1), a shadow mask (7) is suspended via a bottle (not shown) provided on the skirt of the panel (2), facing the display surface (3). .

Figure 4 shows the front view of a CRT for explaining the relationship between a crater hole type shadow mask (7) with round holes and the arrangement pattern of phosphor dots (9) on the display surface (3). In the figures, A is a partially enlarged view of the display surface (3), and B is a partially enlarged view of the shadow mask (7). The long sleeves, that is, the arrangement direction of the electron guns (6) passing through the center point 0 of the display surface (3) are shown as the X axis, and the short axis passing through the center point 0 perpendicular to the X axis is shown as the Y axis.

Also, the in-line electron gun (6) is from the left of the figure (6B)
They are arranged in the following order: (for blue), (6G) (for line), and (6R) (for red).

In the figure, the display surface (3) has three colors of blue, as shown in the enlarged view A, corresponding to one electron beam passage hole (8) of the shadow mask (7) shown in the enlarged view B. Green and red round phosphor dots (9) are burned into it.

Therefore, on the entire surface of the display surface (3), three colored phosphor dots (9) are arranged in a mosaic pattern.
When looking only at the phosphor dots (9) of a color, for example red, the pattern is the same as that shown in enlarged view B, and the same is true for the phosphor dots (9) of other colors. For this reason, the fluorescent light (1/2 dots (9)) is configured in an array pattern in which equilateral triangles are stacked in the major axis direction and the minor axis direction.

A CRT constructed in this way uses an electron beam to illuminate the display surface (
3) Long 'f'i! The phosphor dots (9
) constitutes a display device that displays images by emitting light.

[Problems to be solved by the invention] In recent display devices, the resolution has progressed to higher resolution, and the display projected on the CRT display screen has also changed to a higher density one, so the scanning line of the electron beam and The moiré phenomenon caused by optical interference with the arrangement of the phosphor dots (9) has become a problem. .

It is generally well known that this moiré phenomenon occurs as a striped pattern of shading between two or more types of straight lines. The main moire was caused by optical interference with the array of phosphor dots (9), and colored moire was caused by vertical striped signals.

Figure 5 shows the phosphor dots (9) near the center of the display surface (3).
) is a partially enlarged front view showing the arrangement of m1 to m18 in the figure.
respectively indicate phosphor dots (9), and A o'''-A
6 and Bo to B4 are array lines 3 connecting phosphor dots located on lines parallel to the X axis and Y axis, respectively.
In the figure, the line A4 connecting mB m10 m17 corresponds to the X axis of the display surface (3), and mB - mB - mlQ
-mll corresponds to the Y axis of the display surface (3), and mlO corresponds to the center point O of the display surface (3).

Now, if we consider mlO as the center, mB and m18 form an equilateral triangle, and mlOmla m14 also forms an equilateral triangle. In this way, the arrangement pattern of the phosphor dots (9) shown in FIG. 5 is composed of stacked equilateral triangles.

Next, looking at the arrangement of the phosphor dots (9) centered on mlQ, we see that the Y-axis direction connecting mll mlo mB-mB and m4-m? ”-mlO-m18-
A direction of 60 degrees to the Y axis connecting m16 and m2-m
6-ml.

There are three directions, one at 160 degrees with respect to the Y axis connecting m14 and m18.

Next, considering the arrangement in the X-axis direction, ml −rrH3
- Line connecting m15 AQ1m5 Line connecting m12 A1,
On the line A2 connecting m2m9m16, each line macroscopically appears to have a linear structure parallel to the X axis.

The spacing between these array lines AQ, Al,...
Optical interference with the beam spacing during scanning of the electron beam is one of the causes of moiré, which has been a common problem in the past.

Another cause of moiré is a vertical stripe signal.

To explain this with reference to FIGS. 5 to 7, a column of ml-m2-m3-m4 on an array line Bo parallel to the Y axis, a column of m5-m6-m7 on an array line Bl, and so on, Array line B
The problem is optical interference between the linear structure of the columns 2, Bs, B4, etc. and the pitch of the vertical stripe signal.

