US 12,292,652 B1
User-adjustable color mixing backlight for transflective display
Anjan Katta, San Francisco, CA (US); and Ibrahim Iskender Kushan, Los Angeles, CA (US)
Assigned to Daylight Computer Co., Fremont, CA (US)
Filed by Daylight Computer Co., Fremont, CA (US)
Filed on Feb. 22, 2024, as Appl. No. 18/584,698.
Int. Cl. G02F 1/1335 (2006.01); G02F 1/13357 (2006.01)
CPC G02F 1/133612 (2021.01) [G02F 1/133603 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A transflective display device, the device comprising:
a display surface; and
an optical path configured to spatially modulate light emitted from a primary light source, and to direct the spatially modulated light to the display surface, thereby generating a display of visual information on the display surface, wherein the optical path includes:
a reflective spatial light modulator having a modulating side and a backside opposite the modulating side, wherein the reflective spatial light modulator is configured to receive light from the primary light source at the modulating side, and to spatially modulate the received light by selectively reflecting the light at separately addressable positions on the modulating side along the optical path toward the display surface, wherein the reflective spatial light modulator is further configured to at least partially transmit light received at the backside such that light transmitted through the backside is introduced to the optical path and directed toward the display surface and combined with the light from the primary light source and selectively reflected by the reflective spatial light modulator from the modulating side such that the combined light is brighter than the light from the primary light source and selectively reflected by the reflective spatial light modulator from the modulating side;
a set of LEDs configured to emit light that is directed to the backside of the reflective spatial light modulator, wherein the set of LEDs includes a first group of LEDs that emit white light and a second group of LEDs that emit light having a first color; and
one or more drivers configured to drive the set of LEDs such that the relative intensity of the light emitted by the first group of LEDs and the second group of LEDs is configurable via a control signal, thereby facilitating the control signal to dictate the tone of the light emitted by the set of LEDs and transmitted through the reflective spatial light modulator.