Flexible substrate for display panel and manufacturing method thereof
View Patent ↗A flexible substrate for a display panel and a manufacturing method thereof is disclosed. The flexible substrate may include a first film having a glass cloth located within a first heat-resistant resin, and a second film laminated on at least one side of the first film. The second film may include a second heat-resistant resin. The flexible substrate may further include an intermediate material between the first film and the second film. The intermediate material may be applied to an outer part of the first film and may adhere the first film to the second film.
1. A flexible substrate for a display panel comprises a film complex structure, comprising:
a first film having a glass cloth located within a first heat-resistant resin; and
a second film laminated on at least one side of the first film,
wherein the second film comprises a second heat-resistant resin and an ultrafine ceramic powder, and
the ultrafine ceramic powder has a refractive index that is within 0.01 of a refractive index of the second heat-resistant resin, has a particle size of less than about 200 nm, and has a coefficient of thermal expansion that is less than about 8 ppm/° C.
2. The flexible substrate of claim 1 , wherein the thickness of the second film is less than the thickness of the first film.
3. The flexible substrate of claim 1 , wherein the second heat-resistant resin comprises a resin selected from polysulfone, polyether, polyether imide, and polyarylate (PAR), wherein the second heat-resistant resin has more than 200° C. of glass transition temperature.
4. The flexible substrate of claim 1 , wherein the second film has a transmissivity of more than 85%, a haze of less than 4.6, and glass transition temperature greater than 160° C.
5. The flexible substrate of claim 1 , wherein a difference between the refractive index of the glass cloth and the refractive index of the first heat-resistant resin is less than 0.01.
6. The flexible substrate of claim 1 , wherein titanium dioxide (TiO 2 ) particles are dispersed and contained inside one or more of the first heat-resistant resin or the second heat-resistant resin.
7. The flexible substrate of claim 1 , wherein the flexible substrate for the display panel has a total thickness of about 30 μm to about 200 μm.
8. The flexible substrate of claim 1 , wherein the first heat-resistant resin comprises a resin selected from polysulfone, polyether, polyether imide, and polyarylate (PAR), wherein the first heat-resistant resin has more than 200° C. of glass transition temperature.
9. The flexible substrate of claim 8 , wherein the first heat-resistant resin and the second heat-resistant resin comprise the same type of resin.
10. The flexible substrate of claim 1 , further comprising an intermediate material between the first film and the second film, wherein the intermediate material is applied to an outer part of the first film, wherein the intermediate material adheres the first film to the second film.
11. The flexible substrate of claim 10 , wherein the first heat-resistant resin and the intermediate material comprises the same type of resin.
12. The flexible substrate of claim 10 , wherein the intermediate material has a thickness of about 0.5 μm to about 5 μm.