US 12,437,730 B2
Cholesteric liquid crystal display device with efficient charging capability and its charging method
Chi-Chang Liao, Tainan (TW); and Junji Tomita, Atsugi (JP)
Assigned to IRIS OPTOELECTRONICS CO., LTD., Tainan (TW)
Filed by IRIS OPTRONICS CO., LTD., Tainan (TW)
Filed on May 2, 2024, as Appl. No. 18/653,938.
Claims priority of provisional application 63/463,558, filed on May 2, 2023.
Prior Publication US 2024/0371337 A1, Nov. 7, 2024
Int. Cl. G09G 3/36 (2006.01)
CPC G09G 3/3629 (2013.01) [G09G 2300/0842 (2013.01); G09G 2320/0257 (2013.01); G09G 2360/14 (2013.01)] 6 Claims
OG exemplary drawing
 
1. A cholesteric liquid crystal display device with efficient charging capability, the cholesteric liquid crystal display device comprising:
a cholesteric liquid crystal display unit capable of changing the cholesteric liquid crystal therein to display in one of an optical state selected from a planar (PL) state and a focal conic (FC) state, wherein the FC state allowing an incident light to pass through the cholesteric liquid crystal display unit, and the PL state blocking the incident light from entering the cholesteric liquid crystal display unit;
a power unit comprising a solar cell module and an energy storage module electrically connected to the solar cell module, the solar cell module disposed on another plane of the cholesteric liquid crystal display unit where incident light enters, and the solar cell module configuring to receive the incident light passing through the cholesteric liquid crystal display unit to generate and store electrical energy when the cholesteric liquid crystal display unit in the FC state; and
a control unit coupling to the cholesteric liquid crystal display unit and the energy storage module, wherein when the control unit detecting that the electrical energy stored in the energy storage module is less than a threshold, the control unit driving the cholesteric liquid crystal display unit to display in the FC state, when the control unit detecting that the electrical energy stored in the energy storage module is greater than the threshold, the control unit driving the cholesteric liquid crystal display unit to display in the PL state, hereby blocking the incident light from reaching the solar cell module.