Liquid crystal display device and electronic device including the same
View Patent ↗Provided is a display device which can perform, with a simpler structure, switching between naked-eye 3D image display by a parallax barrier method and 2D image display without a decrease in resolution. In order to reduce manufacturing cost by reducing the number of polarizing plates, a light-shuttering portion including a polymer-dispersed liquid crystal which does not need a polarizing plate is used as a parallax barrier. Further, a light source portion serving as a backlight is formed using a light source including an EL element which forms a planar light source and does not need a diffusion plate. Furthermore, as the light source portion serving as the backlight, a plurality of EL elements are provided so that the plurality of EL elements are selectively controlled and thus selective light emission is performed.
1. A liquid crystal display device comprising:
a light source portion;
a light-shuttering portion over the light source portion; and
a liquid crystal panel over the light-shuttering portion, the liquid crystal panel comprising a first pixel portion for displaying a left-eye image and a second pixel portion for displaying a right-eye image,
wherein the light-shuttering portion comprises a polymer dispersed liquid crystal interposed between a pair of electrodes,
wherein one of the pair of electrodes is stripe-shaped,
wherein the pair of electrodes is arranged so that a stripe-shaped light-transmitting portion and a stripe-shaped light-blocking portion are formed by controlling a voltage applied to the pair of electrodes,
wherein the polymer dispersed liquid crystal is included in both the stripe-shaped light-transmitting portion and the stripe-shaped light-blocking portion, and
wherein the light source portion is configured to selectively exist in a lighted state or a non-lighted state in a region overlapping with the one of the pair of electrodes.
2. The liquid crystal display device according to claim 1 , wherein each of the first pixel portion and the second pixel portion comprises a color filter, a liquid crystal element, and a switching element for driving the liquid crystal element.
3. The liquid crystal display device according to claim 2 , wherein the switching element comprises an oxide semiconductor.
4. An electronic device comprising the liquid crystal display device according to claim 1 .
5. An electronic device comprising a first housing and a second housing combined with each other, wherein at least one of the first housing and the second housing comprises the liquid crystal display device according to claim 1 .
6. The electronic device according to claim 5 , wherein the first housing and the second housing are combined with a hinge so that the electronic device is able to be opened and closed.
7. The electronic device according to claim 5 , wherein the electronic device is selected from a game machine and an electronic book reader.
8. The liquid crystal display device according to claim 1 , further comprising a pair of polarization plates which sandwiches the liquid crystal panel.
9. The liquid crystal display device according to claim 1 ,
wherein the liquid crystal panel comprises a color filter,
wherein a part of the stripe-shaped light-blocking portion does not overlap with the color filter.
10. The liquid crystal display device according to claim 1 ,
wherein the pair of electrodes is located over a substrate, and
wherein the polymer dispersed liquid crystal is in direct contact with the substrate in the stripe-shaped light-transmitting portion.
11. A liquid crystal display device comprising:
a light source portion comprising a plurality of electroluminescent elements;
a light-shuttering portion over the light source portion; and
a liquid crystal panel over the light-shuttering portion, the liquid crystal panel comprising a first pixel portion for displaying a left-eye image and a second pixel portion for displaying a right-eye image,
wherein the light-shuttering portion comprises a polymer dispersed liquid crystal interposed between a pair of electrodes,
wherein one of the pair of electrodes is stripe-shaped,
wherein the pair of electrodes is arranged so that a stripe-shaped light-transmitting portion and a stripe-shaped light-blocking portion are formed by controlling a voltage applied to the pair of electrodes,
wherein the polymer dispersed liquid crystal is included in both the stripe-shaped light-transmitting portion and the stripe-shaped light-blocking portion, and
wherein the light source portion is configured to selectively exist in a lighted state or a non-lighted state in a region overlapping with the one of the pair of electrodes.
12. The liquid crystal display device according to claim 11 , wherein each of the first pixel portion and the second pixel portion comprises a color filter, a liquid crystal element, and a switching element for driving the liquid crystal element.
13. The liquid crystal display device according to claim 12 , wherein the switching element comprises an oxide semiconductor.
14. The liquid crystal display device according to claim 11 ,
wherein the plurality of electroluminescent elements are arranged in matrix, and
wherein each of the plurality of electroluminescent elements is individually driven by a transistor.
15. The liquid crystal display device according to claim 11 , wherein each of the plurality of electroluminescent elements emits white light.
16. A game machine comprising the liquid crystal display device according to claim 11 .
17. An electronic device comprising the liquid crystal display device according to claim 11 .
18. An electronic device comprising a first housing and a second housing combined with each other, wherein at least one of the first housing and the second housing comprises the liquid crystal display device according to claim 11 .
19. The electronic device according to claim 18 , wherein the first housing and the second housing are combined with a hinge so that the electronic device is able to be opened and closed.
20. The electronic device according to claim 18 , wherein the electronic device is selected from a game machine and an electronic book reader.
21. The liquid crystal display device according to claim 11 , further comprising a pair of polarization plates which sandwiches the liquid crystal panel.