JP2006344568A - Cold cathode fluorescent lamp for color liquid crystal panel - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent deterioration of phosphor luminescence due to discharge characteristics, luminous efficiency characteristics, life characteristics and local ununiformity of discharge electron beams, in relation to improvement of a commonly called backlight cold cathode fluorescent lamp installed in a back side of a color liquid crystal panel. <P>SOLUTION: In this cold cathode annular structure, due to discharge effects of both circular face discharge of curl parts and parallel discharge of crest parts, electron density is doubled, and discharge characteristics, luminance characteristics and life characteristics are improved. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

Detailed Description of the Invention

Industrial fields of electronics, machinery and video

      The present invention relates to an improvement of a so-called backlight cold cathode fluorescent lamp installed on the back side of a color liquid crystal panel, and it has been proposed that discharge characteristics, luminous efficiency characteristics, life characteristics, and phosphor emission deterioration due to local nonuniformity of the discharge element line. This is the content to prevent.

      FIG. 1 is a cross-sectional view of a cold cathode fluorescent lamp (10) as shown in FIG. The phosphor material (red, green, blue) (2) applied to the inner surface of the glass tube (1) is formed. The glass tube (1), the annular electrode (3), and the connecting line (4) are electrically connected by welding. The connection line is generally composed of a Kovar-based metal or glass-sealed metal-based jumet wire, and the Kovar-based system forms an oxide film by a selective oxidation furnace and is hermetically sealed with the glass tube (1). In the glass tube (1), inert (argon helium) (6) and a trace amount of mercury (Hg) (7) are enclosed. When a high voltage is applied to the annular electrode (3), discharge (5) is started. From the annular electrode (3), an electron beam (15a) is generated and excited by collision with atoms of the enclosed inert gas (6) to generate an ultraviolet (9) wavelength of 253.7 nm. This ultraviolet (9) is fluorescent. The body (2) emits light after being converted into a visible light range of emission colors (red, green, blue). The conventional annular electrode (3) is nickel metal and collides with mercury (Hg) (7) vapor, and the mercury amal gas gradually adheres to the annular electrode (3), resulting in a decrease in discharge characteristics. In addition, the amount of radiation of the electron beam (8) is reduced, and there is a drawback that the luminous efficiency is lowered. Furthermore, due to scratches, dents, and minute protrusions at the end of the annular electrode (3), non-uniform discharge (15) occurs from these local locations, and the phosphor (2) is burned. As a result, light emission characteristics and deterioration factors were caused. Further, the ring electrode (3) has a diameter (φ1.60 to φ2.70 mm) deep drawing and cylindrical press processing, so that minute scratches, paris, dents, etc. are not removed on the formed tip edge. The discharge at the edge locally received electrons (8) from the concentrated radiation on the phosphor (2) and burned slowly, resulting in deterioration of light emission characteristics, and lack of hindering light emission. The average life time of the cold cathode fluorescent lamp: 20,000. The present invention provides a cold cathode fluorescent lamp that solves the drawbacks as follows.

Contents of concrete color liquid crystal panel cold cathode fluorescent lamp

＊約３０（％）電圧消費電力削減
カラー液晶ＴＶの電力削減効果と寿命特性技術規格５０，０００（時間）を実証した。
図３ 本発明の冷陰極環状構体（３０）の具体例を示す。モリブデン金属系の一対をなす。環状周辺に沿うカール部（３１）と中空円筒に山形部（３２）３０°三角形を複数個以上形成する。
ニッケル金属系環状電極（３３）の外径とカール部（３１）の内径と圧入嵌合によって、溶接固定される。この冷陰極環状構体（３０）の電気的特性作用効果は，カール部（３１）は円面放電山形部（３２）は，平行放電を特徴として，ニッケル金属環体電極（３３）に水銀・アマルガムの付着と防止して，寿命特性の向上性を計ることが実証できた。
図４ 本発明のモリブデン系金属による，冷陰極電極の断面部分図で，カール部（１４ａ）と非球面部（１４ｂ）を一対で構成し，従来のニッケル金属系冷陰極（４３）の外径と端部が覆い被るように嵌合溶接固定される。冷陰極環状電極構体（４０）に、高電圧を印加すると，カール部（１４ａ）と非球面（１４ｂ）より電子線が放射状に発生し，管内放電が開始され，蛍光体が発光する。
本発明の冷陰極環状電極構体（４０）によって，ニッケル金属系の電極（４３）に水銀アマルガム付着防止と放電特性（電子密度大）発光能率向上の効果が実証された。This will be described with reference to FIG.
The present invention relates to a backlight installed on the back side of a color liquid crystal panel, that is, an invention of a cold cathode electrode assembly of a cold cathode fluorescent lamp (20). A fluorescent substance (red, green, blue) (12) is applied and formed inside the glass tube (11), and inert (16) and a small amount of mercury (Hg) (17) are formed inside the glass tube (11). Enclose. The cold cathode annular electrode assembly (13) of the present invention and the connection line (14) are welded and hermetically sealed at both ends of the glass tube (11). When a high voltage is applied to the annular electrode assembly (13), discharge (15) starts from the curled portion (13a) and the chevron portion (13b). The curled portion (13a) has a discharge (15) in which the glass tube (11) and the phosphor (12) are coaxial, and the entire region has a uniform directional discharge (15) and the cold cathode annular structure (13) has a hollow cylinder. Provided. In the embodiment of the chevron (13b), a plurality of 30 ° triangular pieces are provided and discharged (15) from the apex thereof with directivity parallel to the tube axis.
So-called electron beam (18a) and electron beam (18b) both collide with water active gas (16) and mercury (17) atoms and are excited to generate ultraviolet rays (19) having a wavelength of 253.7 nm, This ultraviolet light (19) is an applied principle that excites the phosphor (12) to emit light. The sum of both the electron beam (18a) and the electron beam (18b) increased the amount of electron density and increased the light emission efficiency. The effects were awaited in the discharge characteristics, luminance characteristics, and life characteristics. The relationship with voltage control is shown below because of the high electron density.
Relationship between electron density and voltage (table below)

