JPH02181781A - Display element - Google Patents

Abstract

PURPOSE:To reduce the number of manufacturing processes and to facilitate the manufacture by providing a colored condenser lens for respectively condensing light beams from the respective image elements of red, green and blue colors on a light emitting surface. CONSTITUTION:The colored condenser lens 16 is made to be bonded on the light emitting surface of a light emitting element 10 where respective red, green and blue image elements 11-13 are formed with a transparent adhesive layer 17. It is good for the condenser lens 16 to be uniformly colored so that the lens 16 may have the characteristic of a transmittivity uniform to a transmitted light beam, or it is good for the condenser lens 16 to be uniformly colored so that the red, green and blue light beams may be selectively transmitted, furthermore, even if the condenser lens 16 is respectively colored with other colors at every place corresponding to respective image elements 11-13 so that respective colored light beams emitted from respective image elements 11-13 may be selectively transmitted, the contrast between the state of all light emission and the state of non light emission increases, and by coloring the condenser lens 16 and making the lens have a filter characteristic, the number of the manufacturing processes can be reduced and also the manufacture can be facilitated.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a display element forming a display screen of a large-sized display device, and particularly to a color display element capable of displaying clear luminescence.

[Conventional technology]

As a conventional display element of this type, for example,
There is a display element disclosed in Japanese Patent No. 157663.

FIG. 3 is a schematic perspective view showing the whole of this type of conventional display element, and FIG. 4 is an exploded perspective view showing the whole in an exploded manner. In these figures, the display element is one light emitting element (red, green, and blue pixels UU, □□□ on 1G).

By controlling the light emission of each pixel CIIJ (11 ]J, a, (each red, green, and blue filter η, (2), printed corresponding to 13),
The slope of each red, green, and blue pixel Ql,l, (1, (13
The light emitted by each passes through the red, green, and blue filters to filter out light in bands other than the corresponding color. υ, @
, ■ It is a configuration that absorbs water. Note that the letters R, G, and B in the figure represent red, green, and blue pixels or filters, respectively. In this display element, the red light emitted from the red pixel 0η is selectively transmitted through the red filter and emitted to the outside. Similarly, each color light emitted by the green pixel (b) and the blue pixel (2) is also sent to the green and blue filters, respectively.

(to) is selectively transmitted and emitted to the outside.

Next, each red, green, and blue pixel (b), a'e,
(Light incident on the surface of 11, for example sunlight, enters into each of the - degree red, green, and blue filters @), @, ■, where the transmission of each filter @1), @, H. It is absorbed according to its characteristics and reaches the surface of each pixel Q3. Furthermore, the sunlight arriving from the outside is further reflected on the surface of each pixel east, (2), al, and each filter filter υ.

(1), passes through @, and returns to each filter (c), g2.
It is absorbed according to the transmission characteristics of C10 and emitted to the outside.

That is, in this display element, each of the red, green, and blue filters? υ,■,c! 1 is each red, green, and blue pixel Qυ.

a, (The light emitted at a ratio of 1:1 is selectively transmitted, but most of the external light that enters the surface of each pixel CU, (b), 03 from the outside, is reflected, and is emitted to the outside. This increases the contrast between the fully emitted state and the non-emissive state of each pixel Cl1), (12, 03).

However, in this display element, each pixel o1), (6), aa
When the light emitted from the filters passes through the filters υ, @, and -, the intensity decreases to some extent, which has the disadvantage that the luminance of the light emitted as a single display element decreases.

Therefore, in order to improve the above-mentioned drawbacks, a display element as shown in the patent specification (1-Display element) dated December 19th by the same applicant was proposed.

FIG. 5 is a cross-sectional configuration diagram showing a conventional display element according to such prior art.

In this figure, each color light emitted by each pixel of red, green, and blue passes through a filter and is focused by a condensing lens () to increase the intensity of light in the front direction of the display element. , inject to the outside. Therefore, in this display element, the filter (1) works to increase the contrast between the full light emitting state and the non-light emitting state of each pixel, and the condensing lens (1) works to increase the contrast between each pixel's full light emitting state and non-emitting state, and the condensing lens (1) works to increase the contrast between each pixel's full light emitting state and non-emitting state. The reduction in intensity that occurs when the light passes through each filter (1) is compensated for, and the luminance of light emission is also increased.

