WO2008078966A1 - Transparent electronic sign board - Google Patents

Transparent electronic sign board Download PDF

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Publication number
WO2008078966A1
WO2008078966A1 PCT/KR2007/006870 KR2007006870W WO2008078966A1 WO 2008078966 A1 WO2008078966 A1 WO 2008078966A1 KR 2007006870 W KR2007006870 W KR 2007006870W WO 2008078966 A1 WO2008078966 A1 WO 2008078966A1
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WO
WIPO (PCT)
Prior art keywords
electrode
region
transparent
value
resistance
Prior art date
Application number
PCT/KR2007/006870
Other languages
French (fr)
Inventor
Sung-Kyu Kim
Original Assignee
Sung-Kyu Kim
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 Sung-Kyu Kim filed Critical Sung-Kyu Kim
Publication of WO2008078966A1 publication Critical patent/WO2008078966A1/en

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Classifications

    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
    • G09F9/30—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements
    • G09F9/33—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements being semiconductor devices, e.g. diodes
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
    • G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B33/00—Electroluminescent light sources
    • H05B33/02—Details

Definitions

  • the present invention relates to a transparent electronic sign board, and more particularly to a transparent electronic sign board that is transparent and can display moving images and including each chip LED having uniform brightness on the same condition which same level of voltage is applied to each chip LED for the same time.
  • LEDs light emitting diodes
  • the conventional electrically-illuminated sign is disadvantageous because it is relatively thick. These signs must be thick to accommodate electric wiring and other elements required for implementing moving images. Specifically, since circuit boards for driving the LEDs are attatched directly on the back of the LED, conventional electrically-illuminated signs are thick.
  • No.0618943 disclose transparent electronic sign board that can dispaly moving images using chip LED consuming less electric power having long life span.
  • the Korean patents disclose transparent electrode is vapor depositted on a transparent board, circuit pattern for controlling on and off of the chip LED is made by surface division of the transparent electrode.
  • circuit pattern for controlling on and off of the chip LED is made by surface division of the transparent electrode, surface resistances of each transparent electrodes are different. Consequently light emitting from each chip LED consuming same electric power but located in different area has different brightness. Disclosure of Invention Technical Problem
  • the object of the present invention is to provide transparent electronic sign board that can display moving images and include chip LEDs each having same level of brightness on the same condition which same level of voltage is applied to each chip LED for the same time.
  • a transparent electronic sign board comprising: a first transparent board; a second transparent board being spaced apart from the first transparent board at a predetermined distance and facing the first transparent board; a transparent electrode vapor depositing to the surface of a first transparent board facing a second transparent board; an electrode division portion including a first electrode division portion deviding the transparent electrode in a first direction for forming electrically devided plural unit electrode regions, a second electrode division portion deviding each of the plural unit electrode regions in the first direction for forming a first electrode region and a second electrode region electrically devided from each other, and a third electrode division portion deviding the second electrode region from an area of the second electrode division portion to an edge area of the transparent electrode for forming plural third electrode regions electrically devided from each other; plural chip LEDs having a first electrode connected to the first electrode region and a second electrode connected to at least one among the third electrode regions, and being turned on
  • the chip LED includes LED being turned on and off according to existence of electric power supply through the first electrode region and the third electrode regions, protection resistance for protecting the LED, wherein the supplementary resistance being added while making resistance value of the protection resistance of each chip LED different.
  • a transparent electronic sign board comprising: a first transparent board; a second transparent board being spaced apart from the first transparent board at a predetermined distance and facing the first transparent board; a transparent electrode vapor depositing to the surface of a first transparent board facing a second transparent board; an electrode division portion including a first electrode division portion deviding the transparent electrode in a first direction for forming electrically devided plural unit electrode regions, a second electrode division portion deviding each of the plural unit electrode regions in the first direction for forming a first electrode region and a second electrode region electrically devided from each other, a third electrode division portion deviding the second electrode region in a second direction crossing the first direction for forming a first unit region and a second unit region electrically devided from each other; and a fourth electrode division portion deviding the first unit region and the second unit region from an area of the second electrode division portion to both edge area in both directions which are retreating from the third electrode division portion of
  • the chip LED includes LED being turned on and off according to existence of electric power supply through the first electrode region and the third electrode regions, protection resistance for protecting the LED, wherein the supplementary resistance being added while making resistance value of the protection resistance of each chip LED different.
  • the present invention provide transparent electronic sign board that can display moving images and include chip LEDs each having same level of brightness on the same condition which same level of voltage is applied to each chip LED for the same time.
  • FIG. 1 is perspective view of a transparent electronic sign board in accordance with the present invention.
  • Fig. 2 is sectional view sectioned through the II- II line of Fig. 1.
  • FIG. 3 is an embodiment of a circuit pattern formed on a first transparent board of the transparent electronic sign board in accordance with the present invention.
  • Fig. 4 is a equivalent circuit of a circuit pattern formed on a unit electrode region of the circuit pattern in Fig. 3.
  • FIG. 5 is another embodiment of circuit pattern formed on the first transparent board of the transparent electronic sign board in accordance with the present invention. Best Mode for Carrying Out the Invention
  • a transparent electronic sign board in accordance with the present invention comprises: a first transparent board; a second transparent board being spaced apart from the first transparent board at a predetermined distance and facing the first transparent board; a transparent electrode vapor depositing to a surface of the first transparent board facing the second transparent board; an electrode division portion including plural first electrode division portions deviding the transparent electrode in a first direction for forming electrically devided plural unit electrode regions, a second electrode division portion deviding each of the plural unit electrode regions in the first direction for forming a first electrode region and a second electrode region electrically devided from each other, and a third electrode division portion deviding the second electrode region from an area of the second electrode division portion to an edge area of the transparent electrode for forming plural third electrode regions electrically devided from each other; plural chip LEDs having a first electrode connected to the first electrode region and a second electrode connected to at least one among the plural third electrode regions, and being turned on and off according to existence of electric power supply through the first electrode region and the plural third electrode
  • the transparent electronic sign board 1 comprises plural chip LEDs 30, a first transparent board 10, a second transparent board 20, a transparent electrode 40, and a controller 90.
