JPS6370283A - Display of surface irradiation led unit - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Summary] The present invention has LED elements mounted at a high density and configured into a main group and an auxiliary group, and when the main group is turned on, the auxiliary group is selectively turned on and a predetermined lighting is performed. This is a display method for surface-illuminated LED units that adjusts the brightness of the LED unit.This method allows for uniform brightness and no difference between colors (and allows for uniform LED units to be obtained, as well as for the selective use of LED elements. This eliminates the need for replacement, rearrangement, etc. even when they are arranged adjacent to each other, and contributes to improving the quality of the device.

[Industrial application field]

The present invention relates to a display device such as a supervisory control device, and relates to a display method of a surface-illuminated LED unit that eliminates variations in brightness by mounting a plurality of LED elements and illuminating the surface of the LED unit.

The display devices used in modern monitoring and control equipment range from traditional light bulbs to LEDs, liquid crystals, plasma, CRTs, and more.
There have been remarkable developments such as those that use laser beams,
It has become diverse.

In particular, graph ink displays have become extremely versatile, and have come to be able to display not only still images but also moving images, as well as displaying multiple screens interchangeably, which was impossible to achieve in the past.

On the other hand, illumination is also changing from a spot to a surface, increasing the area, increasing the number of colors, and directly showing only the displayed content (figures and characters).
There is a trend toward direct display, and these have been skillfully combined to provide illumination that is easier to see.

[Conventional technology]

For this illumination, instead of light bulbs, LEDs are becoming dominant because they are ultra-compact, long-life, low-power, and can emit light in several colors.

The luminous intensity has also been increased, and many single-element devices used as indicator lights are already on the market.

However, for devices that provide large surface illumination, a unit area is set and multiple elements are mounted to uniformly illuminate the LED unit. I'm trying to get the illuminated area.

As a conventional example, an LED unit that illuminates a unit area of 30 x 30 mm will be described.

FIG. 4(a) is a front view of an example of a conventional LED unit.
The same figure (b) shows the same side sectional view, and the same figure (C) shows the same circuit diagram.

The LED unit has an LED inside a synthetic resin case 5.
Eight elements 11 are connected in series as shown in the circuit diagram,
Furthermore, a resistor 12 for current limiting is connected and the mounted LED is
A module 1, a light scattering filter 2, and a display plate 3 are stored in this order, and a transparent synthetic resin cap 4 is fitted and fixed from the front. Terminals 13 for connection wiring are passed through and drawn out.

Normally, in order to uniformly illuminate the entire surface, it is necessary to arrange the LED elements densely over the entire surface, but by using the filter 2 that scatters light, it is possible to arrange the LED elements at some distance. , scattered and softened by filter 2,
The emitted light appears to emit light evenly over the entire surface.

As a result, the eight LED elements 11 are arranged in a staggered manner at the center of a square that divides the illumination surface into 16 equal parts, as shown in the front view, and when viewed from the surface of the cap 4 when lit, they appear uniform. It provides brightness and can be used as surface illumination.

Furthermore, there is also an LED unit in which an LED module having the same external shape and eight LED elements of other light emitting colors are arranged in staggered empty positions to display a multi-color display.

[Problem that the invention seeks to solve]

however, (The luminous intensity of the IILED element 11 varies greatly.

For this reason, eight selected LEDs are used in the LED module 1, but there is always a difference in brightness between the LED units.

(2) There is a difference in luminous intensity between the LED elements 11 of different colors.

For example, there are differences in luminous intensity depending on red, yellow, green, etc.

(3) When LED units are arranged adjacent to each other, it is necessary to replace or rearrange the LED units or change the resistor 12 to adjust the current in order to reduce the difference in brightness.

There are frontage points such as

[Means for solving problems]

The above problem is solved by mounting LED elements 11 in high density corresponding to the illumination surface as shown in Fig. 1.
Consisting of a plurality of LED elements 11 arranged approximately evenly,
LEDs configured into main group 70, auxiliary group 71...
The LED unit includes a module 8, a means for selectively lighting the auxiliary group 71, and a light scattering filter 2, and in order to obtain a predetermined brightness, in addition to the main group 70,
This problem is solved by the display method of the surface-illuminated LED unit of the present invention, in which the auxiliary groups 71 are selectively turned on and illuminated through the filter 2.

