Glass tube for UVA fluorescent lamp used in liquid crystal alignment process and its application

Abstract

The invention relates to the technical field of liquid crystal panels, in particular to a glass tube for a UVA ultraviolet fluorescent lamp used in a liquid crystal alignment process and its application. The components and mass fractions of the glass tube for the UVA ultraviolet fluorescent lamp are specifically as follows: SiO2 86.938% to 92.938%, CaO 0.035%, Na2O 4.263% to 7.263%, Al2O3 2.433% to 4.433%, K2O 0.497% to 0.997%, P2O5 0.070%, SO3 0.060%, Fe2O3 0.064% to 0.144%, TiO2 0.071%, Cl 0.081% to 0.281%, ZrO2 0.094%, and ZnO 0.004%. The glass tube of the invention can produce a T12UVA ultraviolet fluorescent lamp suitable for liquid crystal light alignment, and the manufactured ultraviolet fluorescent lamp has better light decay characteristics and lifespan.

Description

Technical Field

[0001] The present invention relates to the technical field of liquid crystal panels, and in particular to a glass tube for a UVA ultraviolet fluorescent lamp used in a liquid crystal alignment process. 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 lamp developed and produced by the applicant company, other UV fluorescent lamps are manufactured by foreign manufacturers (such as Toshiba of Japan and Unilamp of South Korea). The key technology of UV fluorescent lamps lies in the glass tube used in the production of UV fluorescent lamps, but foreign manufacturers have not disclosed their glass tube formulas. Therefore, developing a glass tube that can be used for UVA ultraviolet fluorescent lamps has become one of the technical problems that need to be solved urgently in this field. Summary of the invention

[0005] The object of the present invention is to provide a glass tube for a UVA ultraviolet fluorescent lamp used in a liquid crystal alignment process and an application thereof.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] A glass tube for a UVA fluorescent lamp used in a liquid crystal alignment process, wherein the components and mass fractions thereof are specifically as follows: SiO2 86.938%-92.938%, CaO 0.035%, Na2O 4.263%-7.263%, Al2O3 2.433%-4.433%, K2O0.497%-0.997%, P2O5 0.070%, SO3 0.060%, Fe2O3 0.064%-0.144%, TiO2 0.071%, Cl 0.081%-0.281%, ZrO2 0.094%, and ZnO 0.004%.

[0008] Preferably, the components and their mass fractions are: SiO2 89.938%, CaO 0.035%, Na2O5.263%, Al2O3 3.433%, K2O 0.747%, P2O5 0.070%, SO3 0.060%, Fe2O3 0.104%, TiO2 0.071%, Cl 0.181%, ZrO2 0.094%, and ZnO 0.004%.

[0009] 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.

[0010] In addition, according to the common component expressions in the glass industry, in addition to the above expression method, the element content expression method can also be used. If the element content expression method is used, the glass tube for UVA ultraviolet fluorescent lamps used in the liquid crystal alignment process of the present invention, wherein the components and mass fractions are specifically, Si 39.043-45.043%, Ca 0.025%, Na 2.906-5.648%, Al 1.217-2.417%, K 0.420-0.820%, P 0.030%, S 0.024%, Fe 0.073%, Ti 0.043%, Cl 0.081-0.281%, Zr 0.070%, Zn 0.003%, O 48.165-54.423%.

[0011] Preferably, the components and their mass fractions are Si 42.043%, Ca 0.025%, Na 3.906%, Al 1.817%, K 0.620%, P 0.030%, S 0.024%, Fe 0.073%, Ti 0.043%, Cl 0.181%, Zr 0.070%, Zn 0.003%, and O 51.165%.

[0012] The glass tube for UVA ultraviolet fluorescent lamp of the present invention can be used to produce ultraviolet fluorescent lamps for light alignment.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] (1) The present invention adopts a completely different research and development concept from the existing international T12 UVA ultraviolet fluorescent lamp glass tube, and develops a glass tube formula for UVA ultraviolet fluorescent lamps with a high silica content. The quality of the T12 UVA ultraviolet fluorescent lamps manufactured with this glass tube fully meets the international level and can be mass-produced and applied.

[0015] (2) The glass tube formula of the present invention has a high SiO2 content and a significant characteristic of a high softening temperature, so a higher temperature can be used in the relevant thermal processing technology for the production of ultraviolet fluorescent lamps, and the produced ultraviolet fluorescent lamps have better light decay characteristics and lifespan. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 The characteristic spectrum of the glass made of the same components as the glass tube in the embodiment and the cerium yttrium phosphate phosphor, wherein the horizontal axis is the wavelength (in nm) and the vertical axis is the spectral power distribution;

[0017] Figure 2 The ultraviolet characteristic spectrum of the fluorescent lamp made of the glass tube of the embodiment;

[0018] Figure 3 The characteristic spectrum of the glass made of the same components as the glass tube of Comparative Example 1 and the cerium yttrium phosphate phosphor, wherein the horizontal axis is the wavelength (in nm) and the vertical axis is the spectral power distribution;

[0019] Figure 4 This is the characteristic spectrum of the glass made of the same components as the glass tube in Comparative Example 2 combined with the yttrium cerium phosphate phosphor, wherein the horizontal axis is the wavelength (in nm) and the vertical axis is the spectral power distribution. DETAILED DESCRIPTION

[0020] 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.