FIG. 6 shows the arrangement of the phosphor dot pattern on the display surface (3). Assume that a signal α0 of vertical stripes with a width W is displayed on this display surface (3). At this time, when considering the X-axis section of the display surface (3), the light emission state of the phosphor dots (9) has a distribution as shown in FIG. In this way, the light output is a continuous light emitting point, but since the human eye perceives it macroscopically, it cannot be seen intermittently. In other words, the phosphor dots (9) form the display surface (3) at a small pitch so as to be able to withstand the degree of eye disintegration.

Here, there are two problems regarding moiré.

One is the dimension b in FIG. 7, which is the dot pitch of the component in the X-axis direction, and causes moire similar to the above-mentioned scanning line. Another problem is coloring at the edge of the electron beam. In other words, when three electron beams (red, blue, and green) strike the same position on the display surface (3), all three colors emit light inside the electron beams (in the center). Although it appears white, at the end of the electron beam, the pitches of a and C in Figure 7 are in the relationship a) b, b\C, and the position of the phosphor dot (9) is determined by the color of the phosphor. Due to the difference in the luminescence intensity, the color balance is disrupted, resulting in a colored appearance.

The present invention has been made to solve these problems, and it is an object of the present invention to provide a display device in which the phenomena of scanning line moire and signal moire caused by the arrangement pattern of phosphor dots are reduced.

[Means for Solving the Problems] The display device according to the present invention arranges display points on a display surface in a scanning direction or on a single array line in a direction perpendicular to the scanning direction. The number of points is
Display points are arranged so that the number of display points is equal to or less than the number of display points located on one arrangement line in other directions.

[Effect]

In this invention, the number of display points located on the scanning line or the line perpendicular to the scanning line is the same as or less than the number of display points located on the array line in other directions. As a result, the linear pattern of the image displayed by the scanning lines can be further weakened, and the occurrence of moiré and coloring at the ends of the display lines can be reduced.

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

FIG. 1 is an enlarged view showing the arrangement of the phosphor dots (9) near the center of the display screen (3) of an embodiment of the present invention, and the phosphor dots (9) are shown in correspondence with FIG. ml-m18 and straight lines connecting them Ao, Al, A2. . . . and BO, J, B2 + . . . are labeled.

This embodiment is different from the conventional example shown in FIG. 5, for example, when considering m1G, each array line Bo
-84 are each tilted by 10' for each θ with respect to the Y axis, and similarly, each array line AQ to A6 is formed in an array pattern that is tilted by θ lO0 with respect to the X axis.

The operation of this embodiment will be explained below.

Figure 8 shows how the ``linear structure'' that occurs because the phosphor dots (9) have a certain pattern takes into consideration the small area A in the center of the conventional display screen (3) in Figure 5. This explains how things are going.

Here, the term "linear structure" refers to the number of phosphor dots (9) on one straight line when considering a certain small area, and the intensity of the "linear structure" is less than or equal to c, 1 – linear strength”. ) can be expressed.

That is, there are 11 phosphor dots on the Y-axis, including 5 dots in the + direction of the Y-axis and 5 dots in one direction, including mio in the center.

Furthermore, there are five on the X axis. Considering this, the 8th
The facet '[A of the figure includes mlO as shown in the figure,
There are 16 "linear structures" connecting three or more phosphor dots from ρ0 on the Y axis to ρ15 on the X axis. Among these, ρ10 is a line at −=60° from the Y axis, and its “fix! strength” is 11, the same as ρ0.

Figure 9 shows the 16 “linear strengths” explained above on the vertical axis.
"Straight line structure"ρO'=P The angle - from the Y axis of P15 is taken as the horizontal axis, and the first . In the figure shown for the third quadrant, for example, the "linear intensity" of ρ0 is an intensity of 11 because the number of phosphor dots is 11,
Since there are three "linear intensities" of ρ1 including the center, they are shown as three intensities. In addition, in this figure, 1- indicates the case of a small area in the first quadrant, and the display surface (
3) The same is true even if it is expanded over the entire surface.
This is a "linear structure" in which ρO is related to signal moiré, and ρ16 is related to scanning line moiré.

The moiré phenomenon occurs conspicuously when two straight lines with different pitches are parallel to each other and have a specific relationship. That is, for example, if the spacing (pitch) of the scanning lines is Mmm, the array lines AO to A6 of the phosphor dots (9) + BO' = B
If the interval (pitch) of 4 is Nmm, then M/N=m
/n (m and n are positive integers), experimentally results were obtained in which it was better to avoid m and n from being in the range of 1 to 4, respectively.

