US 12,135,473 B2
Display device including first periphery light guide region, second periphery light guide region, and middle light guide region
Chang-Min Shao, Taoyuan (TW); Chien-Hao Kao, Taoyuan (TW); Chih-Chun Chang, Taoyuan (TW); and Jyun-Sheng Syu, Taoyuan (TW)
Assigned to Qisda Corporation, Taoyuan (TW)
Filed by Qisda Corporation, Taoyuan (TW)
Filed on Jun. 15, 2023, as Appl. No. 18/210,129.
Claims priority of application No. 202210921884.9 (CN), filed on Aug. 2, 2022.
Prior Publication US 2024/0045130 A1, Feb. 8, 2024
Int. Cl. G02F 1/13 (2006.01); F21V 8/00 (2006.01); G02F 1/1335 (2006.01)
CPC G02F 1/1323 (2013.01) [G02B 6/0036 (2013.01); G02B 6/0043 (2013.01); G02B 6/0053 (2013.01); G02B 6/0055 (2013.01); G02B 6/0058 (2013.01); G02B 6/0068 (2013.01); G02B 6/0076 (2013.01); G02F 1/133626 (2021.01); G02F 1/133627 (2021.01)] 18 Claims
OG exemplary drawing
 
1. A display device, comprising:
a display panel; and
a backlight module on the display panel, wherein the backlight module comprises:
a first light guide plate;
a second light guide plate between the first light guide plate and the display panel, wherein the second light guide plate comprises diffuser dots;
an optical film between the first light guide plate and the second light guide plate;
a first light emitting unit providing first light to the first light guide plate, wherein the first light is converted into collimated light through the first light guide plate and the optical film;
a second light emitting unit providing second light to the second light guide plate, wherein the second light is scattered by the diffuser dots of the second light guide plate; and
a control unit electrically connected to the first light emitting unit and the second light emitting unit, wherein the control unit adjusts a viewing angle of the display device by adjusting the relative intensity of the first light provided by the first light emitting unit and the second light provided by the second light emitting unit, wherein the diffuser dots comprises first diffuser dots arranged in periphery of the second light guide plate and second diffuser dots arranged in middle of the second light guide plate, the first diffuser dots have a first pitch, the second diffuser dots have a second pitch, and the first pitch is smaller than the second pitch.