[Problem to be solved by the invention]

Conventional display elements are implanted as described above and can display images with high brightness and high contrast. In order to achieve this, it is necessary to treat the back side of the lens, create an intermediate layer (7) with an undercoat agent between the light emitting element surface, the filter, and the lens, and silane coupling treatment, which requires the use of a variety of materials and the manufacturing process. Since the number of layers is large, manufacturing costs are high, and quality requirements are high in order to maintain adhesion between layers made of different materials, making manufacturing difficult.

This invention was made to solve the above-mentioned problems, and by coloring the condensing lens to give it filter characteristics and eliminating the need for a filter that was conventionally provided in display elements, it is easy to manufacture. To provide a low-cost, high-quality display element.

[Means to solve the problem]

The display element according to the present invention is provided with a colored condensing lens that condenses light from each pixel on the light emitting surface of one light emitting element in which red, green, and blue pixels are formed. As a condensing lens, it may be uniformly colored so as to have uniform transmission characteristics for the transmitted light,
Further, it may be uniformly colored so as to selectively transmit red, green, and blue light. Further, each location corresponding to each pixel may be colored in a different color so that each color light emitted from each pixel is selectively transmitted.

[Effect]

The display element of the present invention is equipped with a colored condensing lens on the light emitting surface of the light emitting element, so that it can display images with high brightness and high contrast without the need for a filter that conventional display elements have. A high-quality display element can be easily realized at low cost. As a colored condensing lens,
If you use a material that is uniformly colored so that it has uniform transmission characteristics for the light that passes through it, the intensity of the light from each pixel will be weakened by one degree when it passes through the condensing lens. , external light is weakened twice, once when it is incident and when it is reflected, increasing the contrast between full light emission and non-light emission states.

If you use a condensing lens that is uniformly colored so that it selectively transmits red, green, and blue light, the condenser lens will transmit light from each pixel well, but most of the external light will be 2 degrees. This increases the contrast between full emission and non-emission states.

Furthermore, the contrast can be increased similarly to the example described above, even if the condenser lens is colored in a different color for each location corresponding to each pixel so that light emitted from each pixel is selectively transmitted.

〔Example〕

Hereinafter, a display element according to an embodiment of the present invention will be explained with reference to the drawings. FIGS. 1 and 2 are a front view and a cross-sectional view, respectively, showing a display element according to an embodiment of the present invention.

In these figures, the display element has red, green, and blue pixels aJ403 integrally formed on one light emitting element aQ, and a target color is produced by controlling the light emission of each pixel 9υ, 4, and 4. indicate. Note that a colored condensing lens αQ is provided on the light emitting surface of the light emitting element QG, and the condensing lens Ql and the light emitting element αQ are bonded together with a transparent adhesive layer αη. The condenser lens aCt does not have selective transmission characteristics, and is made of glass or plastic that is uniformly colored achromatic gray with dyes or pigments so that the transmittance decreases overall in the entire visible light range. There is. For example, for glass, cadmium sulfide, cadmium selenide, iron oxide, chromium oxide, etc. may be mixed, and for plastic, anthraquinone head, phthalocyanine pigment, etc. may be mixed. The transparent adhesive layer αη is attached to each pixel aυ
, (b), (so that the light emitted in step 3 is sufficiently transmitted,
It is made of silicone-based, acrylic-based, epoxy-based, or polyester-based transparent adhesive, and the light emitting element (11
and the condenser lens CO, and the light emitting element Q
By sealing the space between Q and the condenser lens QQ, dirt and dust, especially when this display element is used outdoors, rainwater and mud can enter the space between the light emitting element α and the light emitting element α.
This prevents the light emitting surface of Q from getting dirty and reducing the amount of light emitted. In addition, by using a transparent adhesive that is soft after solidification, if the condensing lens QQ is deformed due to thermal stress etc. after adhesion, the deformation is absorbed by the transparent adhesive layer αη, and the condensing lens This prevents the lens α from peeling off due to the light emitting element.