[For production]

That is, variations in the brightness of the illumination surface due to the lighting of only the main group 70 can be suppressed by selectively additionally lighting the auxiliary groups 71 .

The LED elements 11 have become extremely small, the luminous intensity has increased, and it has become possible to obtain highly efficient LED elements, and the mounting interval has also been reduced to 3.
It can be made up to 11m or less.

Therefore, it is easy to increase the mounting density of the LED elements 11 several times even in the case of an LED unit for same-plane illumination.

As a result, corresponding to the illumination surface, the
A plurality of groups of LED elements 11 can be configured by group.

One of these groups is designated as the main group 70, and is always lit.
If the D unit does not reach a predetermined brightness, the remaining other groups 71... can be selected and additionally lit to adjust the brightness and suppress variations in the LED units.

In addition, even in multi-color display LED units, multiple groups are configured for each color, including differences in brightness for each color.
It can be suppressed.

As described above, variations in the brightness of the LED units and differences in brightness depending on the color of the LED units for multi-color display can be suppressed, and there is no problem even if the LED units are arranged adjacent to each other.

In addition, it is possible to compensate for the deterioration of brightness due to aging during use, contributing to higher reliability and longer life of the LED unit.

〔Example〕

The present invention will be specifically described below with reference to embodiments shown in the drawings.

The same reference numerals indicate the same objects throughout the figures.

FIG. 1(a) is a side sectional view of the LED unit of the first embodiment of the present invention, FIG. 1(b) is a back view of the same, and FIG.
The layout diagram of the D element, the same figure ((1) is the same circuit diagram, Figure 2 is the layout diagram of the LED element of the second embodiment of the present invention, Figure 3 (a)
2 shows a block configuration diagram of a third embodiment of the present invention, and FIG. 3(b) shows a circuit diagram of the same.

The first embodiment is a 30 x 30 ml surface-illuminated LED unit, which is the same as the conventional example described above, and was designed with compatibility in mind.The LED elements 11 are mounted four times more densely,
A total of 32 elements are arranged in 8 groups x 4 groups.

In a synthetic resin case 6, as shown in the circuit diagram, 32 LED elements 11 are connected in series with 8 LED elements and a current limiting resistor I2, forming a total of 4 groups. (Main group 70
and auxiliary group? 1, 72, 73), an LED module 8, a light scattering filter 2, and a display plate 3 are stored in this order, and from the front, a transparent synthetic resin cap 4 is placed. are fitted and fixed, and the rear surface of the case 6 has terminals 13 for connection wiring and an auxiliary group 7.
A group terminal 81 serving as selective lighting means for auxiliary groups 71, .

Even if the light sources are spaced apart, a filter 2 that scatters the light is used to uniformly illuminate the entire surface.
As a result, the arrangement of the LED elements 11 is as shown in the arrangement diagram.
In the center of the square that divided the illumination surface into 64 equal parts, the 8 units marked 0 in the figure, which are arranged in a staggered manner at intervals of 3, constitute the main group 10, the auxiliary group 71 in the same figure, the auxiliary group 72 in the same figure, A total of four groups, including the auxiliary group 73, are constructed in the same manner, and each group is arranged approximately equally with respect to the illumination surface,
Regardless of which group is lit, uniform brightness is obtained from the surface of the cap 40, and the brightness is proportional to the number of groups lit at the same time.

The main group 70 is always lit during surface illumination, and the other auxiliary groups 71...73 serve as auxiliary LED units.
The shorting plug 82 is selectively set and used to compensate for variations in brightness of the LED units.

This eliminates the difference in brightness between the LED units, eliminates the need for replacement or rearrangement when they are arranged adjacent to each other, and improves the quality of the device.

The second embodiment is a multi-color display LED unit having the same external shape and structure as the first embodiment.

As shown in the arrangement diagram of the LED elements in FIG. 2, LED elements of different colors are mounted in the non-mounted positions of the arrangement of the first embodiment, and a total of 64 LED elements are mounted.

