Shenzhen Enrich Electronics Co., Ltd

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Company News >> LCD liquid crystal development technology knowledge 20th,August,2018
                                    The twist angle of our STN-LCD is designed to be 240° (Δnd=0.82-0.85μm). For a 6μm box, the Δn of the liquid crystal is required to be 0.141-0.147.
   The liquid crystals preferred by our company are MLC-15600-000/100, 3J40100-000/100, 3J40200-000/100, 3J40300-000/100, 3J40400-000/100 series. 3.2. Selection of LCD main auxiliary materials 3.2.1. Orientation agent (PI)

1. Since TN, HTN and STN have different pretilt angles, the PI used is different. TN and HTN require a low pretilt angle (about 1°), and STN requires a high pretilt angle (about 5°).

2. Our company's preferred TN and HTN use PI as PI-300B. Our preferred STN uses PI for SE-150 (240° twist). 3.2.2. Frame glue
    Generally, a thermosetting epoxy adhesive having good bonding property and good sealing property is used as a frame adhesive. The preferred frame glue of our company is XN-5A (manufactured by Mitsui Chemicals, Inc., Japan). 3.2.3. Spacer

3. Spacer in the frame glue The spacers in the frame glue have two types: cylindrical and spherical. The cylindrical shape is generally a glass rod, and the spherical shape has two kinds of silicon (Si) balls and silk balls. The diameter of the spacer is d=the thickness of the box. For example, the 7μm box is made of 7μm diameter spacer. The preferred spacer of our company is the glass rod produced by Nippon Electric Glass Co., Ltd., the 6μm box is PF-61, and the 7μm box is PF-70. 8.6μm box for PF-93

4. Spacers in the box The boxes in the box are generally plastic balls. The hardness and elasticity of the plastic balls are slightly different due to the different parent materials used by different manufacturers. For example, Sekisui Chemical

   The parent material of the product is benzene resin, and the Hayakawa product is acrylic resin. In order to meet the needs of the market, various manufacturers have also introduced cheap plastic balls, mainly for TN products. The preferred plastic balls of our company are: L-11R 5.8 μm for 6 μm box STN, SP-20675 for 7 μm box HTN, SP-207, TN-807 for TN, and L-11t 8.6 μm for 8.6 μm box TN. 3.2.4. Transfer electrode
1. Transfer electrode has three options: silver paste + gold ball, carbon paste + gold ball and epoxy + gold ball. The size of the gold ball is about 10% larger than the size of the spacer in the frame.

2. Our company stipulates: 6μm box and 8.6μm box use silver paste + gold ball scheme, 7μm box selects carbon paste + gold ball scheme, and the narrow glass left outside the frame is too small to use epoxy + gold ball scheme.

3. Our company's preferred silver paste is XA-220Mv, carbon paste FC-403T, epoxy material is the same as frame material (XN-5A).

4. The preferred golden ball of our company is: 6μm box AU-2065, 7μm box AU-2075, 8.6μm box AU-2095. 3.2.5. Sealing adhesive

5. Sealing adhesive generally uses UV curing adhesive, which requires good bonding performance, good sealing performance, no interaction with liquid crystal, high temperature resistance, low temperature and good chemical solvent. Our company's preferred sealant is A-202 glue for Sekisui Chemical. 3.2.6. Pin (PIN)

6. The metal pin is one of the connection modes between the liquid crystal panel and the driving circuit. It requires a smooth appearance, sufficient elasticity of the chuck, sufficient hardness of the needle, sufficient bending strength between the chuck and the needle, and dense solder plating. Uniform, firm and easy to tin.

7. Our company's preferred pins are Jidong products and Gree products. 3.2.7. Sealing PIN glue

8. Generally, the PIN glue is sealed with UV curing glue, which requires the proper viscosity (10,000-12,000 mPas), good adhesion, low shrinkage, sufficient hardness, high temperature resistance, low temperature and thermal shock, rework It's easier.

9. Our preferred sealing PIN glue is 86A (general product) and ACP903015 (high reliability product).

10.LCD process material selection 3.3.1. Cleaning agent

11. The cleaning agent for LCD production includes glass cleaning agent, cleaning agent before Top/PI coating, and cleaning agent after LCD filling and sealing. The glass cleaning agent is generally strongly alkaline. The cleaning agent before Top/PI coating is generally weakly alkaline or neutral, and the cleaning agent after LCD filling and sealing is required to be neutral.

12. Our preferred glass cleaning agent is white cat washing powder + NaOH solution. The cleaning agent before Top/PI coating is sg-100 (alkaline), TFDW (neutral), and the cleaning agent after LCD sealing and sealing. It is YJ-2 (general product), Henkel P3-kaltfin20 (highly reliable product), ss-920. 3.3.2. Photoresist

13. The photoresist for LCD is generally a positive photoresist, and the safe solvent PGMEA is basically non-toxic.

14. Our company's preferred photoresists are Suzhou Ruihong RZJ-390PG-30, Shipley SRC300A.

15. developer, de-resist film

16. The developing solution and the stripping solution of the positive photoresist are alkaline solutions, and are classified into an organic alkali solution and an inorganic alkali solution. TN and STN generally use inorganic alkali solutions KOH and NaOH, which are cheaper than organic alkali solutions.

17. Our company selects KOH solution as the developing solution and NaOH solution as the removing solution. 3.3.4. PI thinner

18. Polyamic acid usually uses N-methylpyrrolidone (NMP) as a diluent. The preferred NMP of our company is Suzhou Ruihong. 3.3.5. Photomask mask (mask)

19. Lithographic masks are usually available in three types: chrome plates, latex plates, and film (referred to as film). TN-LCD is generally not too high because of the resolution requirements. It is more expensive to use a film type mask. However, the film is easily scratched, and for products with a large production volume, the chrome plate is more preferred and durable.

20. Our company prefers the film processed by Meijingwei Company. 3.3.6. PI Letterpress

21PI coated multi-purpose letterpress for selective printing, commonly known as letterpress printing, can be applied to the place where PI is required (the area inside the LCD frame) is coated with PI, and the place where the PI is not required (the area of ​​the LCD frame area and the area outside it) is not coated. PI. Our company prefers the letterpress processed by Meijingwei Company. 3.3.7. Insulation paste
    The fixed pattern displayed on the LCD without power is printed on the inner surface of the substrate by an insulating paste, commonly known as the inner silk screen. It can also be silk-printed on the outer surface of the substrate or on the polarizer, commonly known as the outer silk screen.

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