JPS6398631A - Capsule type liquid crystal display device - Google Patents

Abstract

PURPOSE:To convert the transmission and scattering of background light into whether the quantity of transmitted light is large or small, i.e. the light and shade on a display screen by providing a selective light transmission part which is formed in front of a capsuled liquid crystal part and transmits selectively only the background light transmitted through respective picture element areas as parallel light as it is without being scattered. CONSTITUTION:The background light which is transmitted while scattered in picture element areas of the capsuled liquid crystal part 2 and then enters a front opening 31 has many components traveling to their internal wall surfaces, so almost all of the light is absorbed and little light is projected on in front of the selective light transmission part 3. On the other hand, the background light which is transmitted through the picture element areas of the capsuled liquid crystal part 2 without being scattered and enters the front opening 3 has almost none of components traveling to the internal wall surfaces, so it is passed through the opening without being absorbed and projected selectively on in front of the light transmission part 3. Consequently, the background light passing through respective openings 31 of the selective light transmission part 3 vary in quantity according to whether or not it is scattered in the picture element areas of the capsuled liquid crystal part 2.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a capsule liquid crystal display device used as a flat panel display device.

Conventional technology Liquid crystal display devices used as flat panel display devices in technical fields such as television receivers use an encapsulated liquid crystal layer consisting of a group of microcapsules encapsulating liquid crystal as a flexible layer on which transparent electrodes are formed. There is a capsule type sandwiched between a pair of transparent films.

Problems to be Solved by the Invention The above-mentioned capsule type liquid crystal display device has various advantages such as a simple structure and easy upsizing compared to a sealed type device in which liquid crystal is filled between glass plates and sealed. However, unlike the sealed type, the presence or absence of voltage application does not immediately affect the transmittance of parallel background light, but only causes parallel light to be transmitted and scattered.

Therefore, a capsule liquid crystal display device requires an efficient conversion means for converting the transmission and scattering of background light caused by the presence or absence of an applied voltage into the size of a transmitted scene.

Means for Solving the Constituent Problems of the Invention The capsule type liquid crystal display device of the present invention comprises an encapsulated liquid crystal section having a structure in which a group of microcapsules encapsulating liquid crystal is sandwiched between a pair of transparent substrates each having a transparent electrode formed thereon; a background light supply section that supplies parallel background light to the encapsulated liquid crystal section from behind, and a background light supply section that is formed in front of the encapsulated liquid crystal section;
By providing a selective light-transmitting section that selectively transmits only the background light that has passed through each pixel area in parallel without being scattered, and a light scattering section installed in front of this selective light-transmitting section. , is configured to efficiently convert the transmission and scattering of background light that occurs in each pixel region of the encapsulated liquid crystal section into the magnitude of transmittance.

Hereinafter, the operation of the present invention will be explained in detail together with examples.

Embodiment FIGS. 1, 2, and 3 are a perspective view, a partial sectional view, and a partial front view of a capsule-type liquid crystal display device according to an embodiment of the present invention, and each figure is plotted with orthogonal coordinates (X.

y, z> is shown.

1 to 3, reference numeral 2 denotes an encapsulated liquid crystal section, in which a group of hollow spherical microcapsules 23 encapsulating liquid crystal is placed between a pair of transparent substrates 21 on which a transparent common electrode 24 and a transparent pixel electrode 25 are formed. , 22. Reference numeral 1 denotes a background light supply section that supplies parallel background light to the encapsulated liquid crystal section 2 from behind. Reference numeral 3 indicates a selective light-transmitting section formed in front of the encapsulated liquid crystal section 2, which selectively transmits only the background light that has passed through each pixel area in parallel without being scattered; 4 is a color filter plate; 5 is a light-scattering translucent screen.

The selective light-transmitting section 3 is an opaque plate-like body 3 having a group of openings 31 opened opposite to the pixel area formed between each transparent pixel electrode 25 and the transparent common electrode 24 of the encapsulated liquid crystal section 2.
Consists of 0. The inner wall surface of the group of openings 35 is coated with a light-absorbing paint.

The background light that is scattered and transmitted through the pixel area of the encapsulated liquid crystal section 2 and enters the front opening 31 has a large component directed toward the inner wall surface, and is almost absorbed there, resulting in selective transmission. Almost no light is emitted in front of the light section 3. On the other hand, the background light that passes through the pixel area of the encapsulated liquid crystal section 2 as parallel light without being scattered and enters the front opening 31 has almost no component directed toward the inner wall surface. The light passes through this opening without being absorbed there, and is emitted to the front of the selectively transparent section 3.

As a result, the amount of background light passing through each aperture 31 of the selectively transparent section 3 varies depending on whether it is scattered within the pixel region of the encapsulated liquid crystal section 2.

The background light that has passed through each aperture 31 of the selective light transmitting section 3 passes through one of the RlG and B%i regions formed on the color filter temporary 4, and then passes through a light scattering layer made of a matte glass or the like. The light enters a transparent semi-transparent screen and displays a two-dimensional screen that can be viewed from a direction slightly deviated from the front direction.

4 and 5 are a partial sectional view and a partial front view showing an example of another configuration of the selective light-transmitting section 3 shown in FIG. 1.

