US-12622146-B2 - Self-light emitting device

US12622146B2US 12622146 B2US12622146 B2US 12622146B2US-12622146-B2

Abstract

A self-light emitting device in a tiling scheme includes an array of a plurality of self-light emitting units. Each of the self-light emitting units is partitioned into a plurality of unit regions, and each of the unit regions includes at least one light emitting cell each including one or more self-light emitting elements. A central portion and an outer edge portion of each self-light emitting unit differ in number or positions of one or more light emitting cells in each unit region.

Inventors

Manabu IWAKAWA
Kazunori Inoue

Assignees

MITSUBISHI ELECTRIC CORPORATION

Dates

Publication Date: 20260505
Application Date: 20210310

Claims (11)

1 . A self-light emitting device in a tiling scheme including an array of a plurality of self-light emitting units, wherein each of the self-light emitting units is partitioned into a plurality of unit regions, each of the unit regions includes at least one light emitting cell, each light emitting cell including one or more self-light emitting elements, a central portion and an outer edge portion of each self-light emitting unit differ in number or positions of one or more light emitting cells in each unit region, and each of unit regions in the outer edge portion of the self-light emitting unit includes a greater number of light emitting cells than each of unit regions in the central portion of the self-light emitting unit.
2 . The self-light emitting device according to claim 1 , wherein only unit regions in an outermost edge portion of the self-light emitting unit differ from unit regions in the central portion of the self-light emitting unit in number or positions of one or more light emitting cells in each unit region.
3 . The self-light emitting device according to claim 1 , wherein from among the unit regions in the outer edge portion of the self-light emitting unit, each of unit regions in corner portions of an outer edge of the self-light emitting unit includes a greater number of light emitting cells than each of unit regions in linear portions of the outer edge of the self-light emitting unit.
4 . The self-light emitting device according to claim 1 , wherein each of unit regions in the outer edge portion of the self-light emitting unit includes two or more light emitting cells differing in distance from an outer end of the self-light emitting unit.
5 . The self-light emitting device according to claim 1 , wherein each of unit regions in the outer edge portion of the self-light emitting unit includes two or more light emitting cells arranged to be offset in a direction along an outer edge of the self-light emitting unit.
6 . The self-light emitting device according to claim 1 , wherein each of unit regions at least in the outer edge portion of the self-light emitting unit includes a plurality of light emitting cells, and the plurality of light emitting cells are formed as an integrated body.
7 . The self-light emitting device according to claim 1 , wherein each of unit regions at least in the outer edge portion of the self-light emitting unit includes a plurality of light emitting cells, and from among the plurality of light emitting cells in each of the unit regions in the outer edge portion of the self-light emitting unit, at least one light emitting cell is a basic cell controlled in a similar manner to each light emitting cell in unit regions in the central portion of the self-light emitting unit, and one or more light emitting cells other than the basic cell are correction cells used for correction of brightness in a boundary portion among self-light emitting units.
8 . The self-light emitting device according to claim 1 , wherein in unit regions in the central portion of the self-light emitting unit, a position of the light emitting cell in each of the unit regions is constant, and in unit regions in the outer edge portion of the self-light emitting unit, a position of the light emitting cell in each of the unit regions is not constant.
9 . The self-light emitting device according to claim 8 , wherein in the unit regions in the outer edge portion of the self-light emitting unit, the position of the light emitting cell in each of the unit regions is determined so that light emitting cells have two or more types of distances from an outer end of the self-light emitting unit in a plurality of unit regions arranged in a direction along an outer edge of the self-light emitting unit.
10 . The self-light emitting device according to claim 8 , wherein in the unit regions in the outer edge portion of the self-light emitting unit, the position of the light emitting cell in each of the unit regions is determined so that light emitting cells are staggered in a plurality of unit regions arranged in a direction along an outer edge of the self-light emitting unit.
11 . The self-light emitting device according to claim 8 , wherein there are two or more types of spaces between light emitting cells in adjacent unit regions across a boundary between self-light emitting units, and the two or more types of spaces include a space smaller than a space between light emitting cells in adjacent unit regions in the central portion of the self-light emitting unit.

