CN1132891A

CN1132891A - Led dot matrix display device

Info

Publication number: CN1132891A
Application number: CN 95118222
Authority: CN
Inventors: 安武正广
Original assignee: Stanley Electric Co Ltd
Current assignee: Stanley Electric Co Ltd
Priority date: 1994-10-24
Filing date: 1995-10-24
Publication date: 1996-10-09
Anticipated expiration: 2015-10-24
Also published as: JPH08123340A; CN1118789C; JP2901506B2

Abstract

According to the invention, a shell 2 is formed with the dimension so as to lead neighboring display units 1 to be closely contacted for heat expansion when the display units 1 get to a highest operation temperature. The side surface of the shell 2 is covered with a cushion coat part 7 for an elastomer of a closing or contacting salient part 8. The closing or contacting salient part 8 integrally forms along two sides of the side surface so as to close a space S formed between the neighboring display units through contacting when the display units 1 get to the lowest operation temperature. The invention solves the problem of damage on a screen surface through the closing of the cushion coat part 7 and the closing salient part 8.

Description

Led dot matrix display device

The present invention relates to a kind of dot matrix display device that uses light emitting diode (LED) as light source, and more specifically, relate to a kind of display device that has be configured to an array of in the unit, forming with the light emitting diode of the expansion that allows screen.

Fig. 2 and 3 shows the structure example as a conventional display unit 90 of an element of a LED dot matrix display device.One single display unit 90 has one to be arranged in the luminous component 90a that 16 row are taken advantage of 16 row with predetermined for example 2.5 millimeters spacing 5 in the shell shown in Fig. 29.This display unit 90 self has 16 lines and takes advantage of 16 Xie Zhedu.

Fig. 3 shows the detailed structure of display unit 90, and in shell 91, it includes a printed circuit board (PCB) 93, a lampshade 94, reaches a light filter 95.This printed circuit board (PCB) 93 is provided to have installs the light emitting diode substrate 92 in a precalculated position in its surface separately.This printed circuit board (PCB) 93 also is provided a wiring figure that has in its surface.Lampshade 94 is made with reflection by each light that penetrates towards the light emitting diode substrate 92 of screen or view finder by for example resin material of white.Light filter 95 is transparent and the counterfeit light to prevent that solar radiation for example from causing of black.

In this case, shell 91 has lampshade 94 such ingredients, even its peripheral size is adjusted and makes also can obtain above-mentioned preset space length P (for example 2.5 millimeters) between the luminous component 91a at adjacent display cell when screen size has been increased because of many display units 90 that are arranged in an array.

For by using above-mentioned display unit 90 to increase the size of screens, these display units are fixed on one by on the metal installing plate 80 for example, and are calibrated to more than row or are calibrated to two or more multirow and row.In this case, as mentioned above, display unit 90 is fixed on the plate of the luminous component 90a that has adjacent display cell 90.These display units are separated from each other (see figure 3) with predetermined spacing.

In the display unit 90 of above-mentioned routine, because the influence of the heat that environment temperature and autoluminescence diode substrate 92 generate, shell 91 (particularly lampshade 94) is supposed to reach the peak value of the temperature that is generally 80 ℃.Under most of operating conditionss, consider the thermal expansivity of resin part that forms lampshade 94 and the metal part that forms installing plate 80, even be formed with a gap S (see figure 3) between the shell 91 to avoid in any interference between adjacent lampshade 94 under the maximum temperature.

As mentioned above, lampshade 94 is made by white resin, is visible by gap S white therefore, and the user is seen the difference that is caused by these white lines on screen.For overcoming this problem, a kind of method that for example by printing or paint the side of lampshade 94 is become black is arranged.Yet, can make the black pigment deliquescing when at high temperature working owing to lampshade 94, this method is not the solution of an essence.When lampshade 94 was expanded owing to temperature, they contacted with each other and the fusion of the pigment on each.When temperature is cooled off, the common lampshade 94 that shrinks of push-and-pull and cause peeling off or the distortion of lampshade of pigment.

In fact, display unit 90 is fixed to makes on the installing plate 80 that not have error between them on distance be absolutely not.For example, if adjacent display unit is fixed with a gap S narrower than particular value, they are adjacent one another are will to cause the problems such as distortion that comprise lampshade 94 before arriving the highest above-mentioned temperature.According to this point, need to consider to be mounted to the precision of actual gap S.And make the gap wideer than particular value, also can cause the problem that obviously worsens as the display unit state.

Specific device as the above-mentioned general issues of solution according to the present invention, provide a led dot matrix display device, include display unit, what each display unit had a shell and a predetermined number arranged in this shell is arranged in the light emitting diode of a dot matrix with a preset space length; An and installing plate, display unit on this plate, be aligned to two or an array of more row and columns do not eliminate this predetermined spacing with the increase that allows screen size, the shell of this display unit has a full-size, under maximum allowable operating temperature (M.A.O.T.), closely to contact owing to thermal expansion makes between the adjacent display unit, this shell has the side surface that is covered by a kind of injection moulding resilient material, this side surface is provided with the sealing lug boss that predetermined both sides are made by the injection moulding resilient material on it, to seal the gap that generates between adjacent display cell by contraction when display unit arrives the minimum operation temperature.

Fig. 1 is the partial sectional view of the display unit part of led dot matrix display device according to an embodiment of the invention;

Fig. 2 is the front view of the display unit of a routine; And

Fig. 3 is the partial sectional view of Fig. 2 A-A along the line.

An illustrated embodiment is described in detail among the present invention in conjunction with the accompanying drawings.In Fig. 1, reference number 1 expression is used for a display unit of led dot matrix display device.The shell 2 of this display unit 1 comprises that one is equipped with the printed circuit board (PCB) 4 of a light emitting diode substrate 3 on it, one lampshade of making by white resin 5, and a light filter 6, and have as in the display unit of routine with a predetermined spacing P and the separated luminous component 1a of adjacent illuminating part.