  • Chip LEDs 30 is used as a light source of the transparent electronic sign board 1 of the present invention, SMD(Surface Mount Device) type chip can be used as a embodiment. Therefore transparency of the transparent electronic sign board 1 is improved.
  • chip LEDs 30 of the transparent electronic sign board 1 of the present invention may be two pin single color LED. Full color display can be realized since Red LED, blue LED and Green LED form one picture element.
  • the present invention will be described based on a two pin chip LEDs 30 as one example of a chip LEDs 30 having anode electrode(hereafter referred as 'first electrode(31a)') and cathode electrode(hereafter referred as 'second electrode(31b)').
  • the first transparent board 10 is formed as a plate made of transparent materials, such as transparent glass, poly carbonate (PC), or acrylic.
  • transparent materials such as transparent glass, poly carbonate (PC), or acrylic.
  • PC poly carbonate
  • acrylic acrylic
  • the second transparent board 20 is shaped to correspond to the first transparent board 10, and also made of the same materials as the first transparent board 10.
  • the present invention is described based on the embodiment in which the first transparent board 10 and the second transparent board 20 are alike to each other, the skilled person in the art will easily appreciate that they do not have to be the same shape.
  • the first transparent board 10 and/or the second transparent board 20 are made of transparent glass materials
  • the first transparent board 10 and/or the second transparent board 20 may be made of half tempered glass materials.
  • a curving phenomenon which occurs when the first transparent board 10 and/or the second transparent board 20 are made of fully tempered glass materials is prevented.
  • the first transparent board 10 and/or the second transparent board 20 made of half tempered glass can minimize increase of resistance of transparent electrode 40 more than those made of fully tempered glass.
  • the transparent electrode 40 is formed as one of materials, such as indium tin oxide
  • ITO indium zinc oxide
  • IZO indium zinc oxide
  • the transparent electrode 40 is vapor deposited to the surface of a first transparent board 10 facing a second transparent board 20.
  • the transparent electrode 40 is electrically devided by electrode division portion 43 and forms a circuit pattern for controlling on and off of a chip LEDs 30.
  • Fig. 3 is an embodiment of a circuit pattern formed on a first transparent board 10 of the transparent electronic sign board 1 in accordance with the present invention.
  • the electrode division portion 43 include a first electrode division portion 43_1 , a second electrode division portion 43_2 and a third electrode division portion 43_3.
  • the first electrode division portion 43_1 devide the transparent electrode 40 in vertical direction for forming electrically devided plural unit electrode regions UAl, UA2, UA3 and UA4.
  • Three first electrode division portions 43_1 form four unit electrode regions UAl, UA2, UA3 and UA4 in Fig. 3.
  • the second electrode division portion 43_2 devides each unit electrode regions
  • each of the unit electrode regions UAl, UA2, UA3 and UA4 forms a first electrode region EAl and a second electrode region EA2 which are electrically devided from each other.
  • EA2 from an area of second electrode division portion 43_2 to an edge of the transparent electrode 40 located in the first direction that is a lower edge in Fig. 3 for forming plural third electrode regions EA3_a, EA3_b, EA3_c and EA3_d which are electrically devided from the first electrode region EAl and electrically devided from each other.
  • the third electrode division portion 43_3 devide the second electrode region EA2 from an area of the second electrode division portion 43_2 in '-
  • unit electrode regions UAl, UA2, UA3 and UA4 are electrically devided from each other and the first electrode region EAl is electrically devided from the plural third electrode regions EA3_a, EA3_b, EA3_c and EA3_d in the unit electrode regions UAl, UA2, UA3 and UA4.
  • the second electrode(31b) of each of the chip LEDs 30a, 30b, 30c and 30d is connected to third electrode regions EA3_a, EA3_b, EA3_c and EA3_d and the first electrode(31a) of each of the chip LEDs 30a, 30b, 30c and 30d is connected to the first electrode region EAl. Therefore on and off of corresponding one of the chip LEDs 30a, 30b, 30c and 30d is controlled by controlling on and off of the third electrode regions EA3_a, EA3_b, EA3_c and EA3_d while the state of the first electrode region EAl is 'on' in one of the unit electrode regions UAl, UA2, U A3 and UA4.
  • controller 90 controls on and off of the chip LEDs 30a, 30b, 30c and 30d provided in a unit electrode regions UAl, UA2, UA3 and UA4 of a first transparent board 10. And displaying moving images is realized by controlling on and off of plural chip LEDs 30a, 30b, 30c and 30d provided in a first transparent board 10.
  • transparent electronic sign board 1 in accordance with present invention enables displaying moving images by dot matrix structure in a plane formed by a single layer transparent electrode 40 and has decreased thickness and transparency.
  • Dot matrix structure in a plane is formed by making a first electrode region EAl and a third electrode regions EA3_a, EA3_b, EA3_c and EA3_d on a first transparent board 10 and attaching chip LEDs 30a, 30b, 30c and 30d on the first electrode region EAl and the third electrode region.
  • the transparent electronic sign board 1 in accordance with the present invention include supplementary resistance added to the chip LEDs 30a, 30b, 30c and 30d for compensating value difference between surface resistances RsI, Rs2, Rs3 and Rs4 of the first electrode region EAl and the second electrode region EA2 which provide electric power to each of the chip LEDs 30a, 30b, 30c and 30d.
  • the chip LEDs 30a, 30b, 30c and 30d in accordance with the present invention includes LED chip LED_1, LED_2, LED_3 and LED_4 which is turned on and off according to existence of electric power supply through the first electrode region EAl and the third electrode regions EA3_a, EA3_b, EA3_c and EA3_d and protection resistances RpI, Rp2, Rp3 and Rp4 for protecting the LED chip LED_1, LED_2, LED_3 and LED_4 from excessive voltage or excessive current.
