JPH03296793A - Light emitting unit for large-sized display device - Google Patents

Abstract

PURPOSE:To reduce power consumption and to constitute each light emitting unit to be small and inexpensive by making a blue light emitting element a discharge tube and red and green light emitting elements light emitting diodes, respectively. CONSTITUTION:In a light emitting unit for a large-sized display device constituted by combining the red light emitting element DR, the green light emitting element DG and the blue light emitting element FB corresponding to the respective picture elements of a color display device, the blue light emitting element FB thereof is made the discharge tube and the red and the green light emitting elements DR and DG are made the light emitting diodes. Thus, the power consumption is made smaller as a whole than the case that all of the light emitting elements are made the discharge tubes and a cooling means becomes small, so that an area per unit becomes smaller than that of the discharge tube FB even when the plural red and the green light emitting diodes DR and DG are respectively used in one light emitting unit.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention is applied to a large display device that displays color images.

The present invention is particularly suitable for use in large-sized display devices that display color images for television.

The large display device to which the present invention is applied is of a size that can be installed on the wall of a building.

The unit of the invention corresponds to a pixel of a large display device.

〔overview〕

The present invention provides a light-emitting unit for a large-sized display device configured by combining red, blue, and green light-emitting elements, in which the blue light-emitting element is a discharge tube, and the red and green light-emitting elements are each light-emitting diodes. , the power consumption is small, and each light emitting unit can be constructed in a small size and at low cost.

[Conventional technology]

BACKGROUND ART Conventionally, a light emitting unit of a large display device is known in which each of the red, blue, and green light emitting elements uses a discharge tube.

A large display device uses 20,000 or more such light emitting units. On a standard television screen, approximately 8
Ten thousand pieces are required. Among discharge tubes, a fluorescent discharge tube has its filament continuously supplied with a voltage and current of 2V and 75mA, and this power is required regardless of whether light is being emitted. Furthermore, when emitting light, a maximum voltage and current of 21V and 18mA are injected into the anode.

Now, if the number of units in one screen is 20,000, the power consumption of the filament is 2 V x 75 m AX 20.000 = 3 KW, and the power consumption of the anode depends on the brightness of the screen and the number of lights lit for each image. , even if the lighting rate is 10% of the maximum value, 21Vx18mAX20.000x0.1 = 0.75
It is 6 KW. The total power consumption is 3 KWx 3 +0.756 KWx 3ζIIKW since there are 3 light emitting elements in one unit.
It can be seen that the power consumption of the filament is overwhelmingly large.

Therefore, the power consumption of the display device as a whole increases. Furthermore, the fluorescent discharge tube itself has a larger external shape than a light emitting diode, and a cooling space is required between the light emitting units for heat dissipation, resulting in an increase in area per light emitting unit.

[Problem to be solved by the invention]

As a way to improve this, it is conceivable that each of these light emitting elements be a light emitting diode that does not require a filament current. However, while red and green are suitable, blue light emitting diodes are not available. A blue light emitting diode has also been announced, but its unit light emitting capacity is small and it is extremely expensive, so it cannot be designed at a realistic price.

The present invention solves these problems and provides a light emitting unit for a large display device that consumes less power, has a simple cooling means, has a low product cost, and has a small light emitting unit so that the pixel pitch can be reduced. The purpose is to

[Means to solve the problem]

The present invention is characterized in that it utilizes the characteristics of a discharge tube and a light emitting diode.

That is, the present invention provides a light emitting unit for a large display device configured by a combination of a red light emitting element, a green light emitting element, and a blue light emitting element, corresponding to each pixel of the color display device. is a discharge tube, and the red light emitting element and the green light emitting element are light emitting diodes.

It can be a combination of one blue discharge tube, one red light emitting diode, and one green light emitting diode.

1 red light emitting diode and 1 green light emitting diode
It can be implemented in a single light tube.

One blue discharge tube, multiple red light emitting diodes,
It may be a combination of a plurality of green light emitting diodes.

The blue discharge tube may be a fluorescent discharge tube in which a fluorescent material is coated inside the tube and exposes it to the 254mm spectrum of mercury, or it may be a 405mm and 436111fll of mercury.
It is also possible to use the spectrum directly in front of the light source.

[Function] Since the blue light emitting element is a discharge tube, it generates a large amount of light and is inexpensive.

Since the red and green light emitting elements are light emitting diodes, they can be selected to have an appropriate amount of power consumption, a small shape, and an appropriate amount of light generated. And the price is small.

Since these are combined to form a light emitting unit, the overall power consumption is smaller than if all of them were made of discharge tubes. Therefore, the cooling means becomes smaller, so even if a plurality of red and green light emitting diodes are used in one light emitting unit, the area of each unit can be smaller than that of the discharge tube. can.

Furthermore, since no blue light emitting diode is used, the light of each primary color is well balanced and does not become expensive.

In other words, the number of filaments that continuously consume power is reduced to 1/3 compared to conventional products.

〔Example〕

Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram of a first embodiment of the present invention.

FIG. 1(a) is a plan layout view, and FIG. 1(a) is a longitudinal sectional view.

In this figure, a red (R) light emitting element D mounted on a substrate B1 corresponds to each pixel of a color display device.
A light emitting unit is configured by a combination of a green (G) light emitting element DG and a blue (B) light emitting element Fit mounted on the substrate B2.

