KR20120106309A - Manufacturing method for light guide panel of back light unit for advertising signboard device - Google Patents

Manufacturing method for light guide panel of back light unit for advertising signboard device Download PDF

Info

Publication number
KR20120106309A
KR20120106309A KR1020110024348A KR20110024348A KR20120106309A KR 20120106309 A KR20120106309 A KR 20120106309A KR 1020110024348 A KR1020110024348 A KR 1020110024348A KR 20110024348 A KR20110024348 A KR 20110024348A KR 20120106309 A KR20120106309 A KR 20120106309A
Authority
KR
South Korea
Prior art keywords
light guide
guide plate
printing
light
pattern
Prior art date
Application number
KR1020110024348A
Other languages
Korean (ko)
Inventor
김진해
Original Assignee
(주)켐리치
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by (주)켐리치 filed Critical (주)켐리치
Priority to KR1020110024348A priority Critical patent/KR20120106309A/en
Publication of KR20120106309A publication Critical patent/KR20120106309A/en

Links

Images

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F13/00—Common details of rotary presses or machines
    • B41F13/54—Auxiliary folding, cutting, collecting or depositing of sheets or webs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F23/00—Devices for treating the surfaces of sheets, webs, or other articles in connection with printing
    • B41F23/04—Devices for treating the surfaces of sheets, webs, or other articles in connection with printing by heat drying, by cooling, by applying powders
    • B41F23/0403—Drying webs
    • B41F23/0406—Drying webs by radiation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M3/00—Printing processes to produce particular kinds of printed work, e.g. patterns
    • B41M3/003—Printing processes to produce particular kinds of printed work, e.g. patterns on optical devices, e.g. lens elements; for the production of optical devices
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0033—Means for improving the coupling-out of light from the light guide
    • G02B6/0035—Means for improving the coupling-out of light from the light guide provided on the surface of the light guide or in the bulk of it
    • G02B6/0036—2-D arrangement of prisms, protrusions, indentations or roughened surfaces
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0065—Manufacturing aspects; Material aspects
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0066—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form characterised by the light source being coupled to the light guide
    • G02B6/0073—Light emitting diode [LED]
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F13/00—Illuminated signs; Luminous advertising
    • G09F13/20—Illuminated signs; Luminous advertising with luminescent surfaces or parts
    • G09F13/22—Illuminated signs; Luminous advertising with luminescent surfaces or parts electroluminescent
    • G09F2013/222—Illuminated signs; Luminous advertising with luminescent surfaces or parts electroluminescent with LEDs

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Manufacturing & Machinery (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Mechanical Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Planar Illumination Modules (AREA)

Abstract

PURPOSE: A manufacturing method for a light guide plate of a back light unit for an advertising sign is provided to reduce manufacturing costs and improve brightness by efficiently providing the light guide plate with a size which a customer wants to have. CONSTITUTION: One base plate for printing is prepared(S10). The base plate for printing integrally includes a print pattern of the light guide plate with a plurality of shapes. The print patterns are printed on a light guide plate member using dispersion ink(S20). A dot pattern formed on one side of the light guide plate member is dried(S30). The light guide plate member is cut into each pattern size according to the print pattern of the light guide plate with a plurality of shapes(S40). [Reference numerals] (S10) Base plate preparation step; (S20 ) Printing step; (S30 ) Drying step; (S40) Cutting step

Description

Manufacturing method for light guide panel of back light unit for advertising signboard device}

The present invention relates to a method for efficiently manufacturing a light guide plate of a light emitting diode light emitting unit used in an advertisement signage device.

In general, the advertisement signage device includes a light source installed inside the frame and an advertising film such as a live action film illuminated by the light source.

As a light source of an advertisement signage device widely used in the related art, a fluorescent lamp, a cold cathode fluorescent lamp (CCFL), and the like are used. In addition, fluorescent lamps and CCFLs, which are used as light sources of conventional advertisement signage devices, are all used as direct lighting for directly illuminating the live film from the rear surface of the live film.