[0021] Example

[0022] A glass tube for a UVA fluorescent lamp used in a liquid crystal alignment process, wherein the components and mass fractions thereof are specifically as follows: SiO2 89.938%, CaO 0.035%, Na2O 5.263%, Al2O3 3.433%, K2O 0.747%, P2O5 0.070%, SO3 0.060%, Fe2O3 0.104%, TiO2 0.071%, Cl 0.181%, ZrO2 0.094%, and ZnO 0.004%.

[0023] Application Examples

[0024] The glass tube performance of the embodiment was tested:

[0025] When glass made of the same components as the glass tube in the embodiment is used with yttrium cerium phosphate phosphor, and the phosphor is excited by 254nm ultraviolet light to perform ultraviolet characteristic spectrum test (glass is used as a bottom plate, the phosphor is evenly spread on it, and then placed in a spectrum tester, and the spectrum tester automatically excites with 254nm ultraviolet light to test the ultraviolet spectrum after passing through the glass), in the range of 260nm to 500nm, its spectral characteristics are as follows Figure 1 As shown. Figure 1 The results show that: (1) the spectrum range of ultraviolet transmission is about 300nm ~ 400nm; (2) there are two obvious ultraviolet transmission peak points, respectively at 333nm and 353nm; (3) after calculation, the ultraviolet transmission ratio of 333nm and 353nm is about 82%. It can be seen that the glass tube component of the present invention can fully meet the production requirements of T12 UVA ultraviolet fluorescent lamps for liquid crystal light alignment.

[0026] Application Example 2

[0027] A T12 glass tube is drawn according to the proportion of the components in the embodiment, and the rare earth cerium yttrium phosphate phosphor is added to make a T12 UVA ultraviolet fluorescent lamp according to the fluorescent lamp production process. The ultraviolet spectrum is as follows Figure 2 As shown. The ultraviolet fluorescent light under this spectrum perfectly matches the characteristics of the liquid crystal alignment film, making the liquid crystal form a pre-tilt angle and achieving the alignment effect.

[0028] The lifespan of the 110W UVA lamp produced by the glass tube of the embodiment is compared with the lifespan of similar products of Toshiba Company, and the calculation is performed according to the calculation method of the lifespan of fluorescent lamps, with 100 hours of data as the benchmark. The results are shown in Table 1.

[0029] Table 1 Comparison of light decay between the lamps in the example and similar foreign products

[0030]

[0031] It can be seen from the above results that the glass tube of the present invention is made into a T12 UVA fluorescent lamp, and its life span has a great advantage under the same lighting conditions.

[0032] In order to highlight the beneficial effects of the present invention, the following comparative examples of the research and development process of the present invention are cited.

[0033] Comparative Example 1

[0034] A glass tube for a UVA fluorescent lamp, wherein the components and mass fractions are specifically: SiO2 70.023%, CaO 5.815%, Na2O 18.195%, MgO 2.717%, Al2O3 1.776%, K2O 0.639%, P2O5 0.030%, SO3 0.320%, Fe2O3 0.166%, TiO2 0.040%, CeO2 0.072%, PbO 0.011%, Cl 0.08%, BaO 0.018%, ZrO2 0.058%, SrO 0.022%, Y2O3 0.004%, Rb2O 0.003%, and NiO 0.011%.

[0035] When the glass made of the same components as the glass tube in Comparative Example 1 is used with yttrium cerium phosphate phosphor, and the phosphor is excited by 254nm ultraviolet light to conduct ultraviolet transmission characteristic spectrum test, the spectral characteristics in the range of 260nm to 500nm are as follows: Figure 3 As shown. Figure 3 The results show that the two peaks appear at 337nm and 354nm, which are slightly narrower than the design. However, the transmittance ratio of the two peaks is 60%, which results in a smaller effective ultraviolet region. Therefore, the performance of the T12UVA fluorescent lamp made with this glass tube will not meet the design requirements.

[0036] Comparative Example 2

[0037] A glass tube for a UVA fluorescent lamp, wherein the components and mass fractions are specifically: SiO2 70.058%, CaO 5.22%, Na2O 17.960%, MgO 2.733%, Al2O3 2.278%, K2O 0.894%, P2O5 0.027%, SO3 0.295%, Fe2O3 0.176%, TiO2 0.043%, CeO2 0.149%, Cl 0.093%, BaO 0.013%, ZrO2 0.020%, SrO 0.029%, Y2O3 0.009%, and Rb2O 0.003%.

[0038] When the glass made of the same components as the glass tube in Comparative Example 2 is used with yttrium cerium phosphate phosphor, and the phosphor is excited by 254nm ultraviolet light to conduct ultraviolet transmission characteristic spectrum test, the spectral characteristics in the range of 260nm to 500nm are as follows: Figure 4 As shown. Figure 3 The results show that the two peaks appear at 337nm and 354nm, which are slightly narrower than the design, and the ratio of the two peak transmittances is 56%, which is similar to the control group 1, and also leads to a smaller effective ultraviolet region. Therefore, the performance of the T12 UVA fluorescent lamp made with this glass tube will not meet the design requirements.

[0039] 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 glass tube for a UVA fluorescent lamp used in a liquid crystal alignment process, characterized in that: The components and their mass fractions are: SiO2 89.938%, CaO 0.035%, Na2O 5.263%, Al2O3 3.433%, K2O 0.747%, P2O50.070%, SO3 0.060%, Fe2O3 0.104%, TiO2 0.071%, Cl 0.181%, ZrO2 0.094%, and ZnO0.004%.

2. Use of the glass tube for UVA fluorescent lamp according to claim 1 in the production of ultraviolet fluorescent lamps for photo-alignment.

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