Description

CROSS-REFERENCE TO RELATED APPLICATION The present application is based on PCT filing PCT/JP2021/009460, filed Mar. 10, 2021, the entire contents of which are incorporated herein by reference. TECHNICAL FIELD The present disclosure relates to a self-light emitting device in a tiling scheme including an array of a plurality of self-light emitting units. BACKGROUND ART In the field of display devices, a self-light emitting device including self-light emitting elements, such as organic electro-luminescence (OEL) and light emitting diodes (LEDs), as a light source has been widely used in recent years. For example, an organic light emitting electro-luminescence display is a self-light emitting device including OEL as pixels, and a micro LED display is a self-light emitting device including minute LEDs (also referred to as “μLEDs”) as respective pixels. The self-light emitting device including the μLEDs is considered for diversion to a backlight of a liquid crystal display (LCD). Brightness of the backlight including the μLEDs is locally controllable, so that a display quality of the LCD, whose low contrast has been problematic, can be improved by controlling brightness in each region on the backlight in accordance with an image displayed on the LCD. Such a backlight is referred to as a local dimming backlight. A self-light emitting device in a tiling scheme, which is a large self-light emitting device formed by arranging a plurality of self-light emitting units as small self-light emitting devices, is also known. In the self-light emitting device in the tiling scheme, it is important to make boundaries between the self-light emitting units less noticeable. As technology for making the boundaries between the self-light emitting units less noticeable, Patent Document 1 below discloses technology of folding a region (non-display region) outside a display region of each of self-light emitting units over a back side to narrow a width of a boundary (seam) between self-light emitting units, for example. Patent Document 2 below discloses technology of overlapping non-display regions of adjacent self-light emitting units to narrow a width of a boundary between the self-light emitting units. PRIOR ART DOCUMENTS Patent Documents Patent Document 1: Japanese Patent Application Laid-Open No. 2014-075547Patent Document 2: Japanese Patent Application Laid-Open No. 2012-238001 SUMMARY Problem to be Solved by the Invention In technology disclosed in each of Patent Documents 1 and 2, noticeability of the boundary between the self-light emitting units due to a large width of the boundary can be prevented, but noticeability of the boundary due to a pixel pitch mismatch between the self-light emitting units caused by misalignment between the self-light emitting units, a dimensional mismatch between the self-light emitting units, and the like cannot be prevented. The present disclosure has been conceived to solve a problem as described above, and it is an object of the present disclosure to provide a self-light emitting device capable of making a boundary between adjacent self-light emitting units less noticeable even if a pixel pitch mismatch occurs between the self-light emitting units. Means to Solve the Problem A self-light emitting device according to the present disclosure is a self-light emitting device in a tiling scheme including an array of a plurality of self-light emitting units, wherein each of the self-light emitting units is partitioned into a plurality of unit regions, each of the unit regions includes at least one light emitting cell each including one or more self-light emitting elements, and a central portion and an outer edge portion of each self-light emitting unit differ in number or positions of one or more light emitting cells in each unit region. Effects of the Invention According to the self-light emitting device according to the present disclosure, a boundary between adjacent self-light emitting units can be made less noticeable even if a pixel pitch mismatch occurs between the self-light emitting units. The objects, features, aspects and advantages of the present disclosure will become more apparent from the following detailed description and the accompanying drawings. BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is a schematic plan view illustrating a configuration of a self-light emitting device according to Embodiment 1. FIG. 2 is a schematic plan view illustrating a configuration of a self-light emitting unit according to Embodiment 1. FIG. 3 is a schematic plan view illustrating a boundary portion among self-light emitting units of the self-light emitting device according to Embodiment 1. FIG. 4 is a schematic plan view illustrating a modification of the configuration of the self-light emitting unit according to Embodiment 1. FIG. 5 is a flowchart showing a process of manufacturing the self-light emitting device according to Embodiment 1. FIG. 6 is a schematic plan view illustrating a boundary portion among se