Liquid crystal panel
View Patent ↗To minimize color difference during white display, and secure high transmittance in liquid crystal panel driven by FFS mode or the like. Liquid crystal panel 10 has first substrate AR and second substrate CF oppositely arranged, and liquid crystal layer LC interposed between the first and the second substrates, wherein the first substrate has plural signal lines 18 and scanning lines 15 formed in matrix, upper electrode 24 having plural slit-shaped openings 25 divided by the scanning and signal lines, and formed for every sub-pixel, and lower electrode 21 formed with the upper electrode through insulating layer 23 , the second substrate has light-shielding layer 28 superimposed with the signal and scanning lines in planar view, and color filter layer 29 formed for every sub-pixel, and the liquid crystal layer includes a mixture of at least one compound having negative dielectric anisotropy and at least one compound having positive dielectric anisotropy.
1. A liquid crystal panel having a first substrate and a second substrate that are oppositely arranged, and a liquid crystal layer interposed between the first substrate and the second substrate, wherein
the first substrate has a plurality of signal lines and scanning lines formed in a matrix, an upper electrode having a plurality of slit-shaped openings formed for every sub-pixel divided by the scanning lines and the signal lines, and a lower electrode formed with the upper electrode through an insulating layer,
the second substrate has a light-shielding layer superimposed with the signal lines and the scanning lines in a planar view, and a color filter layer formed for every sub-pixel described above, and
the liquid crystal layer is formed of a mixture of at least one compound having a negative dielectric anisotropy and at least one compound having a positive dielectric anisotropy.
2. The liquid crystal panel according to claim 1 , wherein the upper electrode and the lower electrode overlaps with each other in a planar view.
3. The liquid crystal panel according to claim 1 , wherein the compound having the negative dielectric anisotropy has a structure represented by formula (a), and a dielectric anisotropy in a range of −10 or more and −2 or less, and the compound having the positive dielectric anisotropy has a dielectric anisotropy in a range of 2 or more and 30 or less:
4. The liquid crystal panel according to claim 3 , wherein the number of rings of the compound having the negative dielectric anisotropy is 3 or more, and the compound having the positive dielectric anisotropy has a skeleton of any of 2-tetrahydropyran-1,4-yl, 3-tetrahydropyran-1,4-yl and 3,5-dioxane-1,4-yl.
5. The liquid crystal panel according to claim 3 , wherein a ratio of the compound having the negative dielectric anisotropy is in a range of 5% by weight or more and 60% by weight or less.
6. The liquid crystal panel according to claim 4 , wherein a ratio of the compound having the negative dielectric anisotropy is in a range of 5% by weight or more and 60% by weight or less.
7. The liquid crystal panel according to claim 1 , wherein a color difference during a white display of the liquid crystal panel is 0.05 or less in a range: 0°<θ≦60°, when an angle of the liquid crystal panel from a display horizontal plane is taken as θ.
8. The liquid crystal panel according to claim 2 , wherein a color difference during a white display of the liquid crystal panel is 0.05 or less in a range: 0°<θ≦60°, when an angle of the liquid crystal panel from a display horizontal plane is taken as θ.
9. The liquid crystal panel according to claim 3 , wherein a color difference during a white display of the liquid crystal panel is 0.05 or less in a range: 0°<θ≦60°, when an angle of the liquid crystal panel from a display horizontal plane is taken as θ.
10. The liquid crystal panel according to claim 4 , wherein a color difference during a white display of the liquid crystal panel is 0.05 or less in a range: 0°<θ≦60°, when an angle of the liquid crystal panel from a display horizontal plane is taken as θ.
11. The liquid crystal panel according to claim 5 , wherein a color difference during a white display of the liquid crystal panel is 0.05 or less in a range: 0°<θ≦60°, when an angle of the liquid crystal panel from a display horizontal plane is taken as θ.
12. The liquid crystal panel according to claim 6 , wherein a color difference during a white display of the liquid crystal panel is 0.05 or less in a range: 0°<θ≦60°, when an angle of the liquid crystal panel from a display horizontal plane is taken as θ.
13. The liquid crystal panel according to claim 5 , wherein the liquid crystal panel has a ratio of refractive index anisotropy to dielectric anisotropy in a range of 0.009 or more and 0.045 or less.
14. The liquid crystal panel according to claim 7 , wherein the liquid crystal panel has a ratio of refractive index anisotropy to dielectric anisotropy in a range of 0.009 or more and 0.045 or less.
15. The liquid crystal panel according to claim 9 , wherein the liquid crystal panel has a ratio of refractive index anisotropy to dielectric anisotropy in a range of 0.009 or more and 0.045 or less.
16. The liquid crystal panel according to claim 11 , wherein the liquid crystal panel has a ratio of refractive index anisotropy to dielectric anisotropy in a range of 0.009 or more and 0.045 or less.