  • Supplementary resistance can be added while making resistance value of the protection resistances RpI, Rp2, Rp3 and Rp4 of each chip LEDs 30a, 30b, 30c and 30ddifferent.
  • Fig. 4 shows a equivalent circuit of a circuit pattern formed on a unit electrode regions UAl, UA2, UA3 and UA4 of the circuit pattern in Fig. 3.
  • the chip LEDs 30a, 30b, 30c and 30d shown in Fig. 4 are located in one of the unit electrode regions UAl, UA2, UA3 and UA4.
  • RpI, Rp2, Rp3 and Rp4 are protection resistances RpI, Rp2, Rp3 and Rp4 corresponding to each LED chip.
  • RsI, Rs2, Rs3 and Rs4 are surface re- sistances values of the first electrode region EAl and the third electrode regions EA3_a, EA3_b, EA3_c and EA3_d which form circuit pattern for cotrolling on and off of each chip LEDs 30a, 30b, 30c and 30d when electric power is applied to each chip LEDs 30a, 30b, 30c and 30d.
  • Rp2 Rt-Rs2
  • Rp3 Rt-Rs3
  • LED_1, LED_2, LED_3 and LED_4 are acquired by measurement. Resistance value of each LED chip LED_1, LED_2, LED_3 and LED_4 can be equalized by determining each protection resistances RpI, Rp2, Rp3 and Rp4 value using measured surface resistances RsI, Rs2, Rs3 and Rs4 values.
  • Ra is variable which making Rt as positive number for simplifying caculation of Rp2, Rp3 and Rp4 or addition of resistance value or for compensating value difference of Rt for each unit electrode regions UAl, UA2, UA3 and UA4.
  • Ra is zero or natural number above zero.
  • the transparent electronic sign board 1 1 may further include filler 70 filled between the first transparent board 10 and the second transparent board 20.
  • the filler 70 protects the chip LEDs 30a, 30b, 30c and 30d against damage.
  • the filler 70 allows the first transparent board 10 and the second transparent board 20 to adhere to each other at a predetermined distance, which enable a use of glass material for transparent board.
  • the filler 70 according to the present invention is implemented by one of PVB film, EVA film, and liquid filler of a series of resins.
  • the chip LEDs 30a, 30b, 30c and 30d may be adhered to the transparent electrode 40 using the electro-conductive adhesive 80.
  • the present invention is described based on the electro-conductive adhesive 80 implemented by silver conductor or silver paste which is suitable for a screen print method.
  • the silver conductor or silver paste has a viscosity of 100 ⁇ 150kcps and a surface resistances RsI, Rs2, Rs3 and Rs4 of 50D/sq whose conditions make it adhere to glass well.
  • the present invention is described based on the embodiment where silver paste has a viscosity of 100 ⁇ 150kcps and a group of conductive epoxy bonds is used. Therefore, the filler 70 can maintain its adhesive force through a laminating process.
  • the transparent electronic sign board 1 1 may further include a non-electro-conductive adhesive 50 to adhere the chip LED 30.
  • the non-electro-conductive adhesive 50 adhere the bodies of the chip LEDs 30 to electrode division portion which is above of the transparent board 10.
  • such an adhering process of the non-electro-conductive adhesive can prevent the chip LEDs 30 from deviating from their positions due to a vibration or shake generated while the chip LEDs 30 are adhered to the transparent electrode 40 of the first transparent board 10, or, while the filler 70 is injected to the gap between the first transparent board 10 and the second transparent board 20.
  • the non-electro-conductive adhesive 50 serves to prevent the first electrode region EAl and the third electrode regions EA3_a, EA3_b, EA3_c and EA3_d from electrical connection, which is called an electrical short.
  • electrical connection is made as the electro-conductive adhesive 80 flows from a electrode region to another electrode region while the electro-conductive adhesive 80 adheres the first electrode and the second electrode 31a and 31b to the first electrode region EAl and the third electrode regions EA3_a, EA3_b, EA3_c and EA3_d, respectively.
  • the non-electro-conductive adhesive 50 is formed to be protruded from the surface of the first transparent board 10 more than those of the first electrode region EAl and/or the third electrode regions EA3_a, EA3_b, EA3_c and EA3_d, facing the chip LEDs 30.
  • Fig. 5 is another embodiment of circuit pattern formed on the first transparent board
  • electrode division portion 43 include first electrode division portion 43_la, second electrode division portion 43_2a, third electrode division portion 43_3a and fourth electrode division portion 43_4a.
  • the first electrode division portion 43_la devide the transparent electrode 40 in first direction for forming electrically devided plural unit electrode regions UAIa, UA2a, U A3 a and UA4a.
  • the second electrode division portion 43_2a devides each unit electrode regions
  • each unit electrode regions UAIa, UA2a, UA3a and UA4a forms a first electrode region EAIa and a second electrode region EA2a which are electrically devided.
  • the fourth electrode division portion 43_4a devides the first unit region and the second unit region from an area of second electrode division portion 43_2a to both edges in both directions which are retreating from the third electrode division portion 43_3a for forming plural third electrode regions EA3_aa, EA3_ba, EA3_ca and EA3_da which are electrically devided from the first electrode region EAIa and electrically devided from each other.
  • the fourth electrode division portion which devides the first unit region to plural third electrode regions EA3_aa, EA3_ba, EA3_ca and EA3_da devides the first unit region from an area of the second electrode division portion 43_2a in
  • the fourth electrode division portion which devides the second unit region to plural third electrode regions EA3_aa, EA3_ba, EA3_ca and EA3_da devides the second unit region from an area of the second electrode division portion 43_2a in ' ⁇ ' shape.
  • connection to the third electrode regions EA3_aa, EA3_ba, EA3_ca and EA3_da for electric power supply is made on edge areas of upper and lower portion of the first transparent board 10.