This selective light transmitting section 3 includes a group of converging lenses 330 arranged to face each pixel region of the encapsulated liquid crystal section 2, and a focus of each group of converging lenses 33 is placed on a transparent substrate 32 such as acrylic resin. is formed on one side of the . The shutter means 34 consists of a light-absorbing paint layer coated on the other side of the transparent substrate 32 leaving only the group of openings 36.

The background light that is scattered and transmitted through the pixel area of the encapsulated liquid crystal section 2 and enters the front lens 33 is transmitted through the transparent substrate 32.
Since there are many components traveling in various directions within the light, most of them are absorbed by the shutter means 34, and almost no light is emitted in front of the selective light transmitting section 3. On the other hand, most of the background light that passes through the pixel area of the encapsulated liquid crystal section 2 as parallel light without being scattered and enters the front lens 33 is absorbed by the aperture 36 of the shutter means 34. The light passes through this opening and is emitted to the front of the selectively transparent section 3.

As a result, the amount of background light passing through each aperture 36 of the selectively transparent section 3 varies in magnitude depending on whether it is scattered within the pixel region of the encapsulated liquid crystal section 2.

FIG. 6 is a sectional view showing an example of the configuration of the background light supply section 1 shown in FIG. 1.

This background light supply unit includes a light source such as a fluorescent lamp, a spherical reflector 11. It includes a lens 12 and a curved reflecting mirror 13, and supplies parallel background light to the encapsulated liquid crystal section 2 of FIG.

7 and 8 are cross-sectional views showing other examples of the configuration of the background light supply section 1 shown in FIG. 1.

This background light supply unit 1 includes a group of transparent truncated cones 16 arranged opposite to each pixel area of the encapsulated liquid crystal unit 2 shown in FIG. It is equipped with a group of converging lenses 17 having a focal point near the tip, and is configured to convert the light emitted from an appropriate number of fluorescent lamps 14 into parallel background light and supply it to each pixel area of the encapsulated liquid crystal section 2. has been done.

A group of transparent truncated cones 16 is formed on a transparent substrate 1 made of acrylic resin or the like.
A group of converging lenses 17 is formed on one end of a transparent substrate 18 made of acrylic resin or the like that is laminated in the Y-axis direction.

Further, a printed wiring board 19 on which a wiring pattern for supplying a driving voltage to each transparent pixel electrode of the encapsulated liquid crystal section 2 is formed is inserted between the transparent substrates 18 .

Although the configuration in which the color filter plate 4 is disposed immediately in front of the screen 5 has been illustrated above, it can be disposed at an appropriate location between the background light supply section and the screen 5. Further, in the case of black and white display, this can be omitted.

Effects of the Invention As explained in detail above, the liquid crystal display device of the present invention has the following effects:
Since the configuration includes a selective light-transmitting section that is formed in front of the encapsulated liquid crystal section and selectively transmits only the background light that has passed through each pixel area as parallel light without being scattered, the encapsulated liquid crystal section The transmission and scattering of background light that occurs in each pixel region can be efficiently converted into the amount of transmitted light, that is, the brightness and darkness within the display screen.

[Brief explanation of the drawing]

1 to 3 are a perspective view, a partial sectional view and a partial front view of a capsule type liquid crystal display device according to an embodiment of the present invention, and FIGS. 4 and 5 are selective transparent views of FIG. A partial sectional view and a partial front view showing an example of another configuration of the light section 3, FIG.
FIGS. 7 and 8 are partial sectional views showing other examples of the configuration of the background light supply section 1 shown in FIG. 1. FIGS. 1... Background light supply section, 2... Encapsulated liquid crystal section, 3
...Selective light-transmitting section, 4...Color filter plate, 5
...Light scattering section, 21.22...Transparent substrate pair, 23.
... Microcapsule group, 24 ... Transparent common electrode, 2
5... Transparent pixel electrode, 30... Opaque plate-like body, 31
...Aperture opened corresponding to the pixel area of the encapsulated liquid crystal section 2, 32...Transparent substrate, 33...Convergent lens arranged corresponding to the pixel area of the encapsulated liquid crystal section 2,
34...Aperture 36 at the focal point of the converging lens
shutter means having. Patent applicant: NEC Home Electronics Co., Ltd.

Claims (4)

[Claims] (1) An encapsulated liquid crystal section with a structure in which a group of microcapsules encapsulating liquid crystal is sandwiched between a pair of transparent substrates each having a transparent electrode formed thereon; and a background light supply that supplies parallel background light to the encapsulated liquid crystal section from behind. a selectively transparent part that is formed in front of the encapsulated liquid crystal part and selectively transmits only background light that has passed through each pixel area in parallel without being scattered; and this selectively transparent part. A capsule type liquid crystal display device comprising: a light scattering section installed in front of the capsule type liquid crystal display device. (2) The selectively transparent section is formed of an opaque plate-like body having a group of openings that are opened opposite to each pixel area of the encapsulated liquid crystal section and have a light-absorbing inner wall surface. A capsule liquid crystal display device according to claim 1. (3) The selective light transmitting section includes a converging lens group arranged to face each pixel region of the encapsulated liquid crystal section, and a shutter means forming an aperture group near the focal position of each of the converging lens group. 2. A capsule liquid crystal display device according to claim 1, comprising: (4) The background light supply section has a group of transparent truncated cones arranged to face each pixel region of the encapsulated liquid crystal section, and a focus near the tip of each of the group of transparent truncated cones. 2. A capsule liquid crystal display device according to claim 1, further comprising a converging lens group.