WO2011091610A1

WO2011091610A1 - Front light billboard device

Info

Publication number: WO2011091610A1
Application number: PCT/CN2010/070443
Authority: WO
Inventors: 秦厚敬
Original assignee: Qin Houjing
Priority date: 2010-01-27
Filing date: 2010-02-01
Publication date: 2011-08-04
Also published as: CN101739917A; CN101739917B

Abstract

A front light billboard device is provided. The device comprises a light guide plate (2) and a billboard. At least one end surface (3) of the light guide plate (2) is provided with a light source (1). The light guide plate (2) is in contact connection with a surface of the billboard by transparent convex points (5) without gaps. Totally reflected light in the light guide plate (2) is guided to the front surface of the billboard by the transparent convex points (5). Light leakage holes are formed in the light guide plate (2) corresponding to the positions of the transparent convex points (5).

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a light billboard device, and more particularly to a positive light billboard device for use in an advertising print or a liquid crystal panel illumination of a small area of daily life. BACKGROUND OF THE INVENTION

The common backlight illumination mode is based on the acrylic advertising light box. Most of the fluorescent tubes are arranged in the light box, and the semi-transparent material such as atomized acrylic sheet is used as the side plate of the light box to achieve a uniform surface light source effect. As a backlight for transparent advertising patterns or texts, such backlight boxes have uniform light, mild, and high compatibility with the environment. The main drawback is that the light passes through the atomized acrylic sheet and the advertising drawings to achieve a low proportion of advertising backlights. Fluorescent tube-type backlighting, which has a light utilization efficiency of only about 10%, is a high-energy, mercury-containing advertising product. The appearance of the box lighting lacks changes. The location and size are not easy to install and install. It is not convenient to maintain the internal wiring. The internal light source and reflector cover occupy a large volume, which is not easy to meet the light and thin targets. The indoor advertising setting will shield the original light distribution. During the strong wind season, the outdoor billboard box is dropped.

The high-end billboards in the room require beautiful appearance, avoid stray light, save energy, and are non-toxic, and achieve the effect of advertising attracting attention. The light guide type advertising lighting method is gradually taken seriously. The advertisement application of the existing light guide plate is as follows: Example 1, after the pattern and text drawn on the computer are cut by a color transparent sticker, such as the "Card Point West Germany" sticker of 3M Company, it is attached to the light guide plate. Forming backlight or positive light advertising lighting effect, is a combination of traditional light box advertising production technology and light guide plate. The advantage is that it is beautiful, does not occupy space, and can have the characteristics of LED. The disadvantage is that it has only a simple pattern advertising effect, and the illumination of a large area is uneven, and is generally applied to indoor directivity indication. Example 2: The whole light guide plate is engraved with the V-groove of the text or image line by the CNC numerical control machine. The advantage is that the V-groove of the pattern has a prominent scattering effect on the positive light, but the slits in different directions have different folds and reflected light. Directional, not suitable for all angles of view, and the proportion of stray light direct eyes is high, there are restrictions on the expression of delicate patterns or colors, generally used for simple indication function. Example 3: Using the transparent glue to adhere the advertising drawing to the light guide plate to achieve the effect of the positive printing billboard of the whole printing advertisement, but for the advertising printing paper with the width of A 4 or more, the peripheral brightness is bright, and the middle dark unevenness occurs. Light distribution, when the cloth is glued, a bubble produces a sudden bright spot, and its advertising effect is obviously attenuated; furthermore, the light guide plate is easy to leave residual glue, which is extremely inconvenient for subsequent advertisement drawing replacement. Example 4 Recently, South Korea's Samsung Electronics (Samsung) introduced an ultra-thin LCD TV with 42" and 50" LED backlights. Its ultra-thin backlight module is designed with LED light source injected into the light guide plate from the end face, one of the light guide plates. A plurality of scattering points are arranged on the side, and the combination of the strips is distributed, and a uniform surface light source is scattered through the other side, which is a backlight for the transmissive LCD panel. After the launch of this ultra-thin TV, it was amazed by the market and recognized by consumers. However, the large-size LCD backlight module is a high-precision, high-priced product that is not easy to be used in the popular advertising billboard market. In order to achieve high uniformity of the surface light source characteristics, the fabrication process is to equate the optical professional and complex computer program simulation to design the surface characteristics of the light guide plate, such as the distribution characteristics of the light source, the scattering point, and the V-groove. It takes several months of effort to make corrections between design and production. Overall, the backlight type illumination has low light utilization efficiency, about 10 to 20%, and the uniformity of the large-sized surface light source is difficult. Control, high cost, size, shape can not meet the lively characteristics of advertising lighting.