  • connection to the first electrode region EAIa for electric power supply is made on edge area of upper or lower portion of the first transparent board 10.
  • the present invention may be applied to a transparent electronic sign board, and more particularly to a transparent electronic sign board that is transparent and can display moving images and including each chip LED having uniform brightness on the same condition which same level of voltage is applied to each chip LED for the same time.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Computer Hardware Design (AREA)
  • Illuminated Signs And Luminous Advertising (AREA)
  • Devices For Indicating Variable Information By Combining Individual Elements (AREA)

Abstract

A transparent electronic sign board in accordance with the present invention comprises a first transparent board, a second transparent board, a transparent electrode and plural chip LEDs. Consequently a transparent electronic sign board in accordance with the present invention is transparent and can display moving images and including each chip LED having uniform brightness on the same condition which same level of voltage is applied to each chip LED for the same time.

Description

Description
TRANSPARENT ELECTRONIC SIGN BOARD
Technical Field
[1] The present invention relates to a transparent electronic sign board, and more particularly to a transparent electronic sign board that is transparent and can display moving images and including each chip LED having uniform brightness on the same condition which same level of voltage is applied to each chip LED for the same time. Background Art
[2] Electrically-illuminated signs which are installed to the outside of a house generally use light emitting diodes (LEDs) as their light sources. Since the LEDs are operated under relatively low power consumption and have a relatively long life span, they are applied to various electric sign boards, such as to large-sized electrically-illuminated signs installed to the exterior of a house, and to small-sized electrically-illuminated signs which are installed to the interior of a house.
[3] However, the conventional electrically-illuminated sign is disadvantageous because it is relatively thick. These signs must be thick to accommodate electric wiring and other elements required for implementing moving images. Specifically, since circuit boards for driving the LEDs are attatched directly on the back of the LED, conventional electrically-illuminated signs are thick.
[4] Also, since the back of conventional electrically-illuminated signs are generally covered to shield electric wires, the framework for the cover makes these signs thick, and fan must be installed for discharging heat generated inside of the signs and furthermore causes them to be unattractive.
[5] For solving the above described problem, Korean patent No.0618942 and
No.0618943 disclose transparent electronic sign board that can dispaly moving images using chip LED consuming less electric power having long life span.
[6] The Korean patents disclose transparent electrode is vapor depositted on a transparent board, circuit pattern for controlling on and off of the chip LED is made by surface division of the transparent electrode.
[7] However, since circuit pattern for controlling on and off of the chip LED is made by surface division of the transparent electrode, surface resistances of each transparent electrodes are different. Consequently light emitting from each chip LED consuming same electric power but located in different area has different brightness. Disclosure of Invention Technical Problem
[8] The object of the present invention is to provide transparent electronic sign board that can display moving images and include chip LEDs each having same level of brightness on the same condition which same level of voltage is applied to each chip LED for the same time. Technical Solution
[9] In accordance with an aspect of the present invention, the above and other objects can be accomplished by the provision of a transparent electronic sign board comprising: a first transparent board; a second transparent board being spaced apart from the first transparent board at a predetermined distance and facing the first transparent board; a transparent electrode vapor depositing to the surface of a first transparent board facing a second transparent board; an electrode division portion including a first electrode division portion deviding the transparent electrode in a first direction for forming electrically devided plural unit electrode regions, a second electrode division portion deviding each of the plural unit electrode regions in the first direction for forming a first electrode region and a second electrode region electrically devided from each other, and a third electrode division portion deviding the second electrode region from an area of the second electrode division portion to an edge area of the transparent electrode for forming plural third electrode regions electrically devided from each other; plural chip LEDs having a first electrode connected to the first electrode region and a second electrode connected to at least one among the third electrode regions, and being turned on and off according to existence of electric power supply through the first electrode region and the third electrode regions; a supplementary resistance added to each of the chip LED for compensating value difference of surface resistances among the first electrode region and the third electrode regions; and a controller selectively applying control signal to the first electrode region and the third electrode regions for selectively turning on and off of the plural chip LEDs.
[10] Here the chip LED includes LED being turned on and off according to existence of electric power supply through the first electrode region and the third electrode regions, protection resistance for protecting the LED, wherein the supplementary resistance being added while making resistance value of the protection resistance of each chip LED different.
[11] Also value of the protection resistance of each of the chip LEDs located on the unit electrode region is determined by a formula of Rpk=Rt-Rsk(here k=l,2,...n, 'n' is a number of the chip LED located on the unit electrode region, 'Rpk' is value of protection resistance of 'k'th chip LED, 'Rsk' is value of surface resistance of a region where 'k'th chip LED is located, Rt=Rp+Rs+Ra, Rp and Rs are a value of protection resistance of chip LED located in a region which has maximum value of surface resistance among the unit electrode region and a value of surface resistance of the region, and Ra≥O.)
[12] In accordance with another aspect of the present invention, there is provided a transparent electronic sign board comprising: a first transparent board; a second transparent board being spaced apart from the first transparent board at a predetermined distance and facing the first transparent board; a transparent electrode vapor depositing to the surface of a first transparent board facing a second transparent board; an electrode division portion including a first electrode division portion deviding the transparent electrode in a first direction for forming electrically devided plural unit electrode regions, a second electrode division portion deviding each of the plural unit electrode regions in the first direction for forming a first electrode region and a second electrode region electrically devided from each other, a third electrode division portion deviding the second electrode region in a second direction crossing the first direction for forming a first unit region and a second unit region electrically devided from each other; and a fourth electrode division portion deviding the first unit region and the second unit region from an area of the second electrode division portion to both edge area in both directions which are retreating from the third electrode division portion of the transparent electrode for forming plural third electrode regions electrically devided from each other; plural chip LEDs having a first electrode connected to the first electrode region and a second electrode connected to at least one among the third electrode regions, and being turned on and off according to existence of electric power supply through the first electrode region and the third electrode regions; a supplementary resistance added to each of the chip LED for compensating value difference of surface resistances among the first electrode region and the third electrode regions; and a controller selectively applying control signal to the first electrode region and the third electrode regions for selectively turning on and off of the plural chip LEDs.
