# US 12,001,113 B2 · Display substrate having electrochromic structure with changeable transmittance, display apparatus and display method therefor

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- Number: US 12,001,113 B2
- Document ID: US12001113B2
- Status: Granted
- Kind: B2
- Application number: 17/920,748
- Filed: 2021-06-01
- Published: 2023-06-01
- Granted: 2024-06-04
- Earliest claimed: 2020-06-05
- Assignees: Boe Technology Group Co., Ltd.
- Applicants: BOE Technology Group Co., Ltd.
- Inventors: Yanhui Lu; Kang Guo; Xiao Zhang; Duohui Li; Xueyuan Zhou; Mengya Song; Jin Zhao
- Web page: https://patentgrep.com/patent/US12001113B2

## CPC

- G02F 1/163: Operation of electrochromic cells, e.g. electrodeposition cells; Circuit arrangements therefor
- G02F 1/133502: {Antiglare, refractive index matching layers}
- G02F 1/133528: {Polarisers}
- G02F 1/15: based on an electrochromic effect
- G02F 1/155: Electrodes
- G02F 1/157: Structural association of cells with optical devices, e.g. reflectors or illuminating devices
- G09G 3/2007: {Display of intermediate tones}
- G09G 3/38: using electrochromic devices
- H10K 59/50: OLEDs integrated with light modulating elements, e.g. with electrochromic elements, photochromic elements or liquid crystal elements
- G02F 1/137: characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering
- G02F 2201/44: Arrangements combining different electro-active layers, e.g. electrochromic, liquid crystal or electroluminescent layers
- G02F 2201/52: RGB geometrical arrangements
- G09G 3/20: for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix {no fixed position being assigned to or needed to be assigned to the individual characters or partial characters}
- G09G 2320/0271: Adjustment of the gradation levels within the range of the gradation scale, e.g. by redistribution or clipping
- G09G 2320/0626: for control of overall brightness
- G09G 2320/066: for control of contrast
- G09G 2360/16: Calculation or use of calculated indices related to luminance levels in display data
- G02F: OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G09G: ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION (arrangements for transferring data between digital computers and displays G06F3/14; static indicating arrangements comprising an association of a number of separate sources or light control cells G09F9/00; static indicating arrangements comprising integral associations of a number of light sources H01J, H01K, H10H, H05B33/12; scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission, details thereof H04N1/00)
- H10K: ORGANIC ELECTRIC SOLID-STATE DEVICES

## Abstract

Provided are a display substrate, a display apparatus and a display method therefor. The display substrate includes: a base substrate; pixel units on the base substrate; and an electrochromic structure on a side of the pixel units that is away from the base substrate. The transmittance of the electrochromic structure is positively correlated with the brightness of the pixel units when displaying an image, such that the contrast of the display substrate is improved, and the display effect is improved.

## Claims

### Claim 1

A display substrate, comprising:
a base substrate;
a plurality of pixel units on the base substrate; and
an electrochromic structure on a side of the plurality of pixel units facing away from the base substrate;
wherein when the display substrate is in a mirror state, transmittance of the electrochromic structure is in an initialization state with a preset value;
when the display substrate is in a display state, the transmittance of the electrochromic structure is positively correlated with brightness of the plurality of pixel units when displaying an image;
the electrochromic structure comprises a plurality of electrochromic units;
the plurality of pixel units are in one-to-one correspondence to the plurality of electrochromic units;
transmittance of each electrochromic unit is positively correlated with brightness of a pixel unit, corresponding to the each electrochromic unit, when displaying the image;
the electrochromic unit comprises: a first electrode and a second electrode arranged sequentially facing away from the base substrate; and an electrochromic film arranged between the first electrode and the second electrode;
the electrochromic film comprises: an ion layer, an electrochromic layer, and an electrolyte layer, arranged sequentially facing away from the base substrate.

### Claim 2 (depends on 1)

The display substrate of claim 1, wherein the plurality of pixel units are of a liquid crystal display structure, the display substrate further comprises a metal linear polarizer, and the metal linear polarizer is located between the liquid crystal display structure and the electrochromic structure.

