JPS5895777A - Photo detector type display - Google Patents

Abstract

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

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a light-receiving display device with improved visibility, and particularly to a light-receiving display device that is easy to see even under direct sunlight.

Generally, the following two methods are employed to prevent visibility from being difficult to see due to reflection of incident light on a light-receiving display device such as a liquid crystal display (LCD). That is, one method is to reduce the reflection on the surface, and the second is to make the surface uneven in some way to diffusely reflect the incident light.

One way to reduce the reflectance of this type of material is to form one or more layers of a material with a lower refractive index than the base material on the surface of the base material. Although multilayer non-reflective coatings and the like are known, their use is limited because they are expensive and have many restrictions in terms of materials due to their relationship with the base material.

In addition, various methods are known for the latter method of creating a diffused reflection surface by forming unevenness, but in light-receiving display devices, the surface is made uneven (7) and an acrylic plate is processed with adhesive on one side and attached. However, with this method, the cost of making the acrylic plate uneven and adhesive processing is high.
However, when pasting the acrylic board, bubbles, dirt, etc. can get in and make it difficult to apply it uniformly, and the acrylic board tends to peel off under high temperature and high humidity conditions, making it thicker. Ta.

In addition, directly forming the entire uneven surface on the substrate t such as glass of the light-receiving display element reduces the productivity of desired fine unevenness processing.
When manufacturing a large number of cells at the same time, there are problems with cleaning, cutting, and damage to the jig.

For this reason, most light-receiving display devices were constructed without taking these reflection IE measures, so especially during the daytime, strong external light is reflected on the cell surface and directly enters the eye. This has the disadvantage that the display becomes extremely difficult to see depending on the viewing angle.

The present invention has been made in order to eliminate the drawbacks of the conventional light-receiving type display device as described above, and it is a light-receiving type display device comprising an electro-optic display material disposed between at least two conductive films. This is a light-receiving type display device in which a thin layer having fine convex and concave surfaces is formed by screen printing a transparent ink containing resin as the main component and 2 to 20 wt% of fine gold particles mixed into the resin. .

Fine particles in the present invention? Since the transparent ink gold mixed with the resin is used, it is easy to form the anti-reflection layer, and a light-receiving display device with high anti-reflection performance can be obtained. Since this anti-reflection layer is directly adhered to the substrate, it does not peel off like a film, and there is no problem even if the substrate is uneven due to other printed layers such as letters and figures. It also has the advantage that an anti-reflection layer can be formed without the need for the anti-reflection layer.

FIG. 1 is a cross-sectional explanatory diagram of an example of the substrate of the present invention, and FIG.
The figure is a partially enlarged explanatory diagram.

In both figures, (11A) is the front glass substrate of the liquid crystal display device, (13A) is the polarizing plate, (14) is the anti-reflection layer, (
14A) shows fine particles. Note that the thickness of each layer in the drawings has been enlarged or reduced for clarity.

The incident light (I) incident on this substrate is diffusely reflected (R) in various directions by the fine irregularities on the surface and the fine particles (14A) in the anti-reflection layer, and does not produce strong reflected light in a specific direction.

3 and 4 are cross-sectional explanatory diagrams of the liquid crystal display device of the present invention, (11A) and (21A) are front glass substrates, (11B) and (21B) are actually measured glass substrates, and (12A) are front side glass substrates.
), (12B), (22A), (22B) are transparent electrodes,
(13A).

(13B), (23A), (23B) are polarizing plates, (14
), (24) are the antireflection layer of the present invention, (15), (2
5) is a seal, (16) and (26) are liquid crystals, and (27) is a mask printing section.

The example shown here is a typical example of the present invention, and the present invention is applicable not only to liquid crystal display devices but also to other light-receiving display devices such as electrochromic display devices (ECDs)7. Furthermore, liquid crystal display devices are not limited to the TN type using two polarizing plates as shown in this example;
Color filters, color polarizing plates, ultraviolet cut filters that can be used in various modes such as type, phase change type, DAP type, and guest host type, reflective type, semi-transparent type, and multilayer of two or more layers. , a reflective plate may be laminated, other display elements may be partially incorporated, a touch switch may be provided, and the display may also be performed.

It is possible to display numbers, characters, and per graphs using segments, and to display numbers, characters, and graphics using dot matrix.

In addition, in FIG. 4, the mask printing part is provided on the anti-reflection layer, but this may be reversed, and since the present invention uses a fluid called transparent ink, the substrate to which the transparent ink is applied is It is not a problem even if the unevenness is b.

The transparent ink used in the present invention contains 2 to 20wt of fine particles.
It is a transparent ink made of a resin mixed with 100% resin, and can be colored in a specific color if necessary.