[13] Here the chip LED includes LED being turned on and off according to existence of electric power supply through the first electrode region and the third electrode regions, protection resistance for protecting the LED, wherein the supplementary resistance being added while making resistance value of the protection resistance of each chip LED different.
[14] Also value of the protection resistance of each of the chip LEDs located on the first unit region is determined by a formula of Rpk=Rt-Rsk(here k=l,2,...n, 'n' is a number of the chip LED located on the first unit region, 'Rpk' is value of protection resistance of 'k'th chip LED, 'Rsk' is value of surface resistance of a region where 'k'th chip LED is located, Rt=Rp+Rs+Ra, Rp and Rs are a value of protection resistance of chip LED located in a region which has maximum value of surface resistance among the first unit region and a value of surface resistance of the region, and Ra≥O.)
Advantageous Effects
[15] The present invention provide transparent electronic sign board that can display moving images and include chip LEDs each having same level of brightness on the same condition which same level of voltage is applied to each chip LED for the same time. Brief Description of the Drawings
[16] Fig. 1 is perspective view of a transparent electronic sign board in accordance with the present invention.
[17] Fig. 2 is sectional view sectioned through the II- II line of Fig. 1.
[18] Fig. 3 is an embodiment of a circuit pattern formed on a first transparent board of the transparent electronic sign board in accordance with the present invention.
[19] Fig. 4 is a equivalent circuit of a circuit pattern formed on a unit electrode region of the circuit pattern in Fig. 3.
[20] Fig. 5 is another embodiment of circuit pattern formed on the first transparent board of the transparent electronic sign board in accordance with the present invention. Best Mode for Carrying Out the Invention
[21] A transparent electronic sign board in accordance with the present invention comprises: a first transparent board; a second transparent board being spaced apart from the first transparent board at a predetermined distance and facing the first transparent board; a transparent electrode vapor depositing to a surface of the first transparent board facing the second transparent board; an electrode division portion including plural first electrode division portions deviding the transparent electrode in a first direction for forming electrically devided plural unit electrode regions, a second electrode division portion deviding each of the plural unit electrode regions in the first direction for forming a first electrode region and a second electrode region electrically devided from each other, and a third electrode division portion deviding the second electrode region from an area of the second electrode division portion to an edge area of the transparent electrode for forming plural third electrode regions electrically devided from each other; plural chip LEDs having a first electrode connected to the first electrode region and a second electrode connected to at least one among the plural third electrode regions, and being turned on and off according to existence of electric power supply through the first electrode region and the plural third electrode regions; a supplementary resistance added to each of the chip LED for compensating value difference of surface resistances among the first electrode region and the third electrode regions; and a controller selectively applying control signal to the first electrode region and the third electrode regions for selectively turning on and off of the plural chip LEDs.
Mode for the Invention
[22] Now, preferred embodiments of the present invention will be described in detail with reference to the annexed drawings. The concept of the word, transparent, in the present application is not limited to materials through which light passes 100%, but instead is extended to materials which are transparent to the naked eye. Specifically, the word transparent in this application refers to a concept which includes a certain degree of transparency.
[23] As shown in FIG. 1 and FIG. 2, the transparent electronic sign board 1 comprises plural chip LEDs 30, a first transparent board 10, a second transparent board 20, a transparent electrode 40, and a controller 90.
[24] Chip LEDs 30 is used as a light source of the transparent electronic sign board 1 of the present invention, SMD(Surface Mount Device) type chip can be used as a embodiment. Therefore transparency of the transparent electronic sign board 1 is improved.
[25] Here, chip LEDs 30 of the transparent electronic sign board 1 of the present invention may be two pin single color LED. Full color display can be realized since Red LED, blue LED and Green LED form one picture element. Here, The present invention will be described based on a two pin chip LEDs 30 as one example of a chip LEDs 30 having anode electrode(hereafter referred as 'first electrode(31a)') and cathode electrode(hereafter referred as 'second electrode(31b)').
[26] Meanwhile, the first transparent board 10 is formed as a plate made of transparent materials, such as transparent glass, poly carbonate (PC), or acrylic. The present invention will be described based on an embodiment in which the first transparent board 10 is shaped as an approximately rectangular plate and made of glass materials.
[27] Similar to the first transparent board 10, the second transparent board 20 is shaped to correspond to the first transparent board 10, and also made of the same materials as the first transparent board 10. Although the present invention is described based on the embodiment in which the first transparent board 10 and the second transparent board 20 are alike to each other, the skilled person in the art will easily appreciate that they do not have to be the same shape.
[28] Here, in the case that the first transparent board 10 and/or the second transparent board 20 are made of transparent glass materials, the first transparent board 10 and/or the second transparent board 20 may be made of half tempered glass materials. Thus, it may be prevented that transparencies of the first transparent board 10 and/or the second transparent board 20 are decreased because of scratches, and that the first transparent board 10 and/or the second transparent board 20 are broken because of external impacts. Also, a curving phenomenon which occurs when the first transparent board 10 and/or the second transparent board 20 are made of fully tempered glass materials is prevented. Also, the first transparent board 10 and/or the second transparent board 20 made of half tempered glass can minimize increase of resistance of transparent electrode 40 more than those made of fully tempered glass.
[29] The transparent electrode 40 is formed as one of materials, such as indium tin oxide
(ITO), indium zinc oxide (IZO), liquid polymer, is coated to the first transparent board 10 by vapor deposition.
[30] The transparent electrode 40 is vapor deposited to the surface of a first transparent board 10 facing a second transparent board 20. Here, the transparent electrode 40 is electrically devided by electrode division portion 43 and forms a circuit pattern for controlling on and off of a chip LEDs 30.