Next, based on the above configuration (the operation of the above embodiment will be explained based on FIG. In the figure, each colored light emitted at (b) 03) passes through the transparent adhesive layer opening, and is emitted to the outside with the intensity of the light reduced according to the transmission characteristics of the colored condenser lens (14).

From the outside, each pixel αυ, Oa, Q3 (in Figure 2, Qυhan,
Similarly, in Fig. 2, the light incident on the surface of
For example, the intensity of sunlight is reduced according to the transmission characteristics of the condenser lens α, and the light passes through the transparent adhesive layer Oη and reaches the surface of each pixel αυ, Cao, and Qing. Furthermore, this arriving light is reflected on the surface of each pixel qη, (b), a3, passes through the transparent adhesive layer αη, and passes through the condenser lens aQ again, according to the transmission characteristics of the condenser lens oQ, The intensity of the light is reduced again, and the light is focused and emitted to the outside. That is, in this display element, the colored condensing lens ((6J) reduces the intensity of each color light emitted at each red, green, and blue pixel C11l, o, and aa only once; α1), 4. The light incident on the bright surface, reflected and emitted to the outside is reduced twice, and each pixel Ql)
, tg, and rJ3, the brightness of black color, which is the state in which no light is emitted, is lowered to increase the contrast between the full light-emission state and the non-emission state in the names, pixel divisions, (2), and (b). Furthermore, the light emitted from each pixel (6), aS, is focused in the front direction of the display element by a colored condensing lens QQ, and the light is emitted from each pixel (6).

The light emitted by the light source and aJ is colored to compensate for the decrease in intensity that occurs when passing through the condenser lens a, and the luminance of the light emitted in the front direction of the display element is increased.

Next, a display element according to a second embodiment of the present invention will be described.

This embodiment is an example in which the colored condenser lens C1l shown in FIGS. 1 and 2 is uniformly colored so as to selectively transmit red, green, and blue light. (9 is made of glass or plastic colored with one type of dye or pigment or a combination of several types of dyes or pigments. For example, in the case of glass, it can be formed by mixing neodymium oxide and chromium oxide. In this example, the light of each color emitted from each pixel 0υ, a, and aa of red, green, and blue is transmitted through the transparent adhesive layer side, and is transmitted through the condensing lens (II) and emitted to the outside. On the other hand, light that enters the surface of each pixel Qll, C3, C3 from the outside and is reflected and exits to the outside, such as sunlight, is reduced in intensity according to the transmission characteristics of the condenser lens ae, and becomes transparent. Each pixel a]J, (t3, (
Reach the surface of 13. Furthermore, the light that has arrived here is at each pixel (111).

It is reflected on the surfaces of □ and q, passes through the transparent adhesive layer aη, and passes through the condenser lens (to) again, and the intensity of the light is reduced again according to the transmission characteristics of the condenser lens αQ, and the condensed light is and then injected to the outside. That is, in the display element in this embodiment, the colored condenser lens 01 connects each red, green, blue pixel Qυ, a2 . Each pixel U, (la.

The light incident on the surface of the target, reflected and emitted to the outside is absorbed by the mixed pressure, and the luminance of black, which is the state in which no light is emitted, is lowered at each pixel co>, aa, σ1, and each pixel Qυ, (12 , increases the contrast between the fully emitted state and the non-emissive state of C3.In addition, each pixel (Ill,
a.

The light emitted from the mouth is focused in the front direction of the display element by the colored condensing lens Qe, and each pixel aυ, (6
), aJ compensates for the decrease in intensity that occurs when each color light is transmitted through the condenser lens Qll, and increases the luminance of light emitted in the front direction of the display element.

Next, a display element according to a third embodiment of the present invention will be described.

In this embodiment, the colored condensing lens aQ in FIGS. ■An example in which each location corresponding to 1 is colored a different color, and the condenser lens qe is made of glass or plastic colored with a different colored dye for each part corresponding to each pixel. Ru.

For example, in the case of glass, the part corresponding to the red pixel is made of cadmium sulfide or cadmium selenide, the part corresponding to the green pixel is made of iron oxide or cIA oxide, etc., and the part corresponding to the blue pixel is made of iron oxide. It can be formed by mixing balt or oxide. In the case of rare plastic, it can be formed by mixing an anthraquinone pigment etc. in the part corresponding to the red pixel, a phthalocyanine pigment etc. in the part corresponding to the green pixel, and a phthalocyanine pigment etc. in the part corresponding to the blue pixel.

