US 12,386,504 B2
Display device and presentation device equipped with same
Ryota Kanda, Kyoto (JP); Junya Fujita, Kyoto (JP); and Naoya Kakimoto, Kyoto (JP)
Assigned to OMRON CORPORATION, Kyoto (JP)
Filed by OMRON CORPORATION, Kyoto (JP)
Filed on Sep. 3, 2024, as Appl. No. 18/822,538.
Claims priority of application No. 2023-167793 (JP), filed on Sep. 28, 2023.
Prior Publication US 2025/0110638 A1, Apr. 3, 2025
Int. Cl. G06F 3/04886 (2022.01); G07F 9/02 (2006.01); G09G 3/00 (2006.01)
CPC G06F 3/04886 (2013.01) [G07F 9/026 (2013.01); G09G 3/002 (2013.01)] 11 Claims
OG exemplary drawing
 
1. A display device comprises a switch unit configured to detect a finger approaching or touching a push button to be operated thereby and a display unit configured to display a desired numeral,
the switch unit including:
a first light projecting unit configured to emit a light;
a first light guide plate having an incident surface on which light emitted from the first light projecting unit is incident, a plurality of first prisms configured to reflect the light incident from the incident surface toward a side approached or touched by the finger and are provided at positions corresponding to the push buttons, and an exit surface configured to emit the light reflected by the first prisms in a direction in which the finger approaches or touches;
a plurality of light receiving units that are provided at positions corresponding to the push buttons and is configured to receive the light emitted from the exit surface and reflected by the finger approaching or touching the push button; and
a detection unit configured to detect the finger approaching or touching of the finger depending on an amount of light received by the light receiving unit,
the display device including:
a seven-segment display unit configured to display the desired numeral, and
a second light projecting unit configured to emit light for displaying the desired numeral in the seven-segment display unit,
wherein the first prisms reflect the light so as to compensate for the amount of light that decreases according to a distance from the first light projecting unit.