Display unit 1 is configured to an array of some row and columns to increase the size of total screen as required.Like this, display unit 1 is fixed on the installing plate 10 so that the luminous component 1a of adjacent display unit 1 separates with a predetermined spacing P each other.As the display device of routine, adjacent shell 2 requires at it gap S is arranged each other according to the difference of the thermal expansivity of itself and installing plate 10.

In display unit 1 of the present invention, shell 2 forms with such size basically so that when it reaches maximum allowable operating temperature (M.A.O.T.), because the thermal expansion of shell 2 makes adjacent display unit 1 closely contact to each other.For ease of understanding the present invention, provide a concrete shape: when luminous component 1a is arranged in 16 row when taking advantage of 16 row with the spacing P of 2.5mm between in twos, the size of shell 2 will be 40 * 40mm.

Suppose the thermal expansion of considering installing plate 10 and shell 2 is extended 0.2mm, this is difference between minimum operation temperature (25 ℃) and maximum allowable operating temperature (M.A.O.T.) (80 ℃), and shell 2 has 39.8 sizes of taking advantage of 39.8mm.In other words, between display unit 1, generating the gap S be generally 0.2mm under the minimum operation temperature, and under maximum allowable operating temperature (M.A.O.T.), between the adjacent display unit 1 closely contact is taking place.

In the present invention, according to said structure, the neighboring of lampshade, promptly the side surface of lampshade 5 is coated with for example elastic body of the injection moulding of ameripol.About this respect, lampshade 5 is made by white resin and is had 39.6 sizes of taking advantage of 39.6mm.Then by adopting a proper method of dual injection moulding for example on four side surfaces, to cover with the thick ameripol of 0.1mm with formation bed course part 7, to have the final size of 39.8 * 39.8mm.In this case, the above-mentioned ameripol duskiness look of imaging black of being mixed colours.

And, the orthogonal both sides of the bed course 7 on four sides of shell 2, sealing lug boss 8 is formed the part of the integral male of ameripol.This sealing lug boss 8 extends along the entire length on these both sides, and this lug boss has a height that is enough to touch adjacent display unit under the minimum operation temperature.More specifically, in this was implemented, the height of this lug boss was at least 0.2mm.The dual injection moulding of ameripol is a kind of commonsense method of improving feel when touching camera for example or telescope.

The function and the effect of display unit 1 of the present invention are below described.At first, when (25 ℃) are fixed to display unit 1 on the installing plate 10 when at room temperature, as above illustrated such gap S (0.2mm) that generates.Yet, because the bed course part 7 of duskiness look and from the bed course 7 adjacency of sealing lug boss 8 and the adjacent display cell 1 of projection, makes from the outside and see that lampshade 5 and installing plate 10 are unintelligible, thereby the difference sense is not remarkable.

When light emitting diode substrate 3 is lighted and environment temperature when rising, the shell 2 of display unit 1 expand and gradually subsequently because the ameripol of formation lug boss is deformable and resilient, and this sealing lug boss 8 is out of shape as being driven plain.Between adjacent display unit 1, can not generate undue pressure like this and keep the function of this closing gap S.Bed course part 7 is in contact with one another under maximum allowable operating temperature (M.A.O.T.), does not generate gapped S as initial design.

It more than is description to basic function of the present invention and effect.Yet in practice, not every display unit 1 all is fixed on the installing plate 10 with gap S predetermined between in twos, because the restriction of current possible installation accuracy, and the slight variation of the distance that can not avoid gap S in 0.05mm scope for example.

When gap S was narrower than reference value, the bed course part 7 of adjacent display unit 1 was in contact with one another being lower than under the temperature of maximum allowable operating temperature (M.A.O.T.).When maximum allowable operating temperature (M.A.O.T.), this bed course was partly expanded the distance greater than gap S, but because this bed course part 7 is made by ameripol, can eliminate the height that it surpasses by crimp.Therefore, the present invention can solve because the variation of the gap S that limited precision caused of current possible installation.

As mentioned above, according to the present invention, display unit has shell, and this shell forms has the size that makes tight contact between the adjacent unit when it reaches maximum allowable operating temperature (M.A.O.T.) owing to the result of thermal expansion, and has the display unit that is configured to an array on installing plate.And the side surface of this shell is coated with and has the elastic body that seals lug boss, and this elastic body forms along the both sides of side surface are whole, to be enclosed in the gap that forms between adjacent display element by contact when display unit arrives the minimum operation temperature.The present invention is by the consideration to operating temperature range, seal the gap that for the dot matrix display device that has an array of display cells, is absolutely necessary between the unit by means of elastic body that covers the lampshade side and sealing lug boss, preventing from clearly to see the lampshade and the installing plate of white resin, thereby help the improvement of quality by this gap.

Claims

1, a kind of led dot matrix display device comprises:

Respectively carry a shell and in this shell, be configured to the display unit of light emitting diode of the predetermined quantity of a dot matrix with predetermined spacing; And

One installing plate, described display unit are configured to two or an array of multirow and row more thereon, the size that increases screen to allow to remove predetermined gap.The shell of described display unit has the size of such maximum, so that the result owing to thermal expansion makes closely contact between the adjacent display unit under maximum allowable operating temperature (M.A.O.T.), this shell has the elastomeric side surface of the injection moulding of being coated with, these side surfaces are provided with the sealing lug boss of being made by this injection moulding elastic body along its predetermined both sides, to seal a gap that generates between adjacent display unit by contact when described display unit approaches the minimum operation temperature.