Display device with different size subpixels and operating method for such a display device

Patent metadata

Field	Value
Publication number	US-10629573-B2
Application number	US-201816221367-A
Country	US
Kind code	B2
Filing date	Dec 14, 2018
Priority date	Dec 14, 2017
Publication date	Apr 21, 2020
Grant date	Apr 21, 2020

Abstract

A display device and a method for operating a display device are disclosed. In an embodiment a display device includes a plurality of image points configured for emitting visible light of adjustable color by at least one semiconductor layer sequence, wherein the image points are independently controllable of one another, wherein each of the image points includes a plurality of types of pixels and each type of pixel is configured to emit light of a particular color, wherein the pixels are independently controllable of one another, wherein each of the pixels is divided into a plurality of subpixels, the subpixels being independently controllable of one another within the associated pixel, and wherein all subpixels of the associated pixel are configured for emitting light of the same color from the display device without further color change.

First claim

What is claimed is:

1. A display device comprising:
a plurality of image points configured for emitting visible light of adjustable color by at least one semiconductor layer sequence,
wherein the image points are independently controllable of one another,
wherein each of the image points comprises a plurality of types of pixels and each type of pixel is configured to emit light of a particular color,
wherein the pixels are independently controllable of one another,
wherein each of the pixels is divided into a plurality of subpixels, the subpixels being independently controllable of one another within the associated pixel,
wherein all subpixels of the associated pixel are configured for emitting light of the same color from the display device without further color change,
wherein the subpixels within the pixels, viewed in plan view, have different sizes, and
wherein at least three subpixels of different sizes are present per pixel and these subpixels, viewed in the plan view, have a size ratio of 4:2:1.

2. The display device according to claim 1 , wherein all subpixels within a pixel and/or all pixels within an image point have a common and continuous active zone of the respective semiconductor layer sequence.

3. The display device according to claim 1 , wherein the display device is configured for displaying films in at least one of video formats 4K or UHD.

4. The display device according to claim 1 , wherein each image point comprises a pixel for generating red light, a pixel for generating green light and a pixel for generating blue light.

5. The display device according to claim 4 , wherein each different type of pixel of the semiconductor layer sequence has an active zone for generating the light of the respective color so that the red, green and blue light is generated in operation by electroluminescence.

6. The display device according to claim 4 ,
wherein the semiconductor layer sequence of the different types of pixels has a respectively identically designed active zone for generating light of only one particular color, and
wherein at least the red-emitting pixels and the green-emitting pixels are each connected to a phosphor so that at least the red light and the green light are generated in operation by photoluminescence.

7. The display device according to claim 1 , further comprising a support on which the image points are arranged and via which the image points are supplied with current.

8. The display device according to claim 7 , wherein, at a side of the support facing the image points, a thin-film transistor arrangement is located, and wherein the thin-film transistor arrangement is able to electrically control the image points.

9. The display device according to claim 7 , further comprising a plurality of intermediate carriers mounted on the support, wherein the image points are each mounted on the intermediate carriers such that the intermediate carriers are arranged between the pixels and the support, and wherein the intermediate carriers are based on silicon and each comprises a control circuit for the subpixels.

10. The display device according to claim 9 , wherein exactly one image point with all its respective subpixels is present per intermediate carrier.

11. The display device according to claim 9 , wherein a plurality of the image points with all their respective subpixels is present per intermediate carrier.

12. An operating method for a display device according to claim 1 , the method comprising:
operating the image points at least at times in such a way that not all of the subpixels per pixel generate light so that an increased contrast ratio can be achieved during operation compared to a display device without dividing the pixels into subpixels.

13. The operating method according to claim 12 , wherein the image points are operated with a pulse width modulation and without a current strength variation.

Assignees

• Osram Oled Gmbh

Inventors

• Perälä Mikko
• Halbritter Hubert
• Richter Jens

Classifications

• G09G2320/066

  for control of contrast · CPC title

• G09G3/2074

  using sub-pixels · CPC title

• G09G2320/064

  by time modulation of the brightness of the illumination source · CPC title

• G09G2300/0452

  Details of colour pixel setup, e.g. pixel composed of a red, a blue and two green components · CPC title

• G09G3/32

  semiconductive, e.g. using light-emitting diodes [LED] · CPC title