* Approximately 30 (%) Voltage power consumption reduction The power reduction effect of color liquid crystal TV and the lifetime characteristic technical standard 50,000 (hours) were verified.
FIG. 3 shows a specific example of the cold cathode annular structure (30) of the present invention. Forms a pair of molybdenum metal. A plurality of angle portions (32) 30 ° triangles are formed on the curled portion (31) and the hollow cylinder along the annular periphery.
The outer diameter of the nickel metal-based annular electrode (33), the inner diameter of the curl portion (31), and press-fitting are fixed by welding. The electrical characteristics and effects of this cold cathode annular structure (30) are characterized by the fact that the curled part (31) is characterized by a circular discharge chevron (32) and a parallel discharge, and a nickel metal ring electrode (33) is connected with mercury amalgam. It was proved that the improvement of the life characteristics can be measured by preventing and adhering.
FIG. 4 is a cross-sectional partial view of a cold cathode electrode made of the molybdenum-based metal of the present invention, comprising a curled portion (14a) and an aspherical portion (14b) as a pair, and the outer diameter of a conventional nickel-metal cold cathode (43). And fitted and fixed so that the end covers. When a high voltage is applied to the cold cathode annular electrode assembly (40), an electron beam is generated radially from the curled portion (14a) and the aspherical surface (14b), discharge in the tube is started, and the phosphor emits light.
The cold cathode annular electrode assembly (40) of the present invention demonstrated the effect of preventing mercury amalgam from adhering to the nickel metal electrode (43) and improving the discharge characteristics (high electron density) and luminous efficiency.

The cross-sectional view of the conventional cold cathode fluorescent lamp. The cross section of the cold cathode fluorescent lamp of this invention. The cold cathode annular structure sectional view of the present invention. The molybdenum cold-cathode annular electrode circular structure of this invention, sectional drawing.

Explanation of symbols

(10) (20) Cold cathode fluorescent lamp (1) (11) Glass tube (2) (12) Phosphor (red, green, blue)
(3) (13) (33) Annular electrode (13a) (14a) (32) Curled part (13b) (14b) (32) Angle part, annular circular part (4) (14) Connecting wire (5) (15 ) Discharge (6) (16) Inert gas (7) (17) Mercury (8) (18) (18b) Electron beam (9) (19) Ultraviolet light (30) (40) Cold cathode annular structure, cold cathode annular Circular structure

Claims (1)

      In a cold cathode structure for a color liquid crystal panel, the present invention provides a cylindrical metal metal electrode (cylinder plate thickness: 0.10 to 0.20 mm) with a pair of molybdenum metal systems covering the ends, and a curled portion, substantially Designed to be a hollow cylinder with a diameter of 1/3 of the cylinder diameter (30 degree angle), the former, curl generates a uniform radial discharge electron beam perpendicular to the arc, and uniform luminance characteristics in the phosphor tube For color liquid crystal, which has improved discharge characteristics, luminous efficiency characteristics, and life characteristics by doubling electron density by means of obtaining and discharge electron beam parallel to the tube axis generated from the apex of the hollow cylindrical chevron Cold cathode lamp.

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