Such a light source used in a conventional advertisement signage device has a short lifespan and thus causes color stains due to fading colors when used for a long time, and polluting the environment because fluorescent materials are used. In addition, the conventional advertising signage device has a problem that the thickness is so thick that the relatively large volume and the fluorescent lamp or CCFL used as an illumination source consumes too much power.

Recently, in order to solve the problem of the conventional advertisement signage device, there is a tendency to employ a light distribution unit (BLU) using a light emitting diode (LED) as an illumination source of the advertisement signage device.

As a result, LEDs used in light-emitting units (BLUs) for advertisement signage devices generally adopt a direct type method. However, in the direct type, a large amount of LEDs are used, so productivity is low, it is difficult to match luminance uniformity, and there is a limit in reducing the thickness of the device. Prior to the advertisement signage device, a liquid crystal (LCD) display device employing LEDs as a light distribution source has recently used a so-called edge type BLU having LEDs mounted on the side.

Adoption of LED as a BLU is also rarely used in advertising signage devices. 1 is a cross-sectional view of a conventional advertisement signage device employing LED as an edge type BLU. Referring to FIG. 1, the BLU 2 serves as a light source for illuminating the optical film 1 at the rear surface of the optical film 1. In the edge type BLU (2), the light guide panel (3, Light Guide Panel, LGP) installed on the rear side of the live action film plays a key role. LED 5 is installed on the side of the light guide plate 3. The light emitted from the LED 5, which is a point light source, is uniformly diffused through the light guide plate 3 to be scattered and diffused to become a surface light source, thereby illuminating the actual film 1. The rear side of the light guide plate 3 is provided with a reflector 4 for reflecting the scattered light toward the live-action film 1.

The light guide plate 3 is provided with a pattern for uniformly scattering and diffusing light incident from the LED 5. 2 schematically illustrates an enlarged surface of a conventional light guide plate. As shown in FIG. 2, a plurality of rectangular patterns in which a pattern for uniformly scattering and diffusing light incident from the LEDs 5 are carved into a V-shaped cross section are formed on a surface of the conventional light guide plate 3. have. Such a V-cut pattern is generally processed by a computer numerical control (CNC) router device. However, the CNC router device has a problem of low productivity because it takes a very long time to process such a plurality of fine patterns, and has a limitation that can be limited to a small quantity of various types. In addition, the light guide plate 3 having a V-cut pattern has a problem in that the variation occurs for each product due to the processing characteristics of the CNC router device, so that the quality is not uniform. In addition, the light guide plate 3 having a V-cut pattern has a relatively low luminance of BLU.

An object of the present invention is to solve the above problems, to improve the pattern and manufacturing method of the light guide plate used in the BLU of the advertising signboard device and to efficiently provide the light guide plate of various sizes desired by the consumer and at the same time significantly increase the manufacturing cost It is to provide a light guide plate manufacturing method of the light distribution unit for the advertisement signage device lowered.

In order to achieve the above object, a light guide plate manufacturing method of a light distribution unit for an advertisement signage device according to an embodiment of the present invention includes a printing disc preparation step of preparing one printing disc integrally provided with a plurality of light guide plate printing patterns;

A printing step of printing a printing pattern on the light guide plate member using a diffusion ink using the printing original plate;

A drying step of drying a dot pattern formed on one surface of the light guide plate member printed and formed in the printing step; And

And a cutting step of cutting the light guide plate member to the size of each pattern according to the plurality of types of light guide plate printing patterns after the drying step.

The thickness of the light guide plate member is preferably 1mm to 10mm.

The material of the light guide plate member is preferably any one of an acrylic resin, a polycarbonate resin, and glass. However, other materials may be adopted as long as the light transmittance can be used for optical purposes.

The drying method used in the drying step is preferably infrared drying, box oven drying, or ultraviolet drying method.

