Display with controllable circadian stimulation

Abstract

A display comprising: (a) a pixel array, wherein each pixel has at least four sub-pixels, the four sub-pixels comprising a red sub-pixel (R), a green sub-pixel (G), a cyan sub-pixel (C) and a violet sub-pixel (V); and (b) a controller for controlling the sub-pixels in two or more modes, namely a first mode with a first gamut in which R, G and V are operated, and a second mode with a second gamut, wherein the second gamut has two sub-gamuts, namely a first sub-gamut in which R, C and G are operated, and a second sub-gamut in which R, C and V are operated.

Description

Reference to related applications

[0001] The present application claims priority over US Provisional Patent Application 63 / 525,471, filed on July 7, 2023, the entire contents of which are hereby incorporated by reference. Field of invention

[0002] The present disclosure relates generally to a display, and in particular to a display with controllable circadian stimulation and a wide gamut. State of the art

[0003] In a conventional OLED display, there are three emitters or sub-pixels per pixel—that is, red (at 620 nm), green (at 520 nm), and blue (at 460 nm). While such a configuration provides a reasonable gamut (color range), the applicant has recognized that it offers very little flexibility for controlling circadian stimulation. As used herein, the term "circadian-stimulating energy characteristic" means any characteristic of a spectral power distribution that may have a biological effect on a person. Circadian-stimulating energy characteristics can be described in various ways, including, for example, circadian-stimulating energy (CSE), circadian stimulation (CS), equivalent melanopic illuminance (EML, equivalent melanopic lux), and M / P ratio, as well as "blue per lumen." Here, EML and the M / P ratio are of particular interest.EML provides a measure of photoreceptive input for the circadian and neurophysiological light response in humans. The M / P ratio compares the melanopic (ipRGC) potential with the light source's ability to generate light sufficient for daylight-like detail vision (photopic vision).

[0004] The applicant recognized the need for a display that offers greater control over the moderation of circadian stimulation while maintaining a wide color gamut. The present invention fulfills this requirement, among others. Brief description of the invention

[0005] The following is a simplified summary of the invention to provide a basic understanding of some aspects of it. This summary is not a comprehensive overview of the invention. It is not intended to identify key or critical elements of the invention or to define its scope. Its sole purpose is to present some concepts of the invention in a simplified form, as a preliminary exercise for the more detailed description that follows.

[0006] The applicant has recognized that eliminating the blue emitter and replacing it with a violet or a violet and a cyan emitter provides a display with a wide gamut and variable circadian stimulation.

[0007] One aspect of the invention is a display with a wide gamut and variable circadian stimulation. In an environment, the display comprises (a) a pixel array, wherein each pixel has at least four sub-pixels, the at least four sub-pixels comprising a red sub-pixel (R), a green sub-pixel (G), a cyan sub-pixel (C), and a violet sub-pixel (V); and (b) a controller for driving the sub-pixels in two or more modes, namely a first mode with a first gamut in which R, G, and V are operated, and a second mode with a second gamut, wherein the second gamut has two sub-gamuts, namely a first sub-gamut in which R, C, and G are operated, and a second sub-gamut in which R, C, and V are operated.

[0008] Another aspect of the invention is a display with a wide gamut at low circadian stimulation (CS). In one embodiment, the low-CS display comprises (a) a pixel array, wherein each pixel has at least three sub-pixels, the at least three sub-pixels comprising a red sub-pixel (R), a green sub-pixel (G), and a violet sub-pixel (V), wherein R has a peak wavelength of 600–640 nm, G has a peak wavelength of 520–560 nm, and V has a peak wavelength of 400–440 nm; and (b) a controller for driving the sub-pixels. Brief description of the drawings Fig. Figure 1 shows the spectral power distribution (SPD) of an embodiment of the violet, cyan, green and red sub-pixels. Fig. Figure 2 shows that the DCI-P3 gamut within the range defined by the embodiment of the sub-pixels of Fig. 1 of the available gamuts is provided. Fig. Figure 3 shows that the DCI-P3 gamut lies within the available sub-gamut provided in the tag mode of an embodiment of the invention. Fig. Figure 4 shows that the DCI-P3 gamut lies within the available sub-gamut provided in the night mode of an embodiment of the invention. Fig. 5A - C show metameres of different colors using the in Fig. 1. Sub-pixel implementation shown. Fig. Figure 6 shows a schematic of one embodiment of the display. Description of the embodiments

[0009] In the following paragraphs, the present invention is described in more detail with reference to examples and the accompanying drawings. In this description, the preferred embodiments and illustrated examples should be considered as illustrations rather than limitations of the present invention. As used herein, "present invention" refers to any embodiment of the invention described herein and any equivalents. Furthermore, a reference throughout this document to various features of the "present invention" does not imply that all claimed embodiments or methods must necessarily include the feature referred to.