### Claim 3 (depends on 1)

The display substrate of claim 1, wherein the plurality of pixel units are OLED devices, the display substrate further comprises an encapsulation layer located on a surface of the OLED devices facing away from the base substrate, and the electrochromic structure is located on a side of the encapsulation layer facing away from the base substrate.

### Claim 4 (depends on 1)

A display apparatus, comprising the display substrate of claim 1, and a processor, wherein the processor is configured to:
receive the image;
determine brightness of the plurality of pixel units when displaying the image; and
determine a pulse voltage applied to the electrochromic structure according to the brightness, and adjust transmittance of the electrochromic structure under an action of the pulse voltage.

### Claim 5 (depends on 4)

A display method of the display apparatus according to claim 4, comprising:
receiving the image when the display apparatus is in the display state;
determining the brightness of the plurality of pixel units when displaying the image; and
determining the pulse voltage applied to the electrochromic structure according to the brightness, and adjusting the transmittance of the electrochromic structure under the action of the pulse voltage.

### Claim 6 (depends on 5)

The display method of claim 5, wherein said adjusting the transmittance of the electrochromic structure, comprises:
determining a scene where the display apparatus is located;
determining a gray level conversion rule of the plurality of pixel units when displaying the image according to the scene;
determining a gray level of the plurality of pixel units when displaying the image according to the gray level conversion rule and the brightness; and
determining the pulse voltage applied to the electrochromic structure according to the gray level, and adjusting transmittance of the electrochromic structure under the action of the pulse voltage.

### Claim 7 (depends on 6)

The display method of claim 6, wherein said determining the gray level conversion rule of the plurality of pixel units when displaying the image according to the scene, comprises:
when the scene is an indoor environment, the gray level conversion rule is:
0.299R+0.587G+0.114B=GRAY(Y);
where, R represents brightness of red sub-pixels comprised by the plurality of pixel units, G represents brightness of green sub-pixels comprised by the plurality of pixel units, B represents brightness of blue sub-pixels comprised by the plurality of pixel units, and GRAY(Y) represents the gray level of the plurality of pixel units when displaying the image.

### Claim 8 (depends on 6)

The display method of claim 6, wherein said determining the gray level conversion rule of the plurality of pixel units when displaying the image according to the scene, comprises:
when the scene is an outdoor environment, the gray level conversion rule is:
[max(R,G,B)+min(R,G,B))/2=GRAY(Y);
where, R represents brightness of red sub-pixels comprised by the plurality of pixel units, G represents brightness of green sub-pixels comprised by the plurality of pixel units, B represents brightness of blue sub-pixels comprised by the plurality of pixel units, and GRAY(Y) represents the gray level of the plurality of pixel units when displaying the image.

### Claim 9 (depends on 6)

The display method of claim 6, wherein said determining the scene where the display apparatus is located, comprises:
determining a scene artificially set for the display apparatus; or
determining a scene where the display apparatus is located according to environment parameter information where the display apparatus is located.

### Claim 10 (depends on 6)

The display method of claim 6, wherein said determining the gray level conversion rule of the plurality of pixel units when displaying the image according to the scene, comprises:
when the scene is a night environment, the gray level conversion rule is:
0.21R+0.72G+0.07B=GRAY(Y);
where, R represents brightness of red sub-pixels comprised by the plurality of pixel units, G represents brightness of green sub-pixels comprised by the plurality of pixel units, B represents brightness of blue sub-pixels comprised by the plurality of pixel units, and GRAY(Y) represents the gray level of the plurality of pixel units when displaying the image.

### Claim 11 (depends on 6)

The display method of claim 6, wherein average brightness conversion is adopted as the gray level conversion rule, and the gray level conversion rule is:
(R+G+B)/3=GRAY(Y);
where, R represents brightness of red sub-pixels comprised by the plurality of pixel units, G represents brightness of green sub-pixels comprised by the plurality of pixel units, B represents brightness of blue sub-pixels comprised by the plurality of pixel units, and GRAY(Y) represents the gray level of the plurality of pixel units when displaying the image.