JPS6236637A - Display device - Google Patents

Abstract

PURPOSE:To effective utilize light and to reduce the quantity of irradiated light by arraying plural picture elements obtained by forming light controlling elements on the surface of a transparent substrate and forming condensing parts on respective picture elements. CONSTITUTION:Plural picture elements 13 are arrayed by forming driving elements for controlling light on the surface 11a of the transparent substrate 11 and optical parts 14 for converging light are formed on the surface 11b side. Light irradiated from the surface 11b side is converged by the parts 14 and passed through only a light controllable area 15 to generate the intensity change of light and display its image. Since the irradiated light is not shielded by the elements 12, the whole light can be effective utilized and the quantity of irradiated light can be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a display device. In particular, the present invention relates to a display device that includes a driving element built into a pixel and controls illumination light to display a display.

BACKGROUND OF THE INVENTION FIG. 2a shows a cross section of a main part of a conventional display device, specifically a display device using liquid crystal, and a planar structure of the main part thereof. A conventional liquid crystal display device has a first
It has a structure in which a liquid crystal 23 is inserted between a transparent substrate 21 and a second transparent substrate 22, and a liquid crystal driving circuit 24 provided on the first transparent substrate 21 and the second transparent substrate controls the amount of light passing through the optical filter or the amount of light passing through the optical filter. The refractive index difference is controlled and displayed using a liquid crystal, and the amount of light of the plurality of pixels 27 is controlled to display an image.

For example, in an active matrix drive system using a TN twisted nematic liquid crystal, two deflection filters 26 are used.
A voltage is applied between the drive electrodes 241L and 240 in the drive circuit 24 in one pixel 27 by the switch element 24d (see Figure 2), and the drive electrodes 24a, 240
Display is performed by changing the birefringence difference between the TN liquid crystals sandwiched between them to change the amount of light. Color display is achieved by using a color filter as the optical filter 25 (for example, Atsushi Matsumoto, ed.; Electronic Display Devices, Ohmsha (1986)).

Problems to be Solved by the Invention In such a conventional display device, as shown in the main cross-sectional structure of FIG. 3, light emitted from the first transparent substrate 21 side,
Among them, only the light L2 that passes through the liquid crystal 23 layer between the drive electrodes 24a and 240 driven by the liquid crystal and passes through the aperture 26& of the optical filter 26 is used as display light. However, other light passes through the liquid crystal layer that is not driven, so it cannot be used for display, and the light is blocked by the cut portion 25b of the optical filter.

Therefore, if the dimensions of one pixel are reduced in order to increase the display density of the display device, the wiring 24b and the switch element 24d
The area of the driving electrode 24& becomes relatively large,
It becomes difficult to use light effectively. For example, this is a particularly important problem in devices such as pocket televisions that require low power consumption for illumination.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a display device with a simple configuration, effective use of light, and low power consumption.

Means for Solving the Problems In order to solve the above-mentioned problems, the present invention arranges a plurality of pixels provided with drive elements for controlling light on the first surface of a first transparent substrate, and collects light in each pixel. It is equipped with optical components that emit light.

Effects The present invention can utilize light effectively with the above configuration, and thus can reduce the amount of illumination.

Example FIG. 1 shows an embodiment of the display device of the present invention.

The figure shows the cross-sectional structure of the main part.

In FIG. 1, a plurality of pixels 13 each having a driving element 12 for controlling light are arranged on the first surface 11a of the first transparent substrate 11, and in each pixel 13, for example, the first surface 11a of the first transparent substrate 11 faces the first surface 111L. An optical component 14 for condensing light is provided on the second surface 11b. In the configuration of this embodiment, for example, the operation of the pixel 13 & will be described. Second surface 11b
The light illuminated from the side is condensed by the optical component 14, and the light passes only through the control area 15 where the light can be controlled, causing a change in the intensity of the light to be displayed. Since the illumination is not blocked by the control element 12, all of the light can be controlled and used effectively.

In the above description, the optical component 14 is provided on the second surface 11b, but the optical component 14 may have a structure in which it is disposed at a position on the first surface where it condenses light, and is limited to being disposed on the second surface 11b. It is not something that can be done. That is, it may be provided within the first transparent substrate 11 or outside the first transparent substrate 11.

FIG. 4 shows a second embodiment in which a liquid crystal is used in the display device of the present invention. In the figure, a is a cross-sectional view of the main part, and b is a diagram showing the planar structure of the main part. That is, the first transparent substrate 11 and the second transparent substrate 4
A liquid crystal layer 42 is provided between the pixel 1 and the pixel 43. In the figure, each pixel 43 is supplied with power through a wiring 44 and is driven.