[0010] In one embodiment, the present invention relates to a display comprising: (a) a pixel array, wherein each pixel has at least four sub-pixels, the four sub-pixels comprising a red sub-pixel (R), a green sub-pixel (G), a cyan sub-pixel (C) and a violet sub-pixel (V); and (b) a controller for controlling the sub-pixels in two or more modes, namely a first mode with a first gamut in which R, G and V are operated, and a second mode with a second gamut, wherein the second gamut has two sub-gamuts, namely a first sub-gamut in which R, C and G are operated, and a second sub-gamut in which R, C and V are operated.

[0011] It is worth noting that the pixel array in this embodiment does not have a blue sub-pixel.

[0012] In one embodiment, the sub-pixels are emissive. For example, the sub-pixels can be OLEDs or microLEDs.

[0013] Referring to Fig. Figure 1 shows the spectral power distribution (SPD) of an embodiment of the violet, cyan, green, and red sub-pixels. As shown, R has a peak wavelength of 600–640 nm, G a peak wavelength of 520–560 nm, C a peak wavelength of 470–510 nm, and V a peak wavelength of 400–440 nm. In particular, R has a peak wavelength of 610–630 nm, G a peak wavelength of 530–550 nm, C a peak wavelength of 480–500 nm, and V a peak wavelength of 410–430 nm. Even more preferably, R has a peak wavelength of 620 nm, G a peak wavelength of 543 nm, C a peak wavelength of 487 nm and V a peak wavelength of 425 nm.

[0014] As in Fig. 2 visible, the entire gamut area of ​​DCI-P3 is contained in the gamut provided by the sub-pixels of this embodiment.

[0015] In one embodiment, the sub-pixels operate in at least two main modes: a first mode, or night mode, and a second mode, or day mode. A mixed state is also possible, which can be used as a transition during dawn and dusk.

[0016] In night mode, the influence of the display can be minimized by reducing the cyan channel. In one embodiment, this is achieved by dividing the gamut into two zones or sub-gamuts. As in Fig. As shown in Figure 4, Zone 1, or the RGV sub-gamut, essentially overlaps the target gamut, so a good display could be achieved using only Zone 1. Alternatively, the cyan channel can be used to extend the display gamut during night mode operation by employing the GCV sub-gamut, which is shown in Fig. 4 is shown as Zone 2. It should be noted that the use of Zone 2 increases the blue content of images containing colors in this range.

[0017] To maximize the daylight influence in day mode, the display should maximize the use of the cyan channel. In one embodiment, this can be achieved by dividing the gamut into two sections or sub-gamuts produced by RGC and RCV respectively, designated as Zone 1 and 2. Fig. Figure 3 shows the display gamut (e.g., DCI-P3) overlaps with both sub-gamuts, as shown in Fig. Figure 3 shows that during decoding, the integrated display driver circuit (DDIC) selects which sub-gamut to use on a pixel-by-pixel basis.

[0018] In one embodiment, the day and night modes are controlled by a circadian signal. For example, in one embodiment, the circadian signal is encoded in a single dimension with a limited range, e.g., from 0 to 1, where 0 is full night mode and 1 is full day mode, and any value between 0 and 1 corresponds to a proportional mixture of night and day modes. The circadian signal can be designed to follow the local time / date, thus reflecting the sun's path, or it can be tailored to the specific needs of the display user.

[0019] In one embodiment, the night and day modes share common colors, with each common color having a first spectral power distribution (SPD) in night mode and a second SPD in day mode. In one embodiment, the first SPD has a lower m / p ratio than the second SPD. In another embodiment, the m / p ratio of the first SPD is less than half that of the second SPD.

[0020] In one embodiment, the first and second SPDs represent a metameric pair. For example, with reference to the Fig. 5A - C metameric pairs shown for different colors. Fig. 5A shows a metameric pair for red, Fig. 5B shows a metameric pair for green, and Fig. 5C shows a metameric pair for purple. In these drawings, the SPD labeled ZeroBlue is the SPD in night mode, and the SPD labeled MaxBlue is the SPD in day mode. As can be seen from these drawings, a common light color can be achieved by differently addressing the sub-pixels. For example, in the common red color of Fig. In night mode, sub-pixel 5A activates the violet and green sub-pixels, but not the cyan sub-pixel. Conversely, in day mode, the violet and green sub-pixels are not activated, but the cyan sub-pixel is. The red sub-pixel is activated in both modes. The result of activating different sub-pixels differently is significantly different circadian effects. In particular, in the example of Fig. 5A The m / p ratio for night mode is 0.31, while the m / p ratio for day mode is 1.33. In each example, the m / p ratio for the night mode color is less than half that of the day mode color, yet the perceived color is the same.

[0021] Referring to Fig.Figure 6 shows a schematic of an embodiment of the display 600 of the present invention. In this embodiment, an integrated display control circuit (DDIC) 6601 is configured to receive a circadian signal 603 to select one of two or more modes. In one embodiment, the DDIC is configured to receive an image data signal 602 and a circadian data signal 603. A gamut space conversion module 604 then selects one of the two or more modes based on the circadian data signal 603. A signal generation module 606 then generates the display signal in the selected mode based on the circadian data signal. A gamma correction module 604 can also be used to perform gamma correction known per se. In one embodiment, the display signal from the DDIC 6601 is received by a thin filter transistor (TFT) 607.The TFT controls the current that powers each sub-pixel - e.g., OLED 608.

