KR910001811Y1 - Liquid crystal display of large shape - Google Patents

Abstract

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Description

[Designation name]

Large liquid crystal display

[Technical Field]

The present invention is a large-screen display, and relates to a large liquid crystal display used for the projection and advertisement of stations, airports, etc., or projections such as homes and theaters.

[Background]

Since liquid crystal displays can be displayed at low power, they have been widely used in watches, electronic calculators and the like. In recent years, large liquid crystal displays have been developed by disposing a plurality of display elements. This is to comply with public and social demands that inform many people at once.

The configuration of the liquid crystal display device constituting such a large liquid crystal display will be described with FIG.

This liquid crystal display element is a two transparent substrate which transmits the light from a light source, arrange | positions the sealing resin 2 in the periphery of glass plate 1a, 1b, forms a constant gap, and the liquid crystal 3 inside It is enclosed. In addition, transparent electrode extracting portions 4a and 4b are formed on two glass plates 1a and 1b, and the electrode extracting portions 4a and 4b are connected to a driving circuit (not shown). Moreover, the polarizing plates 5a and 5b are affixed on both outer surfaces of the glass plates 1a and 1b, and the liquid crystal display element is comprised by this. Moreover, the diffuser plate 7 is attached to the light source 6 side of the polarizing plate 5b of this liquid crystal display element.

The large liquid crystal display is constructed by disposing a plurality of the liquid crystal display elements on the same plane to form a large screen. 2 shows a large liquid crystal display configured in this manner, and a plurality of liquid crystal display elements 8 having the above configuration are disposed. In FIG. 2, reference numeral 9 denotes a joint of adjacent liquid crystal display elements 8, and reference numeral 10 denotes a lead wire for connecting the electrode extraction portions 4a and 4b to the driving circuit. Here, the electrode extraction section 4a is also drawn out and connected to the electrode extraction section 4b.

However, in such a conventional large liquid crystal display, the seal resin 2 and the electrode extraction portions 4a and 4b located on the joint 9 from the front surface (opposite to the light source 6) are identified, The frame of each liquid crystal display element 8 was formed, and as a result, the situation where a gridless display line was seen on a large liquid crystal display occurred.

For this reason, it becomes difficult to see the image on the whole screen, and this has become the biggest factor which hinders the spread of the large liquid crystal display.

[Initiation of draft]

The present invention solves such a conventional problem, and the luminance of the entire screen is generally replaced without visually confirming the non-display line caused by the seal resin portion or the electrode extraction portion located at the joint of the plurality of liquid crystal display elements. It is to provide a large liquid crystal display that makes it possible to equalize.

In order to achieve this object, the liquid crystal display of the present invention provides a plurality of liquid crystal display elements on which the liquid crystal is disposed between the transparent substrates that transmit light from a light source on the same plane, and the display portion of the liquid crystal display element includes one liquid crystal. A plurality of light guides constituted by one or more light guide elements mounted on the display element and inducing light rays are provided to cover the display unit of each liquid crystal display device with the light guides. The joint is also covered. According to this configuration, the screen is formed by the light guide so that the seams of the plurality of liquid crystal display elements are also covered, so that no gridless display lines appear, and the luminance of the entire screen of the large liquid crystal display is substantially equalized visually. The whole can be made good.

[Brief Description of Drawings]

1 is a diagram showing the configuration of a general liquid crystal display element.

2 is a schematic configuration diagram of a conventional large liquid crystal display

Figure 3 is a schematic block diagram showing an embodiment of a large liquid crystal display according to the present invention.

4 is an open block diagram showing an enlarged portion of the nursery rhyme.

5 is an enlarged perspective view of the light guide constituting the display of the present invention.

6 and 7 is a block diagram of a light guide consisting of an enlarged reflection surface and a mirror surface for explaining the present invention.

8 is a perspective view showing one of the units constituting the large liquid crystal display of the present invention.

9 is a perspective view showing a state in which a large liquid crystal display is obtained by combining copper units.

10, 11 and 12 are schematic configuration diagrams showing different embodiments of the present invention, respectively.

* Explanation of symbols for main parts of the drawings

1a, 1b: glass plate 2: seam resin

3: liquid crystal 4a, 4b: electrode extraction part

5a 5b Polarizing plate 6 Light source

7: diffuser plate 8: liquid crystal display device

9: seam 10: lead wire

11: Return 12: Light guide element

13: light guide 14: adhesive portion

15: solid 16: mirror surface

17: black mountain reflecting surface 18, 20: frame

19 liquid crystal display unit 21 diffuser plate

22: color filter

[Best Form to Implement Design]

Hereinafter, embodiments of the present invention will be described with reference to the drawings. Here, in the embodiment of the present invention, the same parts as those in the prior art are given the same numbers, and description thereof is omitted.

