A T5 28W UVB fluorescent lamp for liquid crystal pre-alignment

Abstract

The present invention relates to the technical field of liquid crystal panel, in particular to a T5 28W UVB ultraviolet fluorescent lamp for liquid crystal pre-alignment. The lamp tube power of the ultraviolet fluorescent lamp is 28 ± 2.8W, the length of the finished lamp tube is 1148 ± 2mm, and the overall length is 1162 ± 2mm. Its glass tube is made of sodium potassium barium glass, and the specific components and mass fractions are as follows: SiO2 68.50 - 71.50%, Na2O 8.00 - 9.60%, Al2O3 1.40 - 2.00%, K2O 9.70 - 11.70%, SO3 0.03%, Cl 0.35 - 0.55%, BaO 7.40 - 9.00%, ZrO2 0.02%, SrO 0.10%, PbO 0.02%. The T5 28W UVB ultraviolet fluorescent lamp of the present invention can be used for liquid crystal pre-alignment, filling the blank of domestic similar products.

Description

Technical Field

[0001] The invention relates to the technical field of liquid crystal panels, and specifically relates to a T5 28W UVB ultraviolet fluorescent lamp used for liquid crystal pre-alignment. Background Art

[0002] Liquid crystal panel is the material that determines the brightness, contrast, color and viewing angle of the liquid crystal display. The alignment process is one of the key processes in the production of liquid crystal panels. The purpose of this process is to make the liquid crystal molecules form a certain inclination angle according to preset requirements.

[0003] At present, there are two main alignment processes for LCD panel production: friction alignment and photo alignment. Among them, photo alignment uses linear polarized ultraviolet light to irradiate a polymer alignment film with a photosensitive agent, so that the polymer has alignment ability. Its advantage is that it can avoid contamination of the glass substrate surface, and the parameters of the liquid crystal unit, such as pre-tilt angle, surface orientation strength, etc., can be controlled by the angle of the incident light and the length of the irradiation time.

[0004] In the domestic market, except for the UV fluorescent lamps developed and produced by the applicant company, other UV fluorescent lamps used in the liquid crystal pre-alignment process are manufactured by foreign manufacturers (such as Japan's Toshiba Company and South Korea's Unilamp Company). The key technology of UV fluorescent lamps lies in the glass tubes used in the production of UV fluorescent lamps, and foreign manufacturers have not disclosed their glass tube formulas.

[0005] The applicant disclosed a glass tube for a UVB ultraviolet fluorescent lamp and its application for the liquid crystal alignment process in CN202211513826.9. The glass tube for the UVB ultraviolet fluorescent lamp can produce a T12UVB ultraviolet fluorescent lamp suitable for liquid crystal light alignment. The outer diameter of the lamp tube is 38mm and the length is 2.4m (i.e., a T12 110W lamp tube), which is used in the alignment process of liquid crystal production. However, the pre-alignment process before the alignment process has completely different requirements for the spectrum and uses different lamp tubes. Therefore, the glass tube in this patent application cannot be used for T5 28W ultraviolet fluorescent lamps (lamp tube outer diameter 16mm).

[0006] Therefore, developing a T5 28W ultraviolet fluorescent lamp for use in a liquid crystal pre-alignment process in a liquid crystal photo-alignment process has become one of the technical problems that urgently need to be solved in this field. Summary of the invention

[0007] The object of the present invention is to provide a T5 28W UVB ultraviolet fluorescent lamp for liquid crystal pre-alignment.

[0008] To achieve the above object, the present invention provides the following technical solutions:

[0009] A T5 28W UVB ultraviolet fluorescent lamp for liquid crystal pre-alignment, wherein the glass tube of the ultraviolet fluorescent lamp is made of sodium potassium barium glass, wherein the components and mass fractions thereof are specifically: SiO2 68.50-71.50%, Na2O 8.00-9.60%, Al2O3 1.40-2.00%, K2O 9.70-11.70%, SO3 0.03%, Cl 0.35-0.55%, BaO 7.40-9.00%, ZrO2 0.02%, SrO 0.10%, and PbO 0.02%.

[0010] Preferably, the components and their mass fractions are: SiO2 70.00%, Na2O 8.78%, Al2O3 1.70%, K2O 10.70%, SO3 0.03%, Cl 0.45%, BaO 8.20%, ZrO2 0.02%, SrO 0.10%, and PbO 0.02%.