In the figure, a group is made up of eight items marked ■, and a group is made up of the same ■, and similarly, ■
〜■ are divided into groups, making a total of 8 groups, and 〜■
The group ■ and the groups ■ to ■ are separated by color, and the groups ■ and ■ are used as the main group, and the other groups are selectively used as auxiliary groups.

In each group, eight LED elements are arranged approximately evenly on the illumination surface, and no matter which group is lit, the brightness is uniform from the surface of the camp, and it is easy to select the auxiliary group. By lighting, it is possible to obtain a surface-illuminated LED unit with uniform brightness without any color difference.

The third embodiment is a multi-color display similar to the second embodiment, but the brightness is further finely adjusted.
This is a method of displaying the D unit.

Sixty-four LED elements are evenly arranged corresponding to the illumination surface, and four adjacent LED elements are arranged as shown in the block diagram of FIG.
8 blocks a1...a8 are taken out in a staggered manner at l-block intervals, and the remaining 8 blocks are taken out in a staggered manner.
The blocks b1...b8 are separated by color, and one specific LED element in each block constitutes a main group, and the remaining three elements in the block constitute one auxiliary group.

One plate was taken out from each block and composed.
A total of two main groups Δ, B and a total of 16 auxiliary groups a1...a8 . for each block. As shown in the circuit diagram of FIG. 3(b), each main group A, B is divided into groups bl...b8, and as shown in the circuit diagram of FIG.
Eight LED elements are connected in series and connected to a drive circuit 91 for lighting, and each auxiliary group a1...a8 . bl...
- b8 is connected to a drive circuit 91 for each LED element, and the drive circuit 91 is controlled by a control circuit 92 that receives lighting information from the outside. The control circuit 92 further controls the drive circuit 91 by specifying the auxiliary group and the LED elements therein to be additionally lit by the memory circuit 93 . The memory circuit 93 uses a rewritable memory, and the memory is set in advance.

In an LED unit like this, each OL of each auxiliary group
By selectively lighting the E'D elements, fine adjustments can be made for each portion of the illumination plane divided into approximately eight equal parts.

This makes it possible to implement the LED elements without having to selectively use the luminous intensity of the LED elements. In other words, when the main group is turned on, in addition to variations in brightness across the illumination surface, local variations also occur within the surface, but these are all caused by
Compensation can be made by fine adjustment by selectively lighting each LED element in each auxiliary group.

In addition, rewritable memory circuit 9
3 and there will be no problem.

Furthermore, as an application, in addition to making the illumination surface uniform in brightness, it is also possible to make the brightness slope or partially vary the brightness within the surface. If this is added to the lighting information from the outside, further diversity can be added to the surface illumination.

As a result of the above, the brightness is uniform and there is no difference between colors.
A uniform surface-illuminated LED unit can be obtained.

In the above example, the display method of a surface-illuminated LED unit with an illumination area of 30 x 30 + tm was illustrated, but the size of the illumination area, the mounting density of LED elements, the number of units in a group, the number of groups, the method of configuring the group, and the display The number of colors, structure, etc. are shown in the diagram.
．． It is not fixed.

〔Effect of the invention〕

As described above, according to the present invention, it is possible to obtain a uniform surface-illuminated LED unit with a brightness of 11 mm and no difference depending on the color, and also to reduce the selection and use of LED elements, even when arranged adjacently. This eliminates the need for replacement, rearrangement, etc., and contributes to improving the quality of the device, which is highly effective.

[Brief explanation of the drawing]

Fig. 1 is an LED unit according to a first embodiment of the present invention, Fig. 2 is a layout diagram of an LED element according to a second embodiment of the present invention, Fig. 3 is a third embodiment of the present invention, and Fig. 4 is a conventional one. An example of an LED unit is shown. In the figure: (a) Imi・1dhltlJb Shigeko
(1)) End view Conventional cut-Ij LED Uni-Soto TA-7

Claims (1)

[Claims] A main group (70) consisting of a plurality of LED elements (11) that are densely mounted and arranged substantially evenly in correspondence with the illumination surface. , an auxiliary group (71...), a means for selectively lighting the auxiliary group (71...), and a light scattering filter (2). A surface-illuminated LED unit characterized in that, in addition to the main group (70), the auxiliary group (71...) is selectively turned on to emit light through the filter (2). How to display.