In order to achieve the above object, a light guide plate manufacturing method of a light distribution unit for an advertisement signage device according to another embodiment of the present invention includes a printing disc preparation step of preparing one printing disc integrally provided with a plurality of light guide plate printing patterns;

A light guide plate preparing step of preparing light guide plate members to match the sizes of the plurality of light guide plate printing patterns;

A printing step of printing a printing pattern on the light guide plate member with a diffusion ink using the printing original plate in a state where the light guide plate members are arranged to match the pattern of the printing plate; And

And a drying step of drying a dot pattern formed on one surface of the light guide plate member formed by printing in the printing step.

The light guide plate manufacturing method of the light distribution unit for an advertisement signage device according to the present invention can efficiently supply a light guide plate having a size that meets the needs of a consumer, as compared with the conventional method of manufacturing a light guide plate that forms a scattering and diffusion pattern by a V-cutting method. In addition, the luminance is improved, the manufacturing cost is reduced, and the productivity of the light guide plate is remarkably improved.

1 is a cross-sectional view of a conventional advertisement signage device employing LED as an edge type BLU.
FIG. 2 schematically shows an enlarged view of the surface of the light guide plate employed in the advertisement signage device shown in FIG. 1.
3 is a flowchart illustrating a light guide plate manufacturing method of a light distribution unit for an advertisement signage device according to a first embodiment of the present invention.
FIG. 4 is a schematic layout view of a pattern of a printing disc prepared in the printing disc preparation step shown in FIG. 3.
FIG. 5 is a diagram schematically showing a printing step shown in FIG. 3.
FIG. 6 is a diagram schematically showing a cutting step shown in FIG. 3.
7 is a flowchart illustrating a light guide plate manufacturing method of a light distribution unit for an advertisement signage device according to a second embodiment of the present invention.
FIG. 8 is a diagram schematically illustrating an arrangement of a printing plate and a light guide plate in the printing step of FIG. 3.
9 is a view showing a schematic view of a light guide plate manufactured according to the present invention.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

3 is a flowchart illustrating a light guide plate manufacturing method of a light distribution unit for an advertisement signage device according to a first embodiment of the present invention. FIG. 4 is a schematic layout view of a pattern of a printing disc prepared in the printing disc preparation step shown in FIG. 3. FIG. 5 is a diagram schematically showing a printing step shown in FIG. 3. FIG. 6 is a diagram schematically showing a cutting step shown in FIG. 3. 9 is a view showing a schematic view of a light guide plate manufactured according to the present invention.

3 to 6, a light guide plate manufacturing method (hereinafter, referred to as "light guide plate manufacturing method") of a light distribution unit for an advertisement signage device according to the first embodiment of the present invention includes a printing disc preparation step (S10), It includes a printing step (S20), a drying step (S30), a cutting step (S40).

In the printing disc preparation step (S10), a single printing disc 10 having a plurality of light guide plate printing patterns 20 is integrally provided. The printing disc 10 may be employed, for example, a silk screen mesh disc. The printing pattern 20 is generally formed as a circular or hexagonal hole. The printing pattern 20 forms a dot pattern protruding on one surface of the light guide plate member 30 in a printing step S20 to be described later. A characteristic of the printing original plate 10 prepared in the printing disc preparation step S10 is that various types of patterns are integrally provided in one printing original plate 10. The printing pattern 20 provided on the printing plate 10 may be varied according to market demand in order to supply various light guide plates suitable for the size of the advertisement signboard of the type desired by the consumer. For example, the size of one printing pattern may be determined as 1200 mm x 2400 mm, and the size of the other printing pattern may be determined as 1000 mm x 2400 mm or 800 mm x 2400 mm.

