Optical path control member and display device comprising same
An optical path control member according to an embodiment comprises: a first substrate; a first electrode arranged on the first substrate; a second substrate arranged on the first substrate; a second electrode arranged beneath the second substrate; and a light conversion unit arranged between the first electrode and the second electrode, wherein the light conversion unit comprises a partition part and an accommodation part alternately arranged, the accommodation part includes a dispersion liquid and light conversion particles dispersed in the dispersion liquid, the accommodation part operates in a public mode or a privacy mode according to whether a voltage is applied, a first voltage is applied when changing from the privacy mode to the public mode, a second voltage and a third voltage are applied when changing from the public mode to the privacy mode, and the second voltage and/or the third voltage include a pulse voltage.
1 . An optical path control member comprising:
a first substrate;
a first electrode disposed on the first substrate;
a second substrate disposed on the first substrate;
a second electrode disposed under the second substrate; and
a light conversion unit disposed between the first electrode and the second electrode,
wherein the light conversion unit includes a plurality of partition parts and a plurality of accommodation parts alternately disposed,
each of the plurality of accommodation parts includes a dispersion liquid and light conversion particles dispersed in the dispersion liquid,
the plurality of accommodation parts are driven in a public mode and a privacy mode depending on whether a voltage is applied,
the plurality of accommodation parts are converted from the privacy mode to the public mode, when a first voltage is applied,
the plurality of accommodation parts are converted from the public mode to the privacy mode, when a second voltage and a third voltage are applied, and
wherein the second voltage has a pulse voltage in which a negative voltage and a positive voltage are continuously repeated, and the third voltage has a pulse voltage in which a negative voltage and a positive voltage are continuously repeated after the second voltage is applied, wherein an application time of the negative voltage in the pulse voltage of each of the second voltage and the third voltage is greater than an application time of the positive voltage in the pulse voltage of each of the second voltage and the third voltage, respectively,
wherein absolute values of the first voltage, the positive voltage of the second voltage, the negative voltage of the second voltage, the positive voltage of the third voltage, and the negative voltage of the third voltage are equal, and
wherein a ratio of the application time of the negative voltage and the application time of the positive voltage of the second voltage is greater than 8:1 and less than 9:1.
2 . A display device comprising:
a display panel including a light source; and
the optical path control member of claim 1 disposed on the display panel.
3 . The display device of claim 2 , wherein the display panel includes a backlight unit and a liquid crystal display panel,
the optical path control member is disposed between the backlight unit and the liquid crystal display panel, and
light emitted from the backlight unit moves from the second substrate toward the first substrate.
4 . The optical path control member of claim 1 , wherein the positive voltage of the third voltage and the negative voltage of the third voltage are repeated at 10 to 15 cycles.
5 . The optical path control member of claim 1 , wherein total application time, which is a sum of an application time of the second voltage and an application time of the third voltage, is 3 seconds or less.
6 . The optical path control member of claim 1 , wherein a number of cycles of the third voltage is greater than a number of cycles of the second voltage.