- The optical component 14 may be one that condenses illumination. It may be a convex lens, a semi-cylindrical lens, a Fresnel lens, etc. As a specific example, a configuration in which Fresnel lenses are arranged for each pixel 43 is shown in FIG. In the figure, 51 is a Fresnel lens provided in each pixel.

The operation of the configuration shown in FIG. 4 will be shown in accordance with FIG. In the same figure, 11, 12, 14, 11a are in Figure 1 and 25
．． 25a and 25b are 41°42.43.44 with Fig.2
is the same as in Figure 4. In the configuration according to this embodiment, light is projected from the first transparent substrate 11 side. For example, pixel 4
31L, the light projection L□ is, for example, a Fresnel lens 14.
The beam diameter is narrowed down. On the first surface 11&, the drive electrode 12 that drives the liquid crystal 42! When the focal length of the Fresnel lens 14 is set so that the projected light L3 passes through L, all of the projected light L3 is directed to the drive electrode 12a.

12b is applied. That is, these optical components
As shown in Figure C, since it can be configured in a rectangular shape on a plane, all of the light emitted from each pixel is transmitted by the drive electrode 12! It becomes possible to pass L.

Therefore, all the light of the projected light L3 is directed to the drive electrode 12a.

, 12b, it is possible for all elements to undergo the necessary changes in display by the liquid crystal. For example, when a TN liquid crystal is used, the birefringence of the light changes, and the two polarizing plates 61
By passing through, all of the projected light L5 is effectively changed in intensity and operates as an element device.

In the above description, an embodiment in which the Fresnel lens is provided on the first substrate has been described, but if a polarizing plate is used, the effects of the present invention will be the same even if it is provided on the polarizing plate.
Included in the present invention. Further, when light is projected from the second substrate side, it is clear from this embodiment that a Fresnel lens is provided on the second substrate or on the polarizing plate, and is included in the present invention.

Next, a third embodiment of the present invention is shown in FIG. The figure shows the cross-sectional structure of the main part. In the same figure, 11.12,1
3, 14.15111&, 11b are the same as in FIG. That is, this is an example of a display device using an electro-optic material as the first transparent substrate 11, and an area separated by a broken line corresponds to one pixel 71. In the third embodiment, the first transparent substrate 11 is made of, for example, P L Z T , LiNbO
Use a grade 5 electro-optic material. The birefringence of these materials changes when a voltage is applied. Therefore, by inserting the first transparent substrate 11 between the polarizing plates 72, a change in intensity can be obtained, resulting in a display device.

For example, taking the pixel 71L as an example, the second transparent substrate 11b
When the light L4 is irradiated from the side, it is focused by the optical component 14, and the irradiated light L4& passes only through the control area 15 where the light of the drive element can be controlled, and changes in the intensity of the light are received and displayed. Since the illumination light L4& is not blocked by the drive element 12 and passes only through the control area 16, the illumination can be used effectively.

In the above explanation, an embodiment in which the optical components are provided on the first transparent substrate has been described, but if a polarizing plate is used, even if the optical components are provided on the polarizing plate, the structure is essentially the same as the structure according to the present invention. Yes, it is included in the present invention.

Effects of the Invention As described above, according to the present invention, light can be used effectively by simply providing optical components, and the power consumption required for illumination can be reduced, so it is extremely useful in practice. It is.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a main part of a display device according to an embodiment of the present invention, FIG. 2a is a sectional view of a main part of a conventional display device, and FIG. Shown in the same figure is a plan view of the main parts,
FIG. 5 is a plan view of essential parts of a second embodiment of the present invention in which a Fresnel lens is used as an optical component, FIG. 6 is a side view showing the operation of the second embodiment, and FIG. 7 is a plan view of the present invention. FIG. 2 is a cross-sectional view of a main part of the display device according to the present invention. DESCRIPTION OF SYMBOLS 11...First transparent substrate, 12...Control electrode, 13...Pixel, 14...Optical component, 15...Control area . Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
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Claims (3)

[Claims] (1) A display device characterized in that a plurality of pixels each provided with a driving element for controlling light are arranged on the first surface of a first transparent substrate, and an optical component for condensing light is provided in each pixel. (2) A display device according to claim 1, characterized in that a liquid crystal layer is provided between the first transparent substrate and the second transparent substrate to form pixels. (3) The display device according to claim 1, wherein the first transparent substrate is made of an electro-optic material.