[0011] Among them, SO3 is the general expression method corresponding to the glass component S, and Cl is the expression method of the glass clarifier NaCl in the glass component.

[0012] In addition, according to the common component expressions in the glass industry, in addition to the above-mentioned expression method, the element content expression method can also be used. If the element content expression method is used, the components and mass fractions of the glass tube of the T5 28W UVB ultraviolet fluorescent lamp for liquid crystal pre-alignment of the present invention are specifically Si 32.02-33.42%, Na 5.92-7.10%, Al 0.74-1.06%, K 8.05-9.71%, S 0.01%, Cl 0.35-0.55%, Ba 6.62-8.06%, Zr 0.02%, Sr0.09%, Pb 0.02%, O 40.10-46.16%.

[0013] Preferably, the components and their mass fractions are Si 32.72%, Na 6.51%, Al 0.90%, K 8.88%, S 0.01%, Cl 0.45%, Ba 7.34%, Zr 0.02%, Sr 0.09%, Pb 0.02%, and O 43.06%.

[0014] Furthermore, the phosphor layer on the inner surface of the glass tube is coated with lanthanum cerium phosphate phosphor.

[0015] Furthermore, when working, the main output spectrum covers a wavelength range of 290nm to 380nm, and forms a peak at 313nm.

[0016] Furthermore, the diameter of the lamp tube is 16.0±1.5 mm, the length of the lamp tube of the finished lamp is 1148±2 mm, and the total length is 1162±2 mm.

[0017] Furthermore, the lamp current is 0.16A, the lamp voltage is 185±18V, the lamp power is 28±2.8W, and the UV illumination is >2.0mW / cm 2 .

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] The T5 28W UVB ultraviolet fluorescent lamp of the present invention is used for the pre-alignment process of the liquid crystal production process, belongs to the category of double-ended fluorescent lamps, and its purpose is that the ultraviolet light of the specific spectrum it outputs plays a pre-alignment function in the alignment process of the liquid crystal production process.

[0020] This product fills the gap of similar domestic products, solves the problem of no equivalent product supply in China, and achieves the same performance indicators as similar foreign products, that is, it has the same ultraviolet spectrum output, the same level of ultraviolet illumination and effective life. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is the ultraviolet characteristic spectrum of the T5 28W UVB ultraviolet fluorescent lamp of the present invention;

[0022] Figure 2 This is a schematic diagram of the product appearance of the T5 28W UVB ultraviolet fluorescent lamp of the present invention;

[0023] Figure 3 This is a schematic diagram of the structure of a T5 28W UVB ultraviolet fluorescent lamp of the present invention;

[0024] Figure 4 The ultraviolet characteristic spectrum of the comparative example T5 28W UVB ultraviolet fluorescent lamp.

[0025] Among them, 1-glass tube, 2-phosphor layer, 3-electrode, 4-electron, 5-mercury, 6-inert gas. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] Example

[0028] A T5 28W UVB ultraviolet fluorescent lamp for liquid crystal pre-alignment, wherein the glass tube is made of sodium potassium barium glass, wherein the components and mass fractions thereof are specifically SiO2 70.00%, Na2O 8.78%, Al2O3 1.70%, K2O 10.70%, SO3 0.03%, Cl 0.45%, BaO 8.20%, ZrO2 0.02%, SrO 0.10%, and PbO 0.02%.

[0029] This fluorescent lamp belongs to the double-ended fluorescent lamp, which is a T5 ultraviolet fluorescent lamp. Figure 2 As shown, the phosphor layer 2 on the inner surface of the glass tube 1 is coated with lanthanum cerium phosphate phosphor. The glass tube 1 is provided with an electrode 3, and is filled with mercury 5 and inert gas 6.

[0030] like Figure 3 As shown, the diameter D of the lamp tube is 16.0±1.5mm, the length A of the finished lamp tube is 1148±2mm (aluminum cap end-aluminum cap end), and the total length B is 1162±2mm (tube pin end-tube pin end).

[0031] When working, the main output spectrum covers the wavelength range of 290nm to 380nm, with a peak at 313nm. Figure 1 shown.