In other words, (1) The smaller the pitch of the interference fringes formed by the pitches of M and N, the better.

(2) Even if the pitch of the interference fringes is the same, it is better to have a smaller difference in shading.

These two points are requirements for solving the moiré problem. Therefore, as in this example, the phosphor dots (9)
When the array pattern of is rotated by about 10 degrees with respect to the Y-axis and the Y-axis, the "linear strength" changes from 11 to 3 on the Y-axis.
The "linear strength" on the X-axis can also be weakened from 5 to 3. Therefore, the occurrence of both signal moire and scanning line moire can be reduced.

The reason why signal moire and color unevenness can be reduced will be explained in detail below.

FIG. 2 is a distribution characteristic diagram of the optical output in the X-axis direction when the 'a vertical stripe signal is projected according to this embodiment.
The figure shows the integrated output light over a sufficiently long range in the axial direction. As can be seen from this characteristic diagram, by tilting the array line B2 by about 10 degrees with respect to the Y axis, a trapezoidal distribution different from the output light distribution shown in the seventh factor is created, so the "linear intensity" is weakened, and the signal The occurrence of moire and color unevenness at the edges can be reduced.

In the above embodiment, a display device using a CRT was explained as an example, but like a plasma display device using gas discharge, small display points are arranged on the display surface in a fixed pattern, and the display surface is long. A similar effect can be obtained by applying the present invention to a display device configured to display an image by scanning in the 4111 direction and short axis direction and causing each display point to emit light.

In addition, in the above embodiment, the arrangement pattern of the display points was configured to be rotated by the same angle with respect to the major axis and the minor axis over the entire display surface, but it is possible to The arrangement pattern may be limited to an easy-to-use surface area, or may be an array pattern tilted only in the major axis direction or the minor axis direction.

[Effects of the Invention] The present invention includes a display surface on which a large number of display points are arranged, and is configured to sequentially or interlacedly scan the display surface to display an image at the display points. In the display device, the arrangement pattern of the display points is
The number of display points located on one array line in the scanning direction or the direction perpendicular to the scanning direction is the same as the number of display points located on one array line in the other direction, or Th. Since the array pattern has a V pattern, it is possible to reduce the occurrence of scanning line moiré or signal moiré.

[Brief explanation of drawings]

Fig. 1 is a front view of a display screen showing the arrangement pattern of phosphor dots in an embodiment of the present invention, and Fig. 2 shows the distribution on the X-axis of the optical output of Kr stripes displayed on the Y-axis. Characteristics diagram, Fig. 3 is a partially cutaway side view showing the configuration of the shadow mask color pole ray tube, Fig. 4 is a front view showing the arrangement pattern of phosphor dots on the display screen, and Fig. 5 is the same display screen. Fig. 6 is a partially enlarged front view showing the arrangement pattern of the phosphor dots, Fig. 6 is a partially enlarged front view showing the relationship between the phosphor dots and the vertical χ5 signal, and Fig. 7 is a diagram showing the output light distribution of the vertical stripe signal. , FIG. 8 is a diagram showing the distribution of array lines of phosphor dots on the display screen, and FIG.
The figure shows the relationship between the number of phosphor dots on the array line and the angle of the array line with respect to the Y axis. (3) Display screen, (9), (town) ~ (m I B
)...phosphor dot (display point), A, ~A6, B
Q-B4--array line, 0-center point of display surface, X...
Long axis of the display surface (scanning direction), Y: short axis of the display surface (direction perpendicular to the scanning direction), θ: intersection angle. Note that in each figure, the same reference numerals indicate the same parts.

Claims (2)

[Claims] (1) In a display device that is equipped with a display surface on which a large number of display points are arranged, and is configured to sequentially or interlacedly scan the display surface to display an image at the display points, The number of display points located on one array line in the scanning direction or the direction perpendicular to the scanning direction is the number of display points located on one array line in the other direction. A display device characterized by forming an arrangement pattern of display points so that the number of display points is the same or smaller. (2) The display device according to claim 1, wherein the rotation angle of the arrangement pattern of the light emitting points is about 10 degrees.