In the printing step (S20), the printing pattern 20 is printed on the light guide plate member 30 with a diffusion ink using the printing original plate 10. The printing pattern 20 printed in the printing step S20 is printed in a state in which a plurality of dots are arranged on one surface of the light guide plate member 30. In the arrangement of the dot pattern, a small number of dots are provided in a portion close to the LED light source, and a large number of dots are provided in a dot pattern far from the light source. The reason for changing the number of dots according to the distance from the light source is that the portion close to the light source has sufficient brightness even when a small amount of light is reflected due to the intensity of the light, but the portion far from the light source Because a large number of light is reflected from the pattern, the light intensity is weak and a large number of dots must be provided to reflect sufficient light. That is, considering that the luminance of the region having high dot density is high and the luminance of the region having low dot density is low, the placement density is low in the region where the light from the LED light source is well reached, The batch density can be configured high. On the other hand, in the case of the same arrangement density, since the luminance of the region where the large size dot is disposed is high and the luminance of the region where the small size dot is disposed is low, the dots of the small size are arranged in the region close to the LED light source, Larger dots may be arranged in an area far from the LED light source.

The dot pattern formed in the printing step S20 may be applied to a conventional printing method. Specifically, screen printing, offset printing, pad printing or the like may be used.

When the printing disc 10 is a silkscreen printing mesh disc, as shown in FIG. 5, the printing disc 10 is brought into close contact with the upper surface of the light guide plate member 30 and then diffused by means such as a roller. By pressing the ink at a uniform pressure, the pattern formed on the printing pattern 20 is formed to protrude on one surface of the light guide plate member 30. Since the diffusion ink used in the printing step (S20) may employ a known diffusion ink composition, a detailed description thereof will be omitted. The diffusion ink may employ, for example, a material known from Korean Patent No. 0943233 or UV.

The thickness t of the light guide plate member 30 is preferably 1 mm to 10 mm. When the thickness t of the light guide plate member 30 is less than 1 mm, there is a problem in that the luminance of the light guide plate 40 used for advertisement is not sufficiently secured. When the thickness t of the light guide plate member 30 is greater than 10 mm, the brightness of the light guide plate 40 used for advertisement is sufficiently guaranteed, but the manufacturing cost is too high, resulting in a low economic efficiency. It is preferable that the material of the light guide plate member 30 is any one of acrylic resin, polycarbonate, and glass. In this embodiment, an acrylic resin is used as the material of the light guide plate member 30.

The light guide plate member 30 is later divided into each light guide plate 40, and when light is incident on the light guide plate 40, the light causes total reflection on the upper and lower surfaces of the light guide plate 40. The total reflection here means reflection with 100% reflectance. Optically, when light travels from a dense medium to a small medium, total reflection occurs when light is incident at an angle greater than the critical angle. That is, when the light incident from the light source is incident on the light guide plate 40 is incident on the light guide plate 40 (a dense medium having a high refractive index) through the upper or lower surface of the light guide plate 40 into the air (a small medium having a small refractive index), the incident angle is a critical angle. Abnormalities will cause total reflection. In particular, such total reflection easily occurs as the difference in refractive index is large. Air has the lowest refractive index, making it easy to totally reflect any contact with any medium. The light in contact with the dots printed in the printing step (S20) is reflected by the surface of the light guide plate 40 facing the clay pattern by diffuse reflection without total reflection to illuminate the live-action film.

In the drying step (S30), the dot pattern formed on one surface of the light guide plate member 30 formed by printing in the printing step (S20) is dried. The drying method used in the drying step (S30) may be an infrared drying method (IR type), a box oven (Box Oven) or an ultraviolet drying method (UV type). After the drying step S30, various types of dot patterns are formed on the surface of the light guide plate member 30. The luminance may be adjusted by changing the interval between the dot patterns, and the luminance and the luminance uniformity may be adjusted by making the distance between the dot patterns constant and changing the size of the dot pattern.

In the cutting step (S40), after the drying step (S30), the light guide plate member 30 is cut to the size of each pattern according to the light guide plate printing pattern 20 of the plurality of forms to form the light guide plate 40. The cutting method used in the cutting step (S40) may employ a known cutting method. For example, in the cutting step (S40), as shown in Figure 6, it is possible to perform a cutting operation using a diamond-coated rotary cutting edge. After the cutting step (S40) may be accompanied by a mirror surface treatment process for smoothly cutting the cut surface of each light guide plate 40. The mirror processing process may be used, for example, a diamond tool or a cutting edge used for mirror processing. 9 shows schematically one of the light guide plates 40 manufactured by the above manufacturing method. The light guide plate shown in FIG. 9 may be cut and used to a smaller size by a consumer as needed.