Summary of the invention

The object of the present invention is to provide a positive light billboard device with high light utilization efficiency, low energy consumption, small occupied space and wide application range.

The object of the present invention is achieved by the following technical solutions: a light guide plate and a billboard, at least one end surface of the light guide plate is provided with a light source, and the light guide plate is connected to the surface of the billboard through a transparent bump. The light totally reflected in the light guide plate is guided to the front surface of the billboard through the transparent bump, and the position of the transparent bump is the discharge port of the light in the light guide plate.

The light source may be an LED light emitting diode, a laser diode or a CCFL cold cathode. The LED light emitting diode may be a conventional white light LED light emitting diode or a three-color red, green light or blue light LED light emitting diode simultaneously or sequentially. The light-emitting LED light-emitting diode group, the LED light-emitting diode group respectively emits a certain proportion of brightness of the red light, the green light, and the blue light, or outputs in a fast time sharing manner, and is put into the light guide plate, and the color light enters The visual effect of the eye forms a source of illumination for white light illumination.

The transparent bumps may be formed by dot printing, spraying, embossing, transfer, ultraviolet curing glue or mold molding.

The transparent bumps can be fabricated on the light guide plate or on the billboard.

The distribution of the transparent bumps, the dot pitch, and the height are determined according to the effect to be exhibited by the artist, and there is no particular limitation. l毫米至10毫米的范围内。 Generally, the distance between the dots of the transparent bumps may be between 0. lmm to 10mm The height of the transparent bumps can be between 50 μm and 1 mm.

The billboard may be a dot print, a digital electronic print, an electronic paper billboard or an LCD liquid crystal billboard.

The invention adopts transparent bumps to connect the light guide plate and the billboard in a gapless manner, and has no stray light such as reflection and refraction generated by the air gap in the light path, so that the visibility and contrast of the picture are better.

Since the transparent bumps can be formed on the surface of the billboard or the light guide plate by screen printing, spraying, digital printing, etc., the position can accurately correspond to the contents of the billboard, such as text lines. Among them, the transparent bump printing on the one-piece forming method of the advertising print is most easy to achieve the positional accuracy, and is not affected by the connection between the subsequent billboard and the light guide plate, so the description of the embodiment is convenient, but is not limited thereto. Due to the microscopic illumination of the transparent bumps, the viewer sees the picture consisting of most tiny colored highlights. The size, height and dot distance directly affect the comfort of the picture. Since the transparent bumps and the light guide plate and the surface of the billboard need to be connected by no gap, before the connection, the height of the transparent bumps should be at least 50 μηη deformation after the connection, such as pressing, or gluing, Can maintain its local light guiding function. According to the viewer's position of 10 meters, the appropriate point for viewing billboards should be within 10mm. Similarly, the distance between viewing billboards of 1 meter away should be within about 1mm. The current transparent glazing ink such as UV light-solid ink or epoxy resin output technology dot spacing of at least 100 dpi (dot per inch) is about 0.25 mm, so the ink glazing technology in the embodiment can cover close distance, such as 25 cm. The purpose of indoor billboards. In the future, the demand for electronic high-precision, higher-resolution billboards for positive lighting will be generated by the process of manufacturing the electronic billboard itself, so that the point source generated by the bump is precisely aligned with the opening of each pixel in the billboard. Bit Set, and as close as possible to the pixel layer, increase the optical aperture value, that is, the ratio of the opening area / distance, which can effectively increase the utilization of the light source.