[0022] In another embodiment, the display is configured for low CS only. In one embodiment, the low-CS display comprises (a) a pixel array, each pixel having at least three sub-pixels, wherein the at least three sub-pixels comprise a red sub-pixel (R), a green sub-pixel (G), and a violet sub-pixel (V); wherein R has a peak wavelength of 600–640 nm, G has a peak wavelength of 500–560 nm, and V has a peak wavelength of 400–440 nm; and (b) a controller for driving the sub-pixels. In one embodiment, R has a peak wavelength of 610– In one embodiment, R has a peak wavelength of 630 nm, G a peak wavelength of 530–550 nm, and V a peak wavelength of 410–430 nm. In another embodiment, R has a peak wavelength of 620 nm, G a peak wavelength of 543 nm, and V a peak wavelength of 425 nm.

[0023] These and other advantages can be realized in accordance with the described particular embodiments and further variations. It should be understood that the above description is intended to be illustrative, but not limiting. Many other embodiments and modifications within the concept and scope of the claims will be apparent to those skilled in the art in light of the above description. The scope of the invention should therefore be determined with reference to the appended claims, together with the full range of equivalents to which such claims entitle. QUOTES INCLUDED IN THE DESCRIPTION

[0000] This list of documents cited by the applicant was automatically generated and is included solely for the reader's convenience. The list is not part of the German patent or utility model application. The DPMA accepts no liability for any errors or omissions. Cited patent literature

[0000] US 63 / 525,471

[0001]

Claims

[1] Advertisement, comprehensive: a pixel array, wherein each pixel has at least four sub-pixels, the at least four sub-pixels comprising a red sub-pixel (R), a green sub-pixel (G), a cyan sub-pixel (C) and a violet sub-pixel (V); and a controller for controlling the sub-pixels in two or more modes, namely a first mode with a first gamut in which R, G and V are operated, and a second mode with a second gamut, wherein the second gamut has two sub-gamuts, namely a first sub-gamut in which R, C and G are operated, and a second sub-gamut in which R, C and V are operated. [2] Display according to claim 1, wherein the pixel array does not include a blue sub-pixel. [3] Display according to claim 1, wherein the sub-pixels are emissive. [4] Display according to claim 3, wherein the sub-pixels are OLEDs. [5] Display according to claim 3, wherein the sub-pixels are microLEDs. [6] Display according to claim 1, wherein R has a peak wavelength of 610 - 630 nm, G has a peak wavelength of 530 - 550 nm, C has a peak wavelength of 480 - 500 nm, and V has a peak wavelength of 410 - 430 nm. [7] Display according to claim 1, wherein R has a peak wavelength of 620 nm, G has a peak wavelength of 543 nm, C has a peak wavelength of 487 nm, and V has a peak wavelength of 425 nm. [8] Display according to claim 1, wherein the first and second gamut have common colors, wherein each common color has a first spectral power distribution (SPD) in the first gamut and a second SPD in the second gamut, wherein the first and second SPD are different, and wherein the first SPD has a lower m / p ratio than the second SPD. [9] Display according to claim 8, wherein the first and second SPD form a metameric pair. [10] Display according to claim 1, wherein the controller is configured to control the sub-pixels in a third mode, wherein the third mode is a combination of the first and second gamut. [11] Display according to claim 10, wherein the third mode comprises a first gamut and a third gamut in which G, C and V are operated. [12] Display according to claim 1, wherein the controller has an integrated display driver integrated circuit (DDIC) configured to receive a circadian data signal to select one of the two or more modes. [13] Display according to claim 12, wherein the DDIC is configured to: to receive an image data signal and a circadian data signal; to select one of the two or more modes based on the circadian data signal; and to generate a display signal in the selected mode based on the image data signal. [14] Display according to claim 12, wherein the DDIC is configured to select the first or second sub-gamuts pixel by pixel. [15] Display according to claim 12, wherein the circadian data signal ranges from 0 to 1, where 0 represents the first mode entirely, 1 represents the second mode entirely, and between 0 and 1 represents a combination of the first and second modes. [16] Display according to claim 15, wherein 0 and 1 represent a third mode. [17] Display according to claim 12, wherein the circadian data signal is based on the sun's movement. [18] Advertisement, comprehensive: a pixel array wherein each pixel has at least four sub-pixels, wherein the at least three sub-pixels are a red sub-pixel (R), a green sub-pixel (G) and include a purple sub-pixel (V); where R has a peak wavelength of 600 - 640 nm, G has a peak wavelength of 500 - 560 nm, and V has a peak wavelength of 400 - 440 nm and a controller for controlling the sub-pixels. [19] Display according to claim 18, wherein the pixel array does not include a blue sub-pixel. [20] Display according to claim 18, wherein the sub-pixels are OLEDs or microLEDs.

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