The condensing lens αQ is separate for each part corresponding to each pixel! They may be manufactured individually, or if they are made of plastic, they may be integrally molded at once using a three-color molding machine. In this embodiment, each color light emitted from each pixel (6) of red, green, and blue passes through the transparent adhesive 1 and passes through the condensing lens 00 (transmitted and emitted to the outside). , On the other hand, light that enters the surface 1ζ of each pixel (lIυ, (b), aa) from the outside and is reflected and exits to the outside, such as sunlight, is reduced in intensity according to the transmission characteristics of the condensing lens CO and becomes transparent. The light passes through the adhesive layer O and reaches the surface of each pixel (a), (2), and C3.Furthermore, this light that reaches each pixel (6), (
The light is reflected on the surface of LD, 03, passes through the transparent adhesive layer Q7), passes through the condenser lens α, and is reduced in intensity again according to the transmission characteristics of the condenser lens OQ.
The light is focused and emitted to the outside. That is, in this embodiment (in this display element), the five-colored condenser lens aQ has red, green, and blue pixels αη, (6).

The light of each color emitted by the screen is transmitted well, but the light that enters the surface of each pixel aυ, , aa, C3 from the outside, is reflected and exits to the outside is absorbed over the mixed pressure, and the light of each pixel Qη, a , tn, the brightness of black color, which is the state in which no light is emitted, is lowered to increase the contrast between the full light emitting state and the non-emitting state of each pixel (11, 4, C1:1).

Also, each pixel aυ, a3. The light emitted by the sauce is concentrated in the front direction of the display element by the action of the colored condensing lens 4, and each color light emitted by each pixel (11), (6), and The reduction in intensity that occurs when the light passes through the condenser lens QQ is compensated for, and the luminance of light emitted in the front direction of the display element is increased.

In each of the above embodiments of the present invention, a matrix type element in which the number of pixels in one light emitting element is 4 x 4 has been described, but the number of pixels on the light emitting element is m x n (m,
n may be any integer).

〔Effect of the invention〕

As described above, according to the present invention, light from each pixel is focused on the light emitting surface of one light emitting element in which each red, green, and blue pixel is formed. Since the colored condensing lens is provided, it is possible to obtain a low-cost, high-quality display element that has high luminance, can display images with high contrast, and is easy to manufacture.

If a colored condensing lens is used that is uniformly colored so as to have uniform transmission characteristics for the transmitted light, the contrast between full light emission and non-light emission states will be enhanced.

Furthermore, if a condensing lens is used that is uniformly colored so as to selectively transmit red, green, and blue light, the contrast can be further enhanced. Even if the condensing lens is colored in a different color for each location corresponding to each pixel so as to selectively transmit the light emitted from each pixel, the contrast can be similarly enhanced.

[Brief explanation of the drawing]

1 and 2 are a front configuration diagram and a sectional configuration diagram respectively showing a display element according to an embodiment of the present invention, and FIGS.
The figures are a schematic perspective view and an exploded perspective view showing a conventional display element, respectively, and FIG. 5 is a cross-sectional configuration diagram showing a conventional display element according to the prior art. αq...Light emitting element, a number...Pixel, Ql...
Condenser lens. In addition, in the figures, the same reference numerals indicate the same or corresponding parts.

Claims (4)

[Claims] (1) Red, green, and blue pixels are formed on one light-emitting element, each of the pixels is controlled to emit light, and a target color is displayed on the light-emitting surface. A display element characterized by being provided with colored condensing lenses that condense light from each pixel. (2) The display element according to claim 1, wherein the condenser lens is uniformly colored so as to have uniform transmission characteristics for the transmitted light. (3) The display element according to claim 1, wherein the condenser lens is uniformly colored so as to selectively transmit red, green, and blue light. (4) The display element according to claim 1, wherein the condenser lens is colored in a different color for each location corresponding to each pixel so as to selectively transmit each color light emitted from each pixel.