[0032] Nominal power is 28W, lamp current is 0.16A, lamp voltage is 185±18V, lamp power is 28±2.8W, UV illumination is >2.0mW / cm 2 The above parameters can be adjusted under specific requirements.

[0033] Ultraviolet illumination: Under standard test conditions (ambient temperature of 25±1℃, the lamp works continuously and stably for more than 10 minutes to reach a stable working state, and there is no convection wind), use USHIO illumination meter UIT-250 equipped with UVD-S313 probe to measure the ultraviolet illumination at the midpoint of the lamp and 30mm vertically away from the outer wall of the lamp. This is the ultraviolet illumination value at the peak of 313nm.

[0034] This product is used in the production process of photo-aligned liquid crystals. The designed lifespan requirement is: the illumination maintenance rate is 50% for the effective lifespan, and the effective lifespan requirement is 5000 hours.

[0035] Maintenance rate test data of the embodiment of the present invention:

[0036] Life time (hours) Illuminance maintenance rate 100 100％ 500 97.0％ 1000 85.6％ 2000 78.5％ 3000 74.1％ 4000 69.6％ 5000 65.9％

[0037] It can be seen from the above experimental results that the maintenance rate after 5000 hours is still significantly better than the requirement of 50%, which fully meets the design requirements.

[0038] In order to highlight the beneficial effects of the present invention, the following comparative example experiments of the research and development process of the present invention are cited.

[0039] Comparative Example

[0040] A T5 UVB ultraviolet fluorescent lamp for liquid crystal pre-alignment, wherein the components and mass fractions are specifically: SiO2 89.87%, CaO 0.09%, Na2O 5.35%, Al2O3 3.27%, K2O 0.77%, P2O5 0.02%, SO3 0.12%, Fe2O3 0.09%, TiO2 0.06%, Cl 0.25%, and ZrO2 0.11%.

[0041] The glass tube is used as the main component. In addition to the glass tube, the same lanthanum cerium phosphate phosphor and other supporting materials as in the embodiment are used, and the same manufacturing process is used to manufacture the T5 UVB ultraviolet fluorescent lamp. Its ultraviolet characteristic spectrum is as follows: Figure 4 , the average maintenance rate is tested as follows:

[0042] Life time Average maintenance rate 100 100.0％ 500 85.6％ 1000 78.2％ 2000 69.3％ 3000 55.8％ 4000 38.4％ 5000 -

[0043] It can be seen from the above experimental results that its actual effective lifespan is less than 4000 hours. At a lifespan of 4000 hours, its ultraviolet illumination maintenance rate is significantly lower than the design target set in the embodiment of the present invention, and the effective lifespan does not meet the designed requirement of 5000 hours.

[0044] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A T5 28W UVB ultraviolet fluorescent lamp for liquid crystal pre-alignment, characterized in that: The lamp tube power of the ultraviolet fluorescent lamp is 28±2.8W, the tube length of the finished lamp is 1148±2mm, and the total length is 1162±2mm; the glass tube of the ultraviolet fluorescent lamp is made of sodium potassium barium glass, wherein the components and mass fractions thereof are specifically: SiO2 70.00%, Na2O 8.78%, Al2O31.70%, K2O 10.70%, SO3 0.03%, Cl 0.45%, BaO 8.20%, ZrO2 0.02%, SrO 0.10%, and PbO 0.02%.

2. The T5 28W UVB ultraviolet fluorescent lamp for liquid crystal pre-alignment according to claim 1, characterized in that: The phosphor layer on the inner surface of the glass tube is coated with lanthanum cerium phosphate phosphor.

3. The T5 28W UVB ultraviolet fluorescent lamp for liquid crystal pre-alignment according to claim 2, characterized in that: When working, the main output spectrum covers the wavelength range of 290nm to 380nm, forming a peak at 313nm.

4. The T5 28W UVB ultraviolet fluorescent lamp for liquid crystal pre-alignment according to claim 3, characterized in that: The diameter of the lamp tube is 16.0±1.5mm.

5. The T5 28W UVB ultraviolet fluorescent lamp for liquid crystal pre-alignment according to claim 4, characterized in that: The lamp current is 0.16A, the lamp voltage is 185±18V, and the lamp UV illumination is >2.0mW / cm 2 .

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