Hereinafter, a second embodiment, which is a modification of the first embodiment, will be described.

7 is a flowchart illustrating a light guide plate manufacturing method of a light distribution unit for an advertisement signage device according to a second embodiment of the present invention. FIG. 8 is a diagram schematically illustrating an arrangement of a printing plate and a light guide plate in the printing step of FIG. 3. 9 is a view showing a schematic view of a light guide plate manufactured according to the present invention.

7 and 8, in the method of manufacturing a light guide plate according to the second embodiment of the present invention, the printing disc preparation step (S10) is the same in relation to the first embodiment. However, in the first embodiment, a plurality of patterns are printed on one large light guide plate member 30 in the printing step S20, and then a cutting process of cutting the patterns to the size of the patterns is performed. However, the second embodiment shown in FIG. 7 differs in that the light guide plate member 30 is cut in advance to the size of the pattern prepared in the printing original plate 10 before the printing step S20 is performed. That is, the light guide plate manufacturing method according to the second embodiment is different from the first embodiment in that the cutting operation is performed in advance before the printing step without undergoing the cutting step S40 in the printing step S20. That is, the light guide plate manufacturing method according to the second embodiment of the present invention includes a printing disc preparation step (S10) of preparing a single printing disc that is integrally provided with a plurality of light guide plate printing patterns; A light guide plate preparing step (S15) of preparing the light guide plate members to match the sizes of the plurality of light guide plate printing patterns; A printing step (S20) of printing a printing pattern on the light guide plate member with a diffusion ink using the printing original plate in a state in which the light guide plate members are arranged to match the pattern of the printing disc; And a drying step (S30) of drying a dot pattern formed on one surface of the light guide plate member formed by printing in the printing step.

As described above, the light guide plate manufacturing method according to the present invention has an effect of further improving the brightness of the light guide plate by forming a pattern for scattering and diffusion using a printing method without using V-cut processing, unlike a conventional light guide plate manufacturing method. . In addition, it is a key feature of the light guide plate manufacturing method according to the present invention and the most remarkable effect is that it is possible to efficiently provide a light guide plate of various sizes to easily configure a variety of advertising signage devices required by the consumer. That is, by preparing a plurality of printing patterns in one printing disc to manufacture a light guide plate of various sizes in one printing step, the seller or consumer can easily purchase a light guide plate of the desired size can be cut and used according to the application There is an advantage. This effect can significantly reduce the manufacturing cost in terms of producers, thereby improving productivity, and can easily provide a beneficial effect in terms of marketing because it can easily meet various needs of consumers.

The present invention has been described above with reference to preferred embodiments, but the present invention is not limited to the examples, and various forms of embodiments may be embodied without departing from the technical spirit of the present invention.

10: original disk for printing 20: pattern for printing
30 light guide plate member 40 light guide plate
S10: preparing the printing disc S15: preparing the light guide plate
S20: printing step S30: drying step
S40: cutting step

Claims (5)