In use, at least one directional light source is forwardly injected into at least one end surface of the light guide plate, and the remaining end surfaces of the light guide plate are covered with a reflective material to form an environment of ideal reflection light guiding. Taking the refractive index, n=1.55 acryl light-guiding material as an example (see Fig. 2), the light source projected from the end face has a projection angle of ±50 or less. The light satisfies the total reflection condition, and the acrylic The material is continuously reflected without interface loss and eventually fills the inside of the light guide. By using the transparent bumps produced by the dot printing to contact the surface of the light guide plate, the light can no longer be restricted by the total reflection condition, and will be partially leaked out through the transparent bumps according to the position set therein, that is, local precise positive illumination of the advertising drawings is generated. The function. Because the shape of each transparent bump is similar to the boundary condition, the brightness of the individual penetration leaks is high, the distance and orientation of the light source are small, and only the total number of transparent bumps set in one area is slow. Proportion, the optical simulation vector is calculated to be about the total amount of scalar relationship in the area, which greatly simplifies the problem of the spacing and distribution design of the conventional light guide plate, which is a major feature of the invention. The advertising designer does not need to have the knowledge of optics. Intuitively adjust the number of the dot, that is, the duty ratio of the black and white in the dot, to arrange the light distribution of the layout, so that the design, size and shape of the Zhengguang advertising billboard lighting are more flexible. Can be personalized, single. Each transparent bump, that is, the bright spot, is placed on the screen according to the needs of the advertisement designer, so that the position where the illumination of the screen occurs can be controlled without any waste. Through the contact of the transparent bumps with the surface of the light guide plate, the light directly reaches the surface of the advertising drawing or is close to the liquid crystal layer of the reflective LCD panel. Since there is no air gap, the reflected stray light can be minimized, and the black and white of the advertising pattern is The ratio produces a positive effect. Recently, the e-books on the market have been watched. The screens are made of flexible electronic paper. The viewing distance is about 20cm~40cm. The image is similar to the effect of the LCD panel. The lines and patterns are expressed in black and white contrast reflected by ambient light. Commercial appeals seek to be the mainstream of power saving. Due to the non-active illumination of electronic paper, the imaging particles themselves are opaque, and backlight illumination cannot be used. The ambient light is used to display the content, which is not applicable in dimly lit places. Therefore, the present invention is suitable for providing a positive light illumination method. In addition, the positive lighting is applied to the reflective panel to maintain a clear picture in strong sunlight, which can increase the practical use of e-books. The light source of illumination is better with full-band sunlight, and LED is a narrow-band monochromatic light source. Therefore, improving the color rendering of LED illumination has become an important indicator of the product. The traditional white LED is excited by the blue-band LED combined with the yellow fluorescent coating on the surface, and the white light effect is mixed with the light of the blue and yellow bands, but the red and green components are obviously low, and the color rendering index is about 70%. A new generation of LED-backlit TVs has used backlights of three primary colors, that is, the proportion of red, green and blue LEDs is combined to form a white light source, which has a color rendering of 90%, but is still limited by the color filter built into the LCD. Satisfaction. More advanced, such as the 3M CM200 LED projector's color correction method, and abandoned the idea of color filters, with the high color purity of the red, green and blue LED light source to directly illuminate, the color of a frame into a red The green, blue and blue groups of frames are quickly displayed to the audience, and the three sets of fast-displaying frames are restored to white light illumination under the visual persistence effect. The color saturation expression of this method can exceed the NTSC specification, color rendering. Up to 120%, the images that appear are a bit confusing, and have a good chance to become mainstream products. The above-mentioned color LED lighting can obviously cooperate with the positive light billboard method of the present invention, and can be applied to full color display of electronic paper and LCD panel, which can greatly enhance the future growth of the product. To make full use of the light and thin features of electronic paper products, the positive light guide plate needs to be relatively light and thin, how to make the light source more efficiently enter the light guide plate In the end face, the laser can be used as the side light. On the one hand, the laser can be easily focused to be injected into the lighter and lighter light guide plate from the end face, and the flexibility of the electronic book product is maintained, and the parallel light feature of the laser enables the flexible light guide plate. Can withstand greater curvature without leaking light at the corners.

The invention utilizes a combination of transparent bumps or dotted lines of different distributions (such as advertising content), density (such as brightness variation), size (such as regional light distribution), and can produce uniform, dense or text-like illumination unique effects. It can accurately match the design of advertising patterns and text content, avoiding residual light, exerting appropriate energy saving and viewing effects, and enhancing the added value of products. In the case of Zhengguang lighting advertising prints, its stray light is minimized, and light utilization efficiency is minimized. Can be easily increased to 60% of the total brightness; Small footprint; Wide range of applications, can meet the needs of advertising purposes, such as high brightness, various sizes, different shapes, local emphasis, etc.; .

If the billboard is replaced with another billboard, the invention can also be used as an indoor general lighting fixture such as a table lamp or a wall lamp.

DRAWINGS

1 is a schematic view showing the light of a linear light source coupled into a light guide plate;

2 is a schematic diagram of a total reflection angle and a transparent bump to derive light;

Figure 3 is a combination diagram of the light guide plate using bump distribution to illuminate the advertising content with partial positive light;

Figure 4 is a combination diagram of the light guide plate using a large area gradient change bump to compensate for a uniform positive light LCD billboard;

Figure 5 is a front view of the TFT LCD pixel aperture ratio; detailed description

The present invention will be further described below with reference to the accompanying drawings and embodiments.