3 to 5 show one embodiment of the present invention. First, a plurality of liquid crystal display elements 8 having the above-described configuration are disposed on the same plane, and a plurality of light sources 6 are provided on the rear side thereof. Reference numeral 9 denotes a joint of the adjacent liquid crystal display element 8, and reference numeral 10 denotes a lead wire for connecting the electrode extraction portions 4a and 4b to the driving circuit.

Here, the electrode extraction portion 4a is also drawn out and connected to the electrode extraction portion 4b as described above. However, in the present invention, the light guide element 12 has a size coinciding with each element 11 formed of the transparent electrode in the liquid crystal display element 8 in the direction of viewing the liquid crystal display element 8. Plurally installed so as to guide the light beam of each combustion element 11. The shape of the light guide element 12 is larger than that of the cross section connected to the cross section 11, and the display area is enlarged. In addition, the light guide 13 corresponding to one liquid crystal display element 8 is an aggregate of a plurality of light guide elements 12, has a honeycomb shape, and has an area of an opposite cross section connected to each element 11. If the sum includes the bonding portions 14 between the light guide elements 12, the liquid crystal display element 8 has the same size as the area obtained by adding half the width of the joint 9, but has a size comparable to that of the light guide element 12. From this structure, the light guide element 12 constituting the honeycomb-shaped light guide 13 is necessarily present on the joint 9. As shown in FIG. 5, the light guide element 12 has a cylindrical shape made of a resin molded article such as acrylic, ABS (acryl, butadiene, styrool) resin, or a metal molded article. On the inner surface of the solid 15, for example, a reflecting surface of aluminum or the like is formed a mirror surface (total reflection surface 16) made of metal. It is practical to form this mirror surface 16 by vapor-depositing aluminum from the surface of reflectance and a maneuverability. The light guide element 12 may be configured such that a mirror surface (keyboard reflection surface) having a high reflectance is formed on an outer surface of a solid having high transmittance.

Here, the light guide element 12 requires the mirror surface 16 as shown in the comparison of FIG. 6 and FIG. 7, and the light source 6 is the diffuse reflection surface 17 shown in FIG. The light ray A which has electrically transmitted through the liquid crystal display element 8 from the diffuse reflection reflects on the black acid reflecting surface 17, and in particular, the component B toward the light source 6 in the reflecting component is the diffuse reflecting surface 17 ) And the glass plate 1b face repeatedly, resulting in a reduction in the amount of light. Therefore, the amount of light output from the display portion is greatly reduced.

On the other hand, in the case of the mirror surface 16 of FIG. 7 showing the embodiment of the present invention, since the incident angle and the reflection angle are the same, and the reflectance is high, the number of reflections is minimized, and the light amount is extremely small. Lose. That is, since the light guide element 12 needs to guide the light beams from each of the elements 11 to be completed with the minimum amount of light, the light guide element 12 must be the mirror surface 16.

In this case, aluminum is deposited on the inner surface of the cylindrical solid 15 made of ABS resin having the light guide element 12 constituting the honeycomb-shaped light guide 13, for example, air-conditioned inside. In consideration of the configuration in which the mirror surface 16 is formed, the reflectance is approximately 83 to 85%. For this reason, the peripheral light guide element 12 is required to make the inclination angle θ shown in FIG. 4 almost 10 degrees (when the guest-host type liquid crystal is used for the liquid crystal 3). . Although it is not preferable to set it as 10 degree in this way to make the inclination-angle ((theta)) close to 90 degree, and to shorten the light guide element 12 to make it light weight, in reality, the reflectances 83 ~ From the relation with 85%, if the angle θ is too large (experimentally 20 degrees or more), the number of reflections by the reflective surface of the light beam (mirror surface 16) increases, resulting in a decrease in luminance, resulting in a luminance stain. Because it occurs, the angle θ is about 10 degrees. Further, the closer to the center of the panel, the more the display area area of the light guide element 12 needs to be equivalent, so that the inclination angle θ becomes close to zero.