Here, the present invention is characterized in that the blue light emitting element is one fluorescent discharge tube Fm, and the red and green light emitting elements are each a red light emitting diode D! mounted independently on the light tube M! and 1 each of green light emitting diode DG
The reason is that it is composed of individuals.

In this embodiment, the red and green light emitting elements are light emitting diodes, so there is no need for continuous filament power consumption. Further, as shown in FIG. 1(C), the red and green light emitting diodes Da and Dc mounted in the light tube M have a length excluding their respective leads compared to the blue fluorescent discharge tube F. is small. Therefore, in order to make the surfaces of the respective light emitting parts almost at the same height, a hole H through which the fluorescent discharge tube Fit passes is provided in the substrate B1 on which the leads of the light emitting diode D11Dc are mounted, and the leads of the fluorescent discharge tube Fm are mounted. The substrate B2 is arranged so as to be substantially parallel to the substrate B1. As a result, the distance between the substrate B2 and the substrate B1 can be larger than the distance between the two substrates in the conventional case where all the colors are fluorescent discharge tubes, so that the cooling effect is improved. Therefore, the pitch between each light emitting unit can be reduced.

Generally, in order to maintain white balance, the amount of light from each of the green, red, and blue light emitting elements is emitted at a ratio of approximately 6:3:1.

In this embodiment, there is one each of red and green light-emitting diodes and one blue fluorescent discharge tube, so in order to create a white balance, each of the light-emitting diodes DI %, light-emitting diode D, and fluorescent discharge tube F must be The pulse width (pulse duration) to be added to each is set so that the amount of light is at the above ratio.

FIG. 2 is a diagram of a second embodiment of the present invention, and similarly FIG.
) is a plan layout view, and FIG. 2(c) is a longitudinal sectional view.

In this embodiment, one red light emitting diode D and one green light emitting diode D0 are connected to one light tube M.
This is an example implemented in In this second embodiment, the pitch between each light emitting unit can be made smaller than in the first embodiment.

In order to equalize the amount of light emitted by each color as much as possible using inexpensive light emitting diodes, it is necessary to combine multiple red and green light emitting diodes for one blue fluorescent discharge tube. Configure the unit.

In the third embodiment of the present invention, as shown in the configuration diagram in FIG. A plurality of green light emitting diodes Da are arranged around the fluorescent discharge tube F11, and all of them are covered by a common light tube M. Specifically, as shown in the plan layout of the same embodiment in FIG. 4, the number of light emitting diodes is 3 for red light emitting diodes D, and 6 for green light emitting diodes D. be. Therefore, even when the pulse widths of the respective light emitting elements are made almost the same, the light amount of each color remains at the above ratio, and white balance can be maintained.

In this embodiment, the pitch of the light emitting units is slightly larger than in the first and second embodiments described above, but it is smaller than the pitch in the conventional example.

This is because the amount of power consumed continuously decreases, and the 51st! This is because the distance between the two substrates B1 and 82 can be increased as shown in FIG.

In each of the embodiments described above, each of the two substrates is a square with a side of about 200111 m, and as described above, the two substrates are fixed to each other with spacers at a distance that takes into consideration the cooling effect. Using this as a unit block, a display screen can be assembled.

In the embodiment of the present invention, when calculating the power consumption in comparison with the conventional example described above, each unit has one fluorescent discharge tube,
Even if the power consumption of a light emitting diode is equal to the anode power consumption of a fluorescent discharge tube, 3 KWx 1 +0.756
KW, X 3 =5.2 KW, which is approximately half the power consumption of the conventional example.

〔Effect of the invention〕

As explained above, according to the present invention, the power consumption is small, the cooling structure is simple, the product cost is low, the pixel pitch is small, and the color tone can be made beautiful. This has the effect of promoting the spread of color display devices.

[BRIEF DESCRIPTION OF THE DRAWINGS] FIG. 1 is a diagram showing the configuration of a first embodiment of the present invention.
FIG. 1(a) is a plan layout view, and FIG. 1(b) is a longitudinal sectional view. FIG. 2 is a diagram showing the configuration of a second embodiment of the present invention.
FIG. 2(a) is a plan layout view, and FIG. 2(b) is a longitudinal sectional view. FIG. 3 is a cutaway view showing the configuration of a third embodiment of the present invention. FIG. 4 is a plan layout diagram of the same embodiment. FIG. 5 is a longitudinal sectional view of the same embodiment. Bt SB2...Substrate, DG...Green light emitting diode, Di...Red light emitting diode, Fit...
Blue fluorescent discharge tube, H...hole provided in the substrate B1 through which the fluorescent discharge tube passes, M...light tube, P...signal line.

Claims (1)

[Claims] 1. Corresponding to each pixel of a color display device, a red (R) light emitting element, a green (G) light emitting element, and a blue (
B) In the light emitting unit of a large display device configured by a combination of light emitting elements, the blue light emitting element is a discharge tube, and the red light emitting element and the green light emitting element are light emitting diodes. Light-emitting unit of display device. 2. The light emitting unit for a large display device according to claim 1, comprising a combination of one each of a blue discharge tube, one red light emitting diode, and one green light emitting diode. 3. The light emitting unit for a large display device according to claim 2, wherein the red light emitting diode and the green light emitting diode are mounted in one light tube. 4.Claim 1 in which one blue discharge tube, multiple red light emitting diodes, and multiple green light emitting diodes are combined.
A light emitting unit of the described large display device.