# US 12,181,747 B2 · Backlight module and display device

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- Number: US 12,181,747 B2
- Document ID: US12181747B2
- Status: Granted
- Kind: B2
- Application number: 17/922,465
- Filed: 2021-11-26
- Published: 2024-07-04
- Granted: 2024-12-31
- Earliest claimed: 2021-11-26
- Applicants: Hefei Raysees Ai Technology Co., Ltd.
- Inventors: Daoyong Wang; Zhentao Li; Danyong Li; Yang Wang
- Web page: https://patentgrep.com/patent/US12181747B2

## CPC

- G02F 1/133611: {including means for improving the brightness uniformity}
- G02F 1/133603: {with LEDs}
- G02F 1/133606: {including a specially adapted diffusing, scattering or light controlling members}
- G02F 1/133607: {the light controlling member including light directing or refracting elements, e.g. prisms or lenses}
- 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

## Abstract

A display device (200) includes a display panel (210), a light source (221) on a substrate (215), and an adjacent light source (221). The adjacent light source (221) is spaced apart from the light source (221) by a predetermined distance. The light source (221) emits light to irradiate an interface between the substrate (215) and a member of the display panel (210) via a lens (222). Light emitted from the light source (221) irradiates a spot on the interface via the lens (222) with luminance below a darkness level. The spot is aligned with the adjacent light source (221) in a direction perpendicular to the substrate (215).

## Claims

### Claim 1

A backlight module for a display device, comprising:
a substrate and a plurality of LED light sources disposed on the substrate following a grid pattern to form a plurality of rectangle-shaped lighting units,
wherein each lighting unit comprises four LED light sources disposed at the lighting unit's four corners, respectively, has a length L along a first direction X and a width W along a second direction Y, and irradiates a corresponding rectangular area with the same length L and width W on an interface of the display device,
wherein each LED light source comprises an LED and a corresponding lens disposed above the LED, the corresponding lens directing light rays emitted from the LED onto
(1) a first corner of the corresponding rectangular area on the interface of the display device with a first luminance value E1,
(2) a second corner of the corresponding rectangular area with luminance of zero or substantially close to zero, wherein a distance between the first corner and the second corner is L along the X direction,
(3) a first location (x, 0) with a luminance value E (x, 0) that is determined based on a linear change of luminance value from the first luminance value E1 at the first corner to zero luminance at the second corner, wherein the first location is on a first border line between the first corner and the second corner, and x is a distance between the first location (x, 0) and the first corner along the X direction,
(4) a third corner of the corresponding rectangular area with luminance of zero or substantially close to zero, wherein a distance between the first corner and the third corner is W along the Y direction,
(5) a second location (0, y) with a luminance value E (0, y) that is determined based on a linear change of luminance value from the first luminance value E1 at the first corner to zero luminance at the third corner, wherein the second location is on a second border line between the first corner and the third corner, and y is a distance between the second location (0, y) and the first corner along the Y direction, and
(6) a location (x, y) of the corresponding rectangular area with a luminance value of E (x, y) that is a product of E (x, 0) and E (0, y).

### Claim 2 (depends on 1)

The backlight module of claim 1, wherein the LED is a mini light emitting diode (mini-LED).

### Claim 3 (depends on 1)

The backlight module of claim 1, wherein the LED has a dimension smaller than 300 micrometers along the X direction or Y direction.

### Claim 4 (depends on 1)

The backlight module of claim 1, wherein luminance uniformity in the corresponding rectangular area on the interface of the display device is beyond a predetermined value when the four LED light sources at the lighting unit's four corners irradiate the corresponding rectangular area.

### Claim 5 (depends on 1)

The backlight module of claim 1, wherein the display device has a liquid crystal display (LCD) panel.

### Claim 6 (depends on 1)

The backlight module of claim 1, wherein corresponding lenses of the plurality of LED light sources form an array of lenses with the grid pattern.

### Claim 7 (depends on 6)

The backlight module of claim 6, wherein the array of lenses is made by molding.

### Claim 8 (depends on 7)

The backlight module of claim 7, wherein a molded optical component includes the array of lenses.

### Claim 9 (depends on 1)

The backlight module of claim 1, wherein the length L and width W are smaller than 9 millimeters, respectively.

### Claim 10 (depends on 1)

The backlight module of claim 1, wherein a distance between the interface and the substrate is smaller than 6 millimeters.