This transparent ink is applied onto the substrate by screen printing to form mesh-like irregularities on the screen.

In the present invention, since screen printing is used, printing can be performed without any influence even if the substrate has irregularities of several tens of micrometers, and an antireflection layer having good antireflection performance can be easily formed.

In addition, in the present invention, since fine particles are mixed into the transparent ink, the reflectivity of the tag is further improved.
As shown in Figure 2, the light is diffusely reflected by the uneven surface on the surface of the anti-reflective image layer, and a part of the light that enters the anti-reflective layer is also diffusely reflected by the fine particles, so that strong reflected light in a specific direction is not generated. .

For this purpose, the amount of fine particles must be 2 to 20wt1%.If it is less than 2wt%, there is almost no effect of fineparticle mixing, and if it exceeds 20wt%, the display itself of the light-receiving display device becomes difficult to see. 'Owt staff.

It is preferable to use particles with a diameter of 20μ or less; if the diameter is too large, the haze value will increase;
This will adversely affect the visibility of the display, reduce screen printability, and increase the thickness of the anti-reflective layer. It is preferable to determine the optimum value of gold for each fine particle to be used, and for some fine particles it is 3 to 8 wt%.
However, since 5 to 12 wt% is preferable for other fine particles, a suitable range of 2 to 20 wt% may be found experimentally and used.

Further, two or more types of these fine particles may be used in combination, and it is preferable to mix them in consideration of visibility and screen printing workability.

Specifically, these fine particles include 5i02, Al2O
3. Inorganic particles such as TiO□ and OaCO3, organic particles such as polyethylene, polystyrene, fluororesin, polypropylene, polyurethane, polyamide, and polycarbonate may be appropriately selected and used.

Particularly when relatively large particles are used, it is preferable to use resin particles with a refractive index close to that of the film formed by the transparent ink because reflection at the particle interface is reduced.

The thickness of this anti-reflection layer may be approximately 4 to 20 microns on average, and may be adjusted to optimize visibility in consideration of the size of the fine particles.

Depending on the transparent ink, the cost may be higher, but it may be made thicker.

The anti-reflective layer may be printed after the light-receiving display element is assembled, or before the anti-reflective layer is assembled as long as the sealing process, sealing process, aging process, etc. do not adversely affect the anti-reflective layer. good.

Next, the present invention will be explained in detail.

Example 1 Transparent acrylic ink (manufactured by Yoshikawa Kako Co., Ltd. "7o.170")
c1θarj) as fine particles manufactured by Nippon Aerosil Co., Ltd.
When 5 to Zwt of oovJ (about 7 mμ in diameter) was mixed in and printed on a glass plate using a 325 mesh screen printing plate, excellent performance as shown in Table 1 was obtained.

Table 1 The transmittance is measured using a light transmittance meter “HG” manufactured by Toyo Rika Kogyo Co., Ltd.
M-1", the resolution is 1 a
The distance is shown as the distance at which the m square black dot becomes indistinguishable.

When this mixture of transparent acrylic ink and fine particles was printed on liquid crystal display elements, there was little glare and the display was easy to see.

Example 2 When 10 to 16 wt % of our company's Aflon J (625 meso/Yupas product) was mixed into the same acrylic transparent ink as in Example 1, excellent performance was obtained as shown in Table 2.

When this mixture was printed on a liquid crystal display element, as in Example 1, it was found that there was little glare and the display was easy to see.

Table 2 As described above, in the light-receiving display element of the present invention, transparent ink is printed on the surface of the light-receiving display element in the form of bundles, so that the effect of preventing total reflection that makes the display difficult to see is obtained.
Moreover, it has the characteristics of being easy to work with and having good productivity, and can be applied in various ways to various light-receiving display elements including liquid crystal display elements in the future.

[Brief explanation of the drawing]

