Liquid crystal display apparatus
View Patent ↗A liquid crystal display apparatus comprises a planar first electrode, multiple second electrodes and third electrodes that overlap with the first electrode and are alternately arranged, in correspondence to one subpixel. The second electrode and the third electrode are independently driven. A voltage for driving the liquid crystal is individually applied between the second electrode and the first electrode and between the third electrode and the first electrode.
1. A liquid crystal display apparatus, comprising:
a pair of substrates;
liquid crystal held between the pair of substrates;
a plurality of scanning lines arranged on one substrate of the pair of substrates;
a plurality of data lines arranged on the one substrate so as to cross the scanning lines;
a transparent and planar first electrode arranged, on the one substrate, in a region opened in correspondence to each of a plurality of subpixels arranged in matrix divided by the scanning lines and the data lines; and
at least one second electrode and at least one third electrode alternately arranged in a front view above the first electrode with an insulating film intervening,
wherein
the second electrode and the third electrode are independently driven, and
a voltage for driving the liquid crystal is individually applied between the second electrode and the first electrode and between the third electrode and the first electrode,
wherein
a reference potential is applied to the first electrode,
a potential for gradation-driving is applied to the second electrode in a case where a gradation level in a subpixel is in a range from a lowest gradation level to a specific gradation level, and
the reference potential is applied to the third electrode in the case where the gradation level in the subpixel is in a range from the lowest gradation level to the specific gradation level, and the potential for gradation-driving is applied to the third electrode in a case where the gradation level is in a range from a gradation level one higher than the specific gradation level to a highest gradation level.
2. The liquid crystal display apparatus according to claim 1 , wherein
two scanning lines are included in a region of a subpixel,
active elements are provided respectively for the two scanning lines, and
the second electrode and the third electrode are driven respectively by the active elements.
3. The liquid crystal display apparatus according to claim 2 , wherein
capacitance parasitic on each of the active elements in the region of the subpixel is substantially the same.
4. The liquid crystal display apparatus according to claim 1 , wherein
a constant potential is applied to the second electrode in the case where the gradation level is in the range from the specific gradation level to the highest gradation level.
5. The liquid crystal display apparatus according to claim 4 , wherein
the potential applied to the second electrode in the case where the gradation level is in the range from the specific gradation level to the highest gradation level is the same as the potential applied to the third electrode in the case where the gradation level is at the highest gradation level.
6. The liquid crystal display apparatus according to claim 1 , wherein
the potential for gradation-driving is applied to the third electrode such that light transmittance of the liquid crystal at a gradation level one higher than the specific gradation level is larger than the light transmittance at the specific gradation level.
7. The liquid crystal display apparatus according to claim 1 , wherein
a storage capacitance formed by the first electrode and the second electrode is substantially the same as the storage capacitance formed by the first electrode and the third electrode.
8. The liquid crystal display apparatus according to claim 1 , wherein
the second electrode and the third electrode are formed on a same insulating film.
9. The liquid crystal display apparatus according to claim 1 , wherein
the second electrode and the third electrode are formed on different insulating films.
10. A liquid crystal display apparatus, comprising:
a pair of substrates;
liquid crystal held between the pair of substrates;
a plurality of scanning lines arranged on one substrate of the pair of substrates;
a plurality of data lines arranged on the one substrate so as to cross the scanning lines;
a transparent and planar first electrode arranged, on the one substrate, in a region opened in correspondence to each of a plurality of subpixels arranged in matrix divided by the scanning lines and the data lines; and
at least one second electrode and at least one third electrode alternately arranged in a front view above the first electrode with an insulating film intervening,
wherein
the second electrode and the third electrode are independently driven,
a voltage for driving the liquid crystal is individually applied between the second electrode and the first electrode and between the third electrode and the first electrode,
a reference potential is applied to the first electrode,
a potential for gradation-driving is applied to the second electrode in a case where a gradation level in a subpixel is in a range from a lowest gradation level to a specific gradation level, and
the reference potential is applied to the third electrode in a case where the gradation level is in a range from the lowest gradation level to a gradation level one lower than the specific gradation level, and a potential for gradation-driving is applied to the third electrode in a case where the gradation level is in a range from the specific gradation level to a highest gradation level.
11. The liquid crystal display apparatus according to claim 10 , wherein
a constant potential is applied to the second electrode in the case where the gradation level is in the range from the specific gradation level to the highest gradation level.
12. The liquid crystal display apparatus according to claim 11 , wherein
the potential applied to the second electrode in the case where the gradation level is in the range from the specific gradation level to the highest gradation level is the same as the potential applied to the third electrode in the case where the gradation level is at the highest gradation level.
13. The liquid crystal display apparatus according to claim 10 , wherein
the potential for gradation-driving is applied to the third electrode such that light transmittance of the liquid crystal at a gradation level one higher than the specific gradation level is larger than the light transmittance at the specific gradation level.
14. A liquid crystal display apparatus comprising:
a pair of substrates;
liquid crystal held between the pair of substrates;
a plurality of scanning lines arranged on one substrate of the pair of substrates;
a plurality of data lines arranged on the one substrate so as to cross the scanning lines;
a transparent and planar first electrode arranged, on the one substrate, in a region opened in correspondence to each of a plurality of subpixels arranged in matrix divided by the scanning lines and the data lines; and
at least one second electrode and at least one third electrode alternately arranged in a front view above the first electrode with an insulating film intervening,
wherein
the second electrode and the third electrode are independently driven, and
a voltage for driving the liquid crystal is individually applied between the second electrode and the first electrode and between the third electrode and the first electrode,
wherein
in a case where a gradation level in a subpixel is not more than a specific gradation level which is between a lowest gradation level and a highest gradation level, a voltage corresponding to the gradation level is applied between the second electrode and the first electrode and a constant voltage is applied between the third electrode and the first electrode, and
in a case where the gradation level is more than the specific gradation level, a constant highest voltage is applied between the second electrode and the first electrode and a voltage corresponding to the gradation level is applied between the third electrode and the first electrode.
15. A liquid crystal display apparatus, comprising:
a pair of substrates;
liquid crystal held between the pair of substrates;
a plurality of scanning lines arranged on one substrate of the pair of substrates;
a plurality of data lines arranged on the one substrate so as to cross the scanning lines;
a transparent and planar first electrode arranged, on the one substrate, in a region opened in correspondence to each of a plurality of subpixels arranged in matrix divided by the scanning lines and the data lines; and
at least one second electrode and at least one third electrode alternately arranged in a front view above the first electrode with an insulating film intervening,
wherein
the second electrode and the third electrode are independently driven, and
a voltage for driving the liquid crystal is individually applied between the second electrode and the first electrode and between the third electrode and the first electrode,
two scanning lines are included in a region of a subpixel and are not shared by subpixels adjacent in the direction crossing the scanning line,
active elements are provided respectively for the two scanning lines, and
the second electrode and the third electrode are driven respectively by the active elements.