[31] Fig. 3 is an embodiment of a circuit pattern formed on a first transparent board 10 of the transparent electronic sign board 1 in accordance with the present invention. As shown in Fig. 3, the electrode division portion 43 include a first electrode division portion 43_1 , a second electrode division portion 43_2 and a third electrode division portion 43_3.
[32] The first electrode division portion 43_1 devide the transparent electrode 40 in vertical direction for forming electrically devided plural unit electrode regions UAl, UA2, UA3 and UA4. For example Three first electrode division portions 43_1 form four unit electrode regions UAl, UA2, UA3 and UA4 in Fig. 3.
[33] The second electrode division portion 43_2 devides each unit electrode regions
UAl, UA2, UA3 and UA4 in first direction. So each of the unit electrode regions UAl, UA2, UA3 and UA4 forms a first electrode region EAl and a second electrode region EA2 which are electrically devided from each other.
[34] And the third electrode division portion 43_3 devides the second electrode region
EA2 from an area of second electrode division portion 43_2 to an edge of the transparent electrode 40 located in the first direction that is a lower edge in Fig. 3 for forming plural third electrode regions EA3_a, EA3_b, EA3_c and EA3_d which are electrically devided from the first electrode region EAl and electrically devided from each other.
[35] In the transparent electronic sign board 1 in accordance with the present invention, as shown in Fig. 3, the third electrode division portion 43_3 devide the second electrode region EA2 from an area of the second electrode division portion 43_2 in '-| ' shape as one example.
[36] Therefore unit electrode regions UAl, UA2, UA3 and UA4 are electrically devided from each other and the first electrode region EAl is electrically devided from the plural third electrode regions EA3_a, EA3_b, EA3_c and EA3_d in the unit electrode regions UAl, UA2, UA3 and UA4.
[37] Here the second electrode(31b) of each of the chip LEDs 30a, 30b, 30c and 30d is connected to third electrode regions EA3_a, EA3_b, EA3_c and EA3_d and the first electrode(31a) of each of the chip LEDs 30a, 30b, 30c and 30d is connected to the first electrode region EAl. Therefore on and off of corresponding one of the chip LEDs 30a, 30b, 30c and 30d is controlled by controlling on and off of the third electrode regions EA3_a, EA3_b, EA3_c and EA3_d while the state of the first electrode region EAl is 'on' in one of the unit electrode regions UAl, UA2, U A3 and UA4.
[38] Therefore controller 90 controls on and off of the chip LEDs 30a, 30b, 30c and 30d provided in a unit electrode regions UAl, UA2, UA3 and UA4 of a first transparent board 10. And displaying moving images is realized by controlling on and off of plural chip LEDs 30a, 30b, 30c and 30d provided in a first transparent board 10.
[39] In a conventional electronic sign boards, at least two layer or two pieces of PCBs were used, but transparent electronic sign board 1 in accordance with present invention enables displaying moving images by dot matrix structure in a plane formed by a single layer transparent electrode 40 and has decreased thickness and transparency. Dot matrix structure in a plane is formed by making a first electrode region EAl and a third electrode regions EA3_a, EA3_b, EA3_c and EA3_d on a first transparent board 10 and attaching chip LEDs 30a, 30b, 30c and 30d on the first electrode region EAl and the third electrode region.
[40] The transparent electronic sign board 1 in accordance with the present invention include supplementary resistance added to the chip LEDs 30a, 30b, 30c and 30d for compensating value difference between surface resistances RsI, Rs2, Rs3 and Rs4 of the first electrode region EAl and the second electrode region EA2 which provide electric power to each of the chip LEDs 30a, 30b, 30c and 30d.
[41] The chip LEDs 30a, 30b, 30c and 30d in accordance with the present invention includes LED chip LED_1, LED_2, LED_3 and LED_4 which is turned on and off according to existence of electric power supply through the first electrode region EAl and the third electrode regions EA3_a, EA3_b, EA3_c and EA3_d and protection resistances RpI, Rp2, Rp3 and Rp4 for protecting the LED chip LED_1, LED_2, LED_3 and LED_4 from excessive voltage or excessive current. Supplementary resistance can be added while making resistance value of the protection resistances RpI, Rp2, Rp3 and Rp4 of each chip LEDs 30a, 30b, 30c and 30ddifferent.
[42] Fig. 4 shows a equivalent circuit of a circuit pattern formed on a unit electrode regions UAl, UA2, UA3 and UA4 of the circuit pattern in Fig. 3. The chip LEDs 30a, 30b, 30c and 30d shown in Fig. 4 are located in one of the unit electrode regions UAl, UA2, UA3 and UA4. RpI, Rp2, Rp3 and Rp4 are protection resistances RpI, Rp2, Rp3 and Rp4 corresponding to each LED chip. RsI, Rs2, Rs3 and Rs4 are surface re- sistances values of the first electrode region EAl and the third electrode regions EA3_a, EA3_b, EA3_c and EA3_d which form circuit pattern for cotrolling on and off of each chip LEDs 30a, 30b, 30c and 30d when electric power is applied to each chip LEDs 30a, 30b, 30c and 30d.
[43] Here assuming that an arrangement of chip LEDs 30a, 30b, 30c and 30d located in one unit electrode regions UAl, UA2, UA3 and UA4 shown in Fig. 3 is same to an arrangement of chip LEDs 30a, 30b, 30c and 30d in Fig. 4, correlation among surface resitance values is described in the below [math figure I].
[44]
[45] MathFigure 1
Rsl >Rs2 >Rs3 >Rs4
[46]
[47] Here total resistance Rt of a LED chip LED_1 that RsI is applied is described in the below [math figure 2]. [48] MathFigure 2
Rt=Rpl+Rsl
[49]
[50] For equalizing resistance values of each LED chip LED_1, LED_2, LED_3 and
LED_4, resistance values of protection resistances Rp2, Rp3 and Rp4 which are added to other chip LEDs 30b, 30c and 30d is described in the below [math figure 3].