Example 1

Referring to Figures 1, 2, and 3, the embodiment includes a linear light source 1 and a light guide plate 2. The light guide plate 2 is connected to the advertising sheet 6 through the surface of the transparent bump 5 without gaps; the total reflected light in the light guide plate 2 passes through the transparent bump 5 is directed to the front side of the advertisement drawing 6. The position of the transparent bump 5 is the discharge port of the light in the light guide plate 2. The distribution coating 7 of the transparent bump conforms to the content pattern of the advertisement drawing 6, and produces a localized emphasized lighting effect.

The distribution of the transparent bumps 5, the dot pitch, and the height are subject to change depending on the effect to be exhibited by the artist, and there is no particular limitation.

The light guide plate 2 - the end surface 31 is provided with a linear light source 1, and the remaining end surfaces 32 are covered with a reflective sticker 4; the linear light source 1 is formed by, but not limited to, a L E D light source.

The linear light source 1 couples light into the light guide plate 2 (see FIG. 1), and the reflective sticker 4 reflects the light back into the light guide plate 2 to improve the light utilization efficiency; after the LED light is reflected innumerable times, the total reflection angle is met. The light of the condition (see Fig. 2) is filled in the light guide plate 2 and cannot be separated, forming the necessary condition for uniform illumination of the present invention; the transparent bump 5 contacts the surface of the light guide plate 2, and the condition of total reflection optics changes, part The LED light will penetrate the contact transparent bump 5 and illuminate the object outside the light guide plate 2 (see Fig. 2), such as the advertising drawing 6. A plurality of minute transparent bumps 5 may be provided on the surface of the advertisement sheet 6 or the light guide plate 2 by the technique of screen printing. If the shapes and sizes of the respective transparent bumps 5 are similar, that is, their boundary conditions are similar, the light emission of the single transparent bumps 5 is very similar in the same region. The overall amount of illumination for the advertising drawings will be Converted into a simple scalar function relationship between large regions, without the need to simulate the complex optical program vector to obtain the illumination design of general uniformity, gradient grayscale change or color (see Figure 3). The illuminance required to design an advertising effect can be determined by setting the size (net number) and density (DPI) of a plurality of minute transparent bumps 5, which is a feature of the present invention. The invention utilizes the technique of screen printing to make an accurate pattern of 120 dpi bumps on the drawing, that is, the pitch of the light spots is 0.22 mm, which is much smaller than the size of the finished LED product in the industry, and the invention is in cost, manufacture, maintenance, and expression. It is clearly superior to the array of LED products; in addition, advertising printing inks also provide a richer color. The light inside the light guide plate 2 is completely guided to the front surface of the advertisement drawing 6 through the transparent bumps 5, and is conveyed to the viewer's eyes with a large number of light spot patterns and rich colors, wherein the light which is not derived from the transparent bumps 5 will be The light guide plate 2 is continuously reflected, so that the picture of the present invention is completely stray-free when viewed. Different density of screen printing design, producing uniform, grayscale and other different lighting effects, a low-cost advertising drawing 6, open source active lighting and non-active lighting have different effects, can express a dynamic appeal, for example, The company phone or slogan is printed on the white background with the transparent bump 5, and it is completely unknown under the external illumination; but when the night is dark, after the active illumination of the light source is turned on, the transparent bump 5 is turned into a bright spot. The white background is dark surface due to lack of light illumination. This dual dynamic effect is another major feature of the invention. In addition, it is easy to mass-produce, construct, and replace advertising and printing objects.

Example 2

Referring to FIG. 4, the embodiment includes a light guide plate 2 and a reflective LCD panel 10. The transparent bump coating 11 is a macroscopic representation of micro-transparent bumps printed on the light guide plate 2, and the center is densely and gradually becomes loose toward the periphery. Layer effect to compensate for laterally injected linear light Source 1, forming a uniform LED illuminator 20, and then positively contacting the reflective LCD panel 10 to form an LED illuminating LCD billboard 30.

The singularity of the edge of the light guide plate 2 is set to 0. 30mm, the distance between the points of the edge of the light guide plate 2 is set to 0. 30mm The transparent bump can compensate for the attenuation of the side light source according to a simple and slowly varying distribution, and obtain a uniform light illumination suitable for close reading.

Each of the end faces of the light guide plate 2 is provided with a linear light source 1; the linear light source 1 is formed by (but not limited to) L E D light sources.

