Display apparatus, assembly for adaptively modulating display contrast of display apparatus, and method of adaptively modulating display contrast of display apparatus

Patent metadata

Field	Value
Publication number	US-2020124841-A1
Application number	US-201716302562-A
Country	US
Kind code	A1
Filing date	Dec 14, 2017
Priority date	Dec 14, 2017
Publication date	Apr 23, 2020
Grant date	—

Abstract

The present application discloses a display apparatus. The display apparatus includes a display panel having a plurality of subpixels; and an array of a plurality of micro light modulators on the display panel and configured to adaptively modulate display contrast of the display apparatus. Each of the plurality of micro light modulators is configured to adaptively modulate a light intensity of light emitted out of a light emitting side of the display panel in a region corresponding to each of the plurality of micro light modulators based on a luminance level of a current image displayed in the region.

First claim

1 . A display apparatus, comprising:
a display panel having a plurality of subpixels; and an array of a plurality of micro light modulators on the display panel and configured to adaptively modulate display contrast of the display apparatus; wherein each of the plurality of micro light modulators is configured to adaptively modulate a light intensity of light emitted out of a light emitting side of the display panel in a region corresponding to each of the plurality of micro light modulators based on a luminance level of a current image displayed in the region.

2 . The display apparatus of claim 1 , wherein the region corresponding to each of the plurality of micro light modulators comprises one or more of the plurality of subpixels.

3 . The display apparatus of claim 1 , wherein the display panel has a first side distal to the array of a plurality of micro light modulators, and a second side opposite to the first side and proximal to the array of a plurality of micro light modulators; and
each of the plurality of micro light modulators is configured to adaptively modulate a first light intensity of first light emitted out of the first side of the display panel in a region corresponding to each of the plurality of micro light modulators based on a second light intensity of second light emitted out of the second side of the display panel in the region corresponding to each of the plurality of micro light modulators.

4 . The display apparatus of claim 3 , wherein the first light intensity positively correlates with the second light intensity.

5 . The display apparatus of claim 3 , wherein each of the plurality of micro light modulators is configured to adaptively modulate the first light intensity of the first light by reflecting a first portion of the second light toward the second side thereby increasing the first light intensity.

6 . The display apparatus of claim 5 , wherein each of the plurality of micro light modulators is configured to reflect a second portion of the second light along a direction away from the second side.

7 . The display apparatus of claim 6 , further comprising an adaptive control circuit configured to adaptively adjust a ratio of the first portion to the second portion in response to a change in the second light intensity thereby adaptively modulating the first light intensity based on the second light intensity.

8 . The display apparatus of claim 7 , wherein each of the plurality of micro light modulators further comprises a photosensor configured to detect the second portion of the second light.

9 . The display apparatus of claim 8 , wherein a resistance of the photosensor undergoes a change in response to the change in the second light intensity; and
the adaptive control circuit is configured to adaptively adjust the ratio of the first portion to the second portion in response to a change in the resistance of the photosensor.

10 . The display apparatus of claim 8 , further comprising a plurality of first scan lines each of which coupled to a row of micro light modulators of the plurality of micro light modulators;
a plurality of second scan lines each of which coupled to a column of micro light modulators of the plurality of micro light modulators; and a plurality of switch transistors each of which having a source coupled to one of the plurality of first scan lines, a gate coupled to one of the plurality of second scan lines, and a drain coupled to the photosensor in one of the plurality of micro light modulators.

11 . (canceled)

12 . (canceled)

13 . The display apparatus of claim 8 , wherein the adaptive control circuit comprises a differential amplifier configured to generate a voltage control signal in response to the change in the resistance of the photosensor.

14 . The display apparatus of claim 13 , wherein the adaptive control circuit further comprises:
a first transistor having a gate coupled to the differential amplifier and a source configured to be provided with a ramp voltage having a repetition frequency; a capacitor having a first electrode coupled to a drain of the first transistor; and a second transistor having a gate coupled to the first electrode of the capacitor, a source configured to be provided with a control voltage; wherein a voltage level maintained at the first electrode of the capacitor is configured to control a current passing through the source and a drain of the second transistor.

15 . (canceled)

16 . The display apparatus of claim 14 , wherein the voltage control signal is configured to turn off the first transistor so that the ramp voltage discontinues to charge the capacitor, when the resistance of the photosensor is within a range of reference resistance values.

17 . The display apparatus of claim 1 , wherein each of the plurality of micro light modulators comprises a micro mirror;
the micro mirror has a reflective surface at a first angle with respect to a surface of the second side of the display panel; the reflective surface is configured to reflect a first portion of the second light toward the second side and the second portion of the second light along a direction away from the second side; and the display apparatus further comprises an adaptive control circuit configured to control the first angle to adaptively adjust a ratio of the first portion to the second portion in response to a change in the second light intensity thereby adaptively modulating the first light intensity based on the second light intensity.

18 . The display apparatus of claim 17 , wherein each of the plurality of micro light modulators further comprises an actuator configured to control the first angle of the reflective surface with respect to the surface of the second side of the display panel.

19 . The display apparatus of claim 18 , wherein the actuator is an electromagnetic coil; and
each of the plurality of micro light modulators includes a magnet attached to the micro mirror; wherein a magnitude of a magnetic force between the electromagnetic coil and the magnet controls the first angle.

20 . The display apparatus of claim 19 , wherein each of the plurality of micro light modulators further comprises a hinge coupled to the micro mirror; and
the micro mirror is configured to rotate with respect to the hinge in response to a change in the magnetic force thereby changing the first angle.

21 . The display apparatus of claim 1 , wherein the display panel is a transparent display panel.

22 . An assembly for adaptively modulating display contrast of a display panel, comprising an array of a plurality of micro light modulators;
wherein each of the plurality of micro light modulators is configured to adaptively modulate a light intensity of light emitted out of a light emitting side of the display panel in a region corresponding to each of the plurality of micro light modulators based on a luminance level of a current image displayed in the region.

23 . A method of adaptively modulating display contrast of a display panel, comprising adaptively modulating a light intensity of light emitted out of a light emitting side of the display panel in a region corresponding to each of the plurality of micro light modulators based on a luminance level of a current image displayed in the region.

Assignees

• Boe Technology Group Co Ltd
• Beijing Boe Display Tech Co

Inventors

• Zhang Kan

Classifications

• G09G3/346

  based on modulation of the reflection angle, e.g. micromirrors (micromirrors devices per se G02B26/0833) · CPC title

• G02B26/12

  using multifaceted mirrors · CPC title

• G09G2360/14

  Detecting light within display terminals, e.g. using a single or a plurality of photosensors · CPC title

• G09G2320/066

  for control of contrast · CPC title

• G02B26/02 Primary

  for controlling the intensity of light {(G02B26/004 takes precedence)} · CPC title