[51] MathFigure 3
Rp2=Rt-Rs2
[52]
Rp3 =Rt-Rs3 [53]
Rp3 =Rt-Rs3
[54]
[55] Here surface resistances RsI, Rs2, Rs3 and Rs4 values applied to each LED chip
LED_1, LED_2, LED_3 and LED_4 are acquired by measurement. Resistance value of each LED chip LED_1, LED_2, LED_3 and LED_4 can be equalized by determining each protection resistances RpI, Rp2, Rp3 and Rp4 value using measured surface resistances RsI, Rs2, Rs3 and Rs4 values.
[56] Therefore light of chip LEDs 30a, 30b, 30c and 30d have uniform brightness since each chip LEDs 30a, 30b, 30c and 30demits light of same brightness when applied electric power is same. The reason is that resistances applied to each chip LEDs 30a, 30b, 30c and 30d are same.
[57] Rt calculated by [math figure 2] is also calculated by the below [math figure 4].
[58] MathFigure 4
Rt=Rpl+Rsl+Ra
[59]
[60] Here Ra is variable which making Rt as positive number for simplifying caculation of Rp2, Rp3 and Rp4 or addition of resistance value or for compensating value difference of Rt for each unit electrode regions UAl, UA2, UA3 and UA4. And Ra is zero or natural number above zero.
[61] Referring to FIG. 2, the transparent electronic sign board 1 1 according to the present invention may further include filler 70 filled between the first transparent board 10 and the second transparent board 20. Here, the filler 70 protects the chip LEDs 30a, 30b, 30c and 30d against damage. Also, the filler 70 allows the first transparent board 10 and the second transparent board 20 to adhere to each other at a predetermined distance, which enable a use of glass material for transparent board. The filler 70 according to the present invention is implemented by one of PVB film, EVA film, and liquid filler of a series of resins.
[62] Also, in the present invention, the chip LEDs 30a, 30b, 30c and 30d may be adhered to the transparent electrode 40 using the electro-conductive adhesive 80. The present invention is described based on the electro-conductive adhesive 80 implemented by silver conductor or silver paste which is suitable for a screen print method. Preferably, the silver conductor or silver paste has a viscosity of 100~150kcps and a surface resistances RsI, Rs2, Rs3 and Rs4 of 50D/sq whose conditions make it adhere to glass well. The present invention is described based on the embodiment where silver paste has a viscosity of 100~150kcps and a group of conductive epoxy bonds is used. Therefore, the filler 70 can maintain its adhesive force through a laminating process.
[63] Additionally, the transparent electronic sign board 1 1 according to the present invention may further include a non-electro-conductive adhesive 50 to adhere the chip LED 30. The non-electro-conductive adhesive 50 adhere the bodies of the chip LEDs 30 to electrode division portion which is above of the transparent board 10. Specifically, such an adhering process of the non-electro-conductive adhesive can prevent the chip LEDs 30 from deviating from their positions due to a vibration or shake generated while the chip LEDs 30 are adhered to the transparent electrode 40 of the first transparent board 10, or, while the filler 70 is injected to the gap between the first transparent board 10 and the second transparent board 20.
[64] In addition, the non-electro-conductive adhesive 50 serves to prevent the first electrode region EAl and the third electrode regions EA3_a, EA3_b, EA3_c and EA3_d from electrical connection, which is called an electrical short. Such connection is made as the electro-conductive adhesive 80 flows from a electrode region to another electrode region while the electro-conductive adhesive 80 adheres the first electrode and the second electrode 31a and 31b to the first electrode region EAl and the third electrode regions EA3_a, EA3_b, EA3_c and EA3_d, respectively. To prevent such connection, the non-electro-conductive adhesive 50 is formed to be protruded from the surface of the first transparent board 10 more than those of the first electrode region EAl and/or the third electrode regions EA3_a, EA3_b, EA3_c and EA3_d, facing the chip LEDs 30.
[65] Fig. 5 is another embodiment of circuit pattern formed on the first transparent board
10 of the transparent electronic sign board 1 in accordance with the present invention. As shown in Fig. 5, electrode division portion 43 include first electrode division portion 43_la, second electrode division portion 43_2a, third electrode division portion 43_3a and fourth electrode division portion 43_4a.
[66] The first electrode division portion 43_la devide the transparent electrode 40 in first direction for forming electrically devided plural unit electrode regions UAIa, UA2a, U A3 a and UA4a. For example three first electrode division portions 43_la for m four unit electrode regions UAIa, UA2a, UA3a and UA4a in Fig. 5.
[67] The second electrode division portion 43_2a devides each unit electrode regions
UAIa, UA2a, UA3a and UA4a in first direction. So each unit electrode regions UAIa, UA2a, UA3a and UA4a forms a first electrode region EAIa and a second electrode region EA2a which are electrically devided.
[68] And the third electrode division portion 43_3a devides the second electrode region
EA2a in the second direction(horizontal direction in Fig. 5) which is crossing the first direction for forming first unit region and second unit region which are electrically devided from each other.
[69] And the fourth electrode division portion 43_4a devides the first unit region and the second unit region from an area of second electrode division portion 43_2a to both edges in both directions which are retreating from the third electrode division portion 43_3a for forming plural third electrode regions EA3_aa, EA3_ba, EA3_ca and EA3_da which are electrically devided from the first electrode region EAIa and electrically devided from each other.
[70] As shown in Fig. 5, the fourth electrode division portion which devides the first unit region to plural third electrode regions EA3_aa, EA3_ba, EA3_ca and EA3_da devides the first unit region from an area of the second electrode division portion 43_2a in |J ' shape. The fourth electrode division portion which devides the second unit region to plural third electrode regions EA3_aa, EA3_ba, EA3_ca and EA3_da devides the second unit region from an area of the second electrode division portion 43_2a in 'η ' shape.