The present invention utilizes a plurality of LED light sources (but is not limited thereto) to arrange the linear light source 1 and illuminate the light emitted therefrom into the end surface 3 of the light guide plate 2 (see FIG. 4), and the light is continuously reflected in the light guide plate 2, The light combined with the total reflection condition is filled in the light guide plate 2 and cannot penetrate to the outside. The distribution of the micro-transparent bumps is planned by the characteristics of the optical simulation light source, that is, the linear light source 1 and the light guide plate 2, to obtain a very uniform illumination distribution. For example, the distribution density of the transparent bumps from the central area to the edge area of the stencil 11 is decreased, or the number of dots is adjusted, that is, the duty ratio of black and white in the dot, and the dot output from the 1% to 100% duty ratio can be easily set. In order to compensate for the phenomenon that the light of the light source 1 is attenuated with distance due to partial absorption of the transparent bump.

The LED light source illuminates the reflective LCD panel 10 in a contact manner, so that all the light is injected into the reflective LCD panel 10 without leakage, so that the utilization efficiency of the light is improved, and the stray light is reduced; and the transparent bump 5 is forward-reflexed. In the liquid crystal layer in the LCD, the light will penetrate the liquid crystal layer for the first time and then pass through the liquid crystal layer for a second time before entering the viewer's eyes. Positive light illumination reflective LCD panel with light in and out On the path, all optical components will be in and out twice, such as liquid crystal layer, color filter surface, polarized layer, etc. The double shielding effect makes the LCD of the positive illumination than the backlight of the LCD, and its black and white contrast is improved. Square times.

Referring to FIG. 5, the present invention can be applied to improve the transmittance of the entire LCD panel. Only a part of the unit pixel 50 is specifically transparent, and is called a pixel opening 51. The rest is a back-moving signal line 52 and a black frame. The TFT driving component 53, wherein the pixel opening 51 is larger than the unit area of the pixel, and the aperture ratio is only about 60% to 70% in the aperture ratio of the high-resolution LCD, and the manufacturing technique of the micro lens (MICRO LENS) is as follows. UV curing glue with a mirror curvature baking process, a micro transparent bump 5 is formed on the surface of the LCD panel 10, and a micro transparent bump 5 is disposed on the pixel element opening 51. In a 1-1 mapping relationship with each pixel center of the LCD panel 10, the light in the light guide plate passes through the transparent bump 5, and the percentage of light entering the opening 51 can be greatly increased, thereby improving LCD pixel production. When the related circuit and the cover are accompanied by the covering problem, the luminous flux efficiency of the LCD can be improved. The technology of micro lens (MICRO LENS) has been widely used in CM0S and CCD sensor to increase the sensitivity of low light, but it is used in the illumination of positive light LCD or electronic paper. In addition to increasing the brightness, it can reduce the stray light and increase the contrast and reduce the light. The burden of vision when reading is extremely valuable for development.

If the transparent bump 5 and its contact surface are made of a polar material, the light that has not passed through the polarized material will be reflected back into the light guide plate 2 and continue to be recycled. The LCD panel will be more simplistic and efficient than existing backlights under the use of positive illumination.

Claims

Claim

A positive light billboard device, comprising: a light guide plate and an advertising plate, wherein at least one end surface of the light guide plate is provided with a light source, and the light guide plate has no gap contact with the surface of the billboard through the transparent bump The light that is totally reflected in the light guide plate is guided to the front surface of the billboard through the transparent bump, and the position of the transparent bump is the light leakage in the light guide plate.

□.

2. The positive light billboard device according to claim 1, wherein a pitch of the transparent bumps is between 0.1 mm and 10 mm.

3. The positive light billboard device according to claim 1, wherein the height of the transparent bump is between 50 μπι and 1 mm

4. The positive light billboard device according to claim 1, wherein the light source is an LED light emitting diode, a laser diode or a CCFL cold cathode tube.

The positive light billboard device according to claim 4, wherein the LED light emitting diode is a conventional white light LED light emitting diode or a three-color red light, green light or blue light LED light emitting diode simultaneously or sequentially. Illuminated LED light-emitting diode set.

The positive light billboard device according to claim 1 or 2, wherein the transparent bump is formed by dot printing, spraying, embossing, transfer, ultraviolet curing glue or mold molding.

The positive light billboard device according to claim 1 or 2, wherein the transparent bump is formed on a light guide plate or a billboard.

The positive light billboard device according to claim 1 or 2, wherein the billboard is a dot print, a digital electronic print, an electronic paper panel or an LCD liquid crystal panel.

The positive light billboard device according to claim 1 or 2, wherein the light guide plate has a flexible surface structure.

The positive light billboard device according to claim 3, wherein the light guide plate has a flexible surface structure.