Moreover, as the liquid crystal 3 arrange | positioned at the said liquid crystal display element 8, the conventionally known twisted nematic (TN) type liquid crystal, guest-host (GH) type liquid crystal, and other types of liquid crystals can be used. Can be. Generally, TN type liquid crystals or G-H type liquid crystals are used, and each has advantages and disadvantages. In addition, the TN-type liquid crystal is suitable for a display device centering on the character display. In other words, the use of TN liquid crystals does not require gradation and has the advantage of relatively bright characteristics. On the other hand, although the viewing angle varies depending on the panel configuration, the angle (visible angle) at which the surface luminance becomes 1/2 with respect to the front surface is about 30 degrees, and a plurality of liquid crystal display elements are disposed on the same plane as the present invention. The disadvantage is that it is not suitable for such displays.

On the other hand, the GH type liquid crystals described in Japanese Patent Laid-Open No. 47-3778 have lower transmittances than TN type liquid crystals, so that the brightness of the screen is slightly lowered, but the viewing angle is about double. In large displays, GH liquid crystals are advantageous. In addition, the G-H type liquid crystal has a merit in that the transmittance curve through which light passes through the panel with respect to an applied voltage is poor, and the gray level control is also excellent, and is suitable for video display. The lack of brightness of the screen described above can be covered by the power of the optical window.

8 attaches one liquid crystal display holder 8 to the frame 18, and arranges the light guide 13 on the front surface of the liquid crystal display device 8 so that one liquid crystal display device unit 19 is provided. As shown in FIG. 9, the liquid crystal display unit 19 is fixed in a state in which a plurality of the liquid crystal display units 19 are arranged in a row in a vertical direction and a horizontal direction, and a frame 20 is installed around it. It can be used as the liquid crystal display of the screen.

10 shows an embodiment in the case where the diffuser plate 21 is connected to the entire surface of the light guide 13. The diffusion plate 21 has a light diffusing property made of acryl or polycarbonate, and is accentuated on the entire surface of the light guide 13 by the fitting of the recess and the protrusion or adhesion by an adhesive. By this structure, by switching each element of the liquid crystal display element 8, the luminous flux emitted from the back light source 6 passes through the liquid crystal display element 8, passes through the light guide 13, The light beam passing through the light guide 13 is diffused by the diffusion plate 21 on the front surface, so that the viewing angle is widened. In addition, in response to each of the light guide elements 12, a color filter 22 for color reproduction of R, G, and B is formed on the front surface of the diffusion plate 21 as color printing. That is, by passing the light of the light guide 13 through the diffusion pin 21 and passing through the color filter 22, it is possible to select a preferable color wavelength.

In addition, in the above embodiment, one light guide element 12 has a size that covers the outer circumference of one element 11 in the liquid crystal display element 8, but the element of the liquid crystal display element 8 is described. Depending on the arrangement, as shown in FIG. 11, for example, a combination of R, G, and B may be used as a unit to cover the plurality of elements 11 with one light guide element 12. Alternatively, a configuration in which one liquid crystal display element 8 is covered with one light guide element 12 as shown in FIG. 12 may be considered depending on the number of times and the number of times.

Industrial availability

As described above, the large liquid crystal display of the present invention is constructed, and light guides for inducing light rays in each element of the plurality of liquid crystal display elements are arranged on the front surface of the liquid crystal display element, and a plurality of seal resins are disposed at the joint of the liquid crystal display element. By placing the light guide on the portion or the electrode extraction portion, no gridless display lines appear in the visual field, and the luminance of the entire screen can be equalized, so that the image of the entire image can be made good. Since the light guide is composed of a mirror surface (total reflection surface), unlike the diffuse reflection surface, only a little light energy loss occurs, so that the luminance deterioration of the entire screen can be comparable to that of a screen without a light guide.

Claims (1)

In a large liquid crystal display in which a plurality of liquid crystal display elements 8 in which the GH type liquid crystals 3 are disposed between transparent substrates 1a and 1b that transmit light from the light source 6 are arranged on the same plane, The mirror surface 16 is formed by depositing aluminum on the inner surface of the resin molded article 15 having a cylindrical shape, and the same number of light guide elements as the number of elements 11 of the liquid crystal display element 8 is formed. 12) is provided with a plurality of light guides 13 for guiding one of the light beams, and on the front of the light guide 13, a diffuser plate 21 made of acrylic resin is disposed, and the diffuser plate 21 Color ink of R, G and B is printed on the front surface, and the light guide 13 is made larger in area of the cross section opposite to the area of the cross section connected to the liquid crystal display device 8, and these light guides (13) covers the display portion of the liquid crystal display element 8 and at the same time The seam 9 of the positive display element 8 is also covered, and the light guide element 12 is installed inclined with respect to the plane of the glass substrate 1b constituting the liquid crystal display element 8, respectively. A large liquid crystal display in which the angle of inclination of these light guide elements 12 is made largeest in the periphery of the panel as it approaches the center of the panel.