FIG. 1 and FIG. 2 are cross-sectional explanatory views explaining the present invention in detail. 3 and 4 are cross-sectional explanatory views of representative examples of the present invention. 11A, 21A: Front glass substrate 14. 24: Anti-reflection layer 14A: Fine particles'' 72 Procedural amendment (voluntary) June 1980 r Haruki Shimada, Commissioner of the Patent Office Light-receiving type display device 3, amendment Relationship with the Noise Person Case Patent Applicant Address 2-1-2 Marunouchi, Chiyoda-ku, Tokyo Name
(004) Asahi Glass Co., Ltd. 4, Agent No. 2 Bunsei Building 5, Date of amendment order 6, Subject of amendment (1) Scope of claims in the specification (2) Detailed description of the invention in the specification (3) Brief description of drawings in the specification (4) Drawing 7, content of amendment (1) The scope of claims in the specification will be amended as shown in the attached sheet. (Claim 2 of the claim is deleted.) (2) On page 3 of the specification, line 15, after "to this,""the particle size is less than 1 μm."
join. (3) Between lines 7 and 8 on page 4 of the specification, it says, “In particular, in the present invention, particles with a particle diameter of less than 1 μm, that is, on the order of millimicrons,
In particular, since fine particles of 2 to 200 mμ are used, not only good antireflection performance but also good resolution is achieved, and the display will not become unclear due to large particles. ” to join. (4) Insert the following text between lines 18 and 19 of the same page. [However, if the mixed particles are large,
In other words, when the particle size is on the order of microns or more, the scattering of light by the particles increases, causing strong scattering in a specific direction.
-Although the anti-reflection effect appears to be great, when viewing the display, light must pass through the anti-reflection layer, and the transmitted light is scattered by the particles, reducing the clarity of the display. This is because if the display pattern is large and thick, large particles will not have a big effect, but if the display is fine, the lines will become distorted or blurred, reducing visibility. If the diameter of the mixed particles is large, the light entering from the top surface of the display element will be blocked as described above, and the amount of diffusely reflected light will increase, causing the anti-reflection film to appear cloudy. The amount of reflected light increases. In addition, regardless of whether the liquid crystal display element is a transmissive type or a reflective type, the light power travels from the bottom of the display, so as the particle size increases, the area where light traveling from below is blocked increases. do. For these reasons, the resolution differs. Figure 5 shows the relationship between resolving power and particle size when the particle size is changed from 7 mμ to 20 μ and the same reflection image prevention state is achieved. The distance between the lines was determined by the distance at which the lines could no longer be distinguished when viewed through this membrane. When the particle diameter is 200 mμ or less, if an appropriate amount is mixed in and a film having an appropriate anti-reflection effect is formed by screen printing, the clarity of the display will hardly be affected. Therefore, the diameter of the particles mixed into the ink is rd 20
From the viewpoint of resolution, it is preferable that the resolution is 0 mμ or less, preferably about Fi5 to 50711μ. (5) Lines 8 to 20 of page 7 of the specification: [It is preferable to use particles with a diameter on the order of millimicrons of less than 1 μm, more precisely, with a diameter of 200 mμ or less; If it is too thick, the haze value will increase, which will have a great negative effect on the visibility of fine displays, and will likely cause drawbacks such as a decrease in screen printability and an increase in the thickness of the anti-reflection layer. It is preferable to use the amount of fine particles by determining the optimum value for each fine particle to be used depending on the particle size, particle shape, material, etc., and a suitable value within the range of 2-20 wt% has been experimentally found. Just use it. If these fine particles are mixed in an unnecessarily large amount, the printability may deteriorate rapidly due to a decrease in resolution and an increase in viscosity.In general, it is preferable to use 10% or less, and in particular, 3- It is preferable to mix 8%. ” is corrected. (6) Lines 10 to 19 of page 9 of the specification are corrected as follows. "Chapter 1, the transmittance ■ is the light transmittance meter "u" manufactured by Toyo Rika Kogyo Co., Ltd.
eM-t''2. The transmittance (2) is the value at a wavelength of 460 mμ measured using an ultraviolet-near infrared spectrophotometer Model 323 manufactured by Hitachi, Ltd. Glossiness was measured using a GMX-2008 model manufactured by Murakami Color Research Institute at an incident light angle of 60'.
This is the value measured at The resolution is the distance at which lines with a line width of 100 μm and an interval of 100 μm are printed on glass with a thickness of 1.1 m for the anti-reflection layer and cannot be identified when viewed through the anti-reflection layer. (7) Delete lines 5 to 18 on page 10 of the specification. (9) Figure 5 Claims (Li) A light-receiving display device comprising an electro-optical display material disposed between at least two conductive film substrates, the surface of which contains a resin as a main component, and a particle size of the resin. A light-receiving display device formed entirely of a thin layer having a finely uneven surface by screen printing a transparent ink containing 42 to 20 wt % of fine particles of less than 1 μm.

Claims (2)

[Claims] (1) In a light-receiving display device in which a mineral optical display material is disposed between substrates having at least two conductive films, the surface thereof is mainly composed of a resin, and 2 to 20% of fine particles are coated on the surface thereof.
A light-receiving display device formed by screen printing a transparent ink mixed with wt% to form a thin layer having a finely uneven surface. (2) The light-receiving display device according to claim 1, wherein the fine particles have a diameter of 20 μm or less.