A printing disc preparing step of preparing one printing disc including the plurality of light guide plate printing patterns integrated therein;
A printing step of printing a printing pattern on the light guide plate member using a diffusion ink using the printing original plate;
A drying step of drying a dot pattern formed on one surface of the light guide plate member printed and formed in the printing step; And
And a cutting step of cutting the light guide plate member to the size of each pattern according to the plurality of types of light guide plate printing patterns after the drying step. The method of claim 1,
The light guide plate manufacturing method of the light distribution unit for an advertisement signboard device, characterized in that the thickness of the light guide plate member is 1mm to 10mm. The method of claim 1,
The material of the light guide plate member is any one of acrylic resin, polycarbonate resin, glass, the light guide plate manufacturing method of the light distribution unit for an advertising signage device. The method of claim 1,
The drying method used in the drying step is a light guide plate manufacturing method of a light distribution unit for an advertisement signage device, characterized in that the infrared drying, box oven or ultraviolet drying. A printing disc preparing step of preparing one printing disc including the plurality of light guide plate printing patterns integrated therein;
A light guide plate preparing step of preparing light guide plate members to match the sizes of the plurality of light guide plate printing patterns;
A printing step of printing a printing pattern on the light guide plate member with a diffusion ink using the printing original plate in a state where the light guide plate members are arranged to match the pattern of the printing plate; And
And a drying step of drying a dot pattern formed on one surface of the light guide plate member formed by printing in the printing step.
KR1020110024348A 2011-03-18 2011-03-18 Manufacturing method for light guide panel of back light unit for advertising signboard device KR20120106309A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020110024348A KR20120106309A (en) 2011-03-18 2011-03-18 Manufacturing method for light guide panel of back light unit for advertising signboard device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020110024348A KR20120106309A (en) 2011-03-18 2011-03-18 Manufacturing method for light guide panel of back light unit for advertising signboard device

Publications (1)

Publication Number Publication Date
KR20120106309A true KR20120106309A (en) 2012-09-26

Family

ID=47113039

Family Applications (1)

Application Number Title Priority Date Filing Date
KR1020110024348A KR20120106309A (en) 2011-03-18 2011-03-18 Manufacturing method for light guide panel of back light unit for advertising signboard device

Country Status (1)

Country Link
KR (1) KR20120106309A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018016691A1 (en) * 2016-07-20 2018-01-25 (주)케이제이프리텍 Backlight unit and liquid crystal display apparatus including same, and backlight unit dimming method

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018016691A1 (en) * 2016-07-20 2018-01-25 (주)케이제이프리텍 Backlight unit and liquid crystal display apparatus including same, and backlight unit dimming method

Similar Documents

Publication Publication Date Title
KR100658951B1 (en) A back light unit having flexiblility for the key of the input devices
US7344292B2 (en) Edge-type backlight unit
US6854854B2 (en) Illumination system and display device
KR101484466B1 (en) Direct Type surface light source device for improved Luminescence and Uniformity
KR100639954B1 (en) A back light unit having flexibility for the key of the input devices
CN101201508B (en) Back-light unit and liquid crystal display having the same
US8419257B2 (en) Display apparatus and planar illumination apparatus
US8789997B2 (en) Light guide plate, surface light source device, and transmission image display device
CN102620193A (en) Sectional light emitting diode (LED) backlight module and liquid crystal display device
JPH11353920A (en) Multicolor light emitting surface light source unit
CN212229387U (en) Mini-LED backlight module and display device
CN101556000A (en) LED line light source and backlight source device
CN108267893B (en) A kind of no light guide plate bottom luminous backlight source
CN111624695A (en) Transparent glass light guide plate and manufacturing method thereof
JPH05210014A (en) Light transmission plate for liquid crystal back light and mold for molding the same
CN101441354A (en) LED line light source module group and backlight source device
JP2011090020A (en) Internal illumination type display plate
CN107085260A (en) The backing structure and LED of side entering type LED
KR20120106309A (en) Manufacturing method for light guide panel of back light unit for advertising signboard device
KR20200042167A (en) Direct Type surface light source device for improved Luminescence and Uniformity
KR101985148B1 (en) Direct Type surface light source device for improved Luminescence and Uniformity
KR20060086628A (en) Light control plate and liquid crystal display having the same
KR200446857Y1 (en) backlight assembly
KR101484480B1 (en) Direct Type surface light source device
KR20090119399A (en) Optical panel containing refelective minute beads for backlight

Legal Events

Date Code Title Description
A201 Request for examination
E902 Notification of reason for refusal
E701 Decision to grant or registration of patent right
NORF Unpaid initial registration fee