[71] Consequently, connection to the third electrode regions EA3_aa, EA3_ba, EA3_ca and EA3_da for electric power supply is made on edge areas of upper and lower portion of the first transparent board 10. And connection to the first electrode region EAIa for electric power supply is made on edge area of upper or lower portion of the first transparent board 10.
[72] Here the method of determining value of supplementary resistance(supplement by the above described the protection resistance) which is added to each chip LEDs 30a, 30b, 30c and 30dis same as the method of determining value of protection resistances RpI, Rp2, Rp3 and Rp4 in the circuit pattern shown in Fig. 3 and Fig. 4.
[73] Although the preferred embodiments of the present invention have been disclosed for illustrative purposes, those skilled in the art will appreciate that various modifications, additions and substitutions are possible, without departing from the scope and spirit of the invention as disclosed in the accompanying claims. Industrial Applicability
[74] The present invention may be applied to a transparent electronic sign board, and more particularly to a transparent electronic sign board that is transparent and can display moving images and including each chip LED having uniform brightness on the same condition which same level of voltage is applied to each chip LED for the same time.

Claims

Claims
[1] A transparent electronic sign board comprising: a first transparent board; a second transparent board being spaced apart from the first transparent board at a predetermined distance and facing the first transparent board; a transparent electrode vapor depositing to a surface of the first transparent board facing the second transparent board; an electrode division portion including plural first electrode division portions deviding the transparent electrode in a first direction for forming electrically devided plural unit electrode regions, a second electrode division portion deviding each of the plural unit electrode regions in the first direction for forming a first electrode region and a second electrode region electrically devided from each other, and a third electrode division portion deviding the second electrode region from an area of the second electrode division portion to an edge area of the transparent electrode for forming plural third electrode regions electrically devided from each other; plural chip LEDs having a first electrode connected to the first electrode region and a second electrode connected to at least one among the plural third electrode regions, and being turned on and off according to existence of electric power supply through the first electrode region and the plural third electrode regions; a supplementary resistance added to each of the chip LED for compensating value difference of surface resistances among the first electrode region and the third electrode regions; and a controller selectively applying control signal to the first electrode region and the third electrode regions for selectively turning on and off of the plural chip LEDs.
[2] The transparent electronic sign board according to claim 1, each of the chip LEDs includes LED being turned on and off according to existence of electric power supply through the first electrode region and the third electrode regions and protection resistance for protecting the LED, wherein the supplementary resistance being added while making resistance value of the protection resistance of each of the chip LEDs different.
[3] The transparent electronic sign board according to claim 2, wherein the value of the protection resistance of each of the chip LEDs located on the unit electrode regions is determined by a formula of Rpk=Rt-Rsk(here k=l,2,...n, 'n' is a number of the chip LEDs located on the unit electrode regions, 'Rpk' is value of protection resistance of 'k'th chip LED, 'Rsk' is value of surface resistance of a region where 'k'th chip LED is located, Rt=Rp+Rs+Ra, Rp and Rs are a value of protection resistance of chip LED located in a region which has maximum value of surface resistance among the unit electrode regions and a value of surface resistance of the region, and Ra≥O.)
[4] A transparent electronic sign board comprising: a first transparent board; a second transparent board being spaced apart from the first transparent board at a predetermined distance and facing the first transparent board; a transparent electrode vapor depositing to a surface of the first transparent board facing the second transparent board; an electrode division portion including plural first electrode division portions deviding the transparent electrode in a first direction for forming electrically devided plural unit electrode regions, a second electrode division portion deviding each of the plural unit electrode regions in the first direction for forming a first electrode region and a second electrode region electrically devided from each other, a third electrode division portion deviding the second electrode region in a second direction crossing the first direction for forming a first unit region and a second unit region electrically devided from each other; and a fourth electrode division portion deviding the first unit region and the second unit region from an area of the second electrode division portion to both edge area in both directions which are retreating from the third electrode division portion of the transparent electrode for forming plural third electrode regions electrically devided from each other. plural chip LEDs having a first electrode connected to the first electrode region and a second electrode connected to at least one among the plural third electrode regions, and being turned on and off according to existence of electric power supply through the first electrode region and the plural third electrode regions; a supplementary resistance added to each of the chip LEDs for compensating value difference of surface resistances among the first electrode region and the third electrode regions; and a controller selectively applying control signal to the first electrode region and the third electrode regions for selectively turning on and off of the plural chip LEDs.
[5] The transparent electronic sign board according to claim 4, each of the chip LEDs includes LED being turned on and off according to existence of electric power supply through the first electrode region and the third electrode regions and protection resistance for protecting the LED, wherein the supplementary resistance being added while making resistance value of the protection resistance of each of the chip LEDs different.
[6] The transparent electronic sign board according to claim 5, wherein the value of the protection resistance of each of the chip LEDs located on the first unit region is determined by a formula of Rpk=Rt-Rsk(here k=l,2,...n, 'n' is a number of the chip LEDs located on the first unit region, 'Rpk' is value of protection resistance of 'k'th chip LED, 'Rsk' is value of surface resistance of a region where 'k'th chip LED is located, Rt=Rp+Rs+Ra, Rp and Rs are a value of protection resistance of chip LED located in a region which has maximum value of surface resistance among the first unit region and a value of surface resistance of the region, and Ra≥O.)
[7] The transparent electronic sign board according to claim 5, wherein the value of the protection resistance of each of the chip LEDs located on the second unit region is determined by a formula of Rpk=Rt-Rsk(here k=l,2,...n, 'n' is a number of the chip LEDs located on the second unit region, 'Rpk' is value of protection resistance of 'k'th chip LED, 'Rsk' is value of surface resistance of a region where 'k'th chip LED is located, Rt=Rp+Rs+Ra, Rp and Rs are a value of protection resistance of chip LED located in a region which has maximum value of surface resistance among the second unit region and a value of surface resistance of the region, and Ra≥O.)
PCT/KR2007/006870 2006-12-27 2007-12-27 Transparent electronic sign board WO2008078966A1 (en)

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