CN-122003004-A - Transmission type display and light-emitting structure thereof

CN122003004ACN 122003004 ACN122003004 ACN 122003004ACN-122003004-A

Abstract

The object is to provide a' transmissive display and a light-emitting structure thereof, which can suppress a decrease in brightness for an observation surface due to light irradiated to a back surface of the display through a gap between electrodes when a light source is turned on. In a light emitting structure (10) of a transmissive display having a plurality of groups of electrodes (3, 4) arranged in an array and a plurality of LEDs (8) having light transmittance arranged so as to span between the electrodes (3, 4) of each group, a reflection part (9) arranged in a target region including a region shielding the light path is provided on the light path in the direction from a portion facing a gap between the electrodes (3, 4) among the rear surfaces of the LEDs (8) toward the transparent substrate (1), and light irradiated in the direction from the rear surfaces of the LEDs (8) toward the transparent substrate (1) is reflected by the reflection part (9) to become light toward the observation surface when the LEDs (8) are lighted, whereby a decrease in brightness with respect to the observation surface can be suppressed.

Inventors

YOSHII KATSUMASA
Yanagami Tomomi

Assignees

阿尔卑斯阿尔派株式会社

Dates

Publication Date: 20260508
Application Date: 20251029
Priority Date: 20241105

Claims (12)

1. A light emitting structure of a transmissive display, comprising: a plurality of groups of electrodes arranged in an array; a plurality of light sources having light transmittance, disposed across the electrodes of each group with respect to the electrodes of the plurality of groups, and The reflection unit is disposed on an optical path in a direction from a portion of the back surface of the light source facing the gap between the electrodes toward the transparent substrate, and is disposed in a target region including a region for shielding the optical path.
2. The light-emitting structure of the transmissive display device of claim 1, The light emitting structure of the transmissive display has a laminated structure including the transparent substrate and an insulating layer, The reflection portion is formed in the same layer as the layer in which the plurality of sets of electrodes are formed, in a gap between the electrodes of the respective sets.
3. The light-emitting structure of the transmissive display device of claim 1, The light emitting structure of the transmissive display has a laminated structure including the transparent substrate and an insulating layer, The reflection part is formed in a layer different from the layer in which the plurality of sets of electrodes are formed.
4. A light-emitting structure of a transmissive display device as claimed in claim 3, The reflecting portion is a wiring electrode different from the plurality of sets of electrodes.
5. The light-emitting structure of the transmissive display device of claim 4, The target region in which the wiring electrode is formed is a rectangular region having edges in a1 st direction and a 2 nd direction, the 1 st direction being a direction connecting the electrodes, the 2 nd direction being a direction orthogonal to the 1 st direction, The length of the target region in the 1 st direction is longer than the length of the gap between the electrodes in the 1 st direction, and the length of the target region in the 2 nd direction is longer than the length of the gap between the electrodes in the 2 nd direction.
6. A light-emitting structure of a transmissive display device according to claim 2 or 3, The reflecting portion is a reflecting layer formed of a metal film, plate, film or sheet.
7. The light-emitting structure of the transmissive display device of claim 6, The object region in which the reflective layer is formed is a rectangular region having edges in a1 st direction and a 2 nd direction, the 1 st direction being a direction connecting the electrodes, the 2 nd direction being a direction orthogonal to the 1 st direction, The length in the 1 st direction of the target region is equal to or less than the longer one of the maximum length between the edges in the 1 st direction of the pair of electrodes and the length in the 1 st direction of the light source, The length in the 2 nd direction of the target region is equal to or less than the longer one of the length in the 2 nd direction of the pair of electrodes and the length in the 2 nd direction of the light source.
8. A light-emitting structure of a transmissive display device as claimed in claim 3, The reflecting part is a reflecting layer formed by a metal film, plate, film or sheet, The object region in which the reflective layer is formed is a rectangular region having edges in a1 st direction and a 2 nd direction, the 1 st direction being a direction connecting the electrodes, the 2 nd direction being a direction orthogonal to the 1 st direction, The length of the target region in the 1 st direction is equal to or longer than the length of the gap between the electrodes in the 1 st direction, and is equal to or shorter than the longer one of the maximum length between the edges of the pair of electrodes in the 1 st direction and the length of the light source in the 1 st direction, The length in the 2 nd direction of the target region is equal to or longer than the length in the 2 nd direction of the gap between the electrodes, and is equal to or shorter than the longer one of the length in the 2 nd direction of the pair of electrodes and the length in the 2 nd direction of the light source.
9. The light-emitting structure of the transmissive display device of claim 6, The reflection part is a metal film formed on the front surface of the transparent substrate or the insulating layer.
10. The light-emitting structure of the transmissive display device of claim 6, The reflecting portion is a metal plate, a metal film, or a metal sheet formed on the back surface of the transparent substrate.
11. The light-emitting structure of a transmissive display device according to claim 6, further comprising: and a light shielding layer formed at a position farther than the reflecting layer when viewed from the light source.
12. A transmissive display provided with the light emitting structure as claimed in claim 1.

Description

Transmission type display and light-emitting structure thereof Technical Field The present disclosure relates to a transmissive display and a light emitting structure thereof. Background Conventionally, unlike a general display, a transmissive display configured to be transmissive to the rear is known. In the transmissive display, a plurality of light sources are arranged in an array on a transparent substrate, and a plurality of openings are provided without disposing electrodes or the like, so that light can be transmitted from the back surface to the front surface of the display through the openings. The ratio of the area of the opening to the area of 1 pixel is referred to as the aperture ratio, and the larger the aperture ratio is, the more background light can be introduced, and the display can be made to look more transparent. Among them, transmissive LED displays are expected to be applied to various applications because they can achieve a high transmittance of 70% or more. In the case of configuring a transmissive LED display, a technique called micro LED is preferably used in which LEDs used as light sources are miniaturized and arranged in an array. Fig. 8 is a diagram schematically showing the structure of a light emitting portion of a transmissive LED display. Fig. 8 (a) shows a state of the light emitting portion of the transmissive LED display as viewed from the front side, and fig. 8 (b) shows a state of the light emitting portion of the transmissive LED display as viewed from the rear side. As shown in fig. 8 (a), the plurality of LEDs 101 are arranged in an array, and the plurality of openings 102 are arranged in an array so as to be adjacent to the plurality of LEDs 101. The LEDs 101 are arranged between the anode electrode 103 and the cathode electrode 104, respectively. In the transmissive LED display having such a configuration, as shown in fig. 8 (b), light of the LED101 that emits light to map information on the front surface leaks out to the rear surface from the gap between the anode electrode 103 and the cathode electrode 104. However, there is a problem in that light emitted from the LED101 to the back surface different from the front surface observation surface directly emits light on the back surface of the transmissive LED display, and thus, the light becomes lost light which does not contribute to the brightness on the observer side. That is, the micro LED element is generally manufactured by growing a semiconductor thin film on a sapphire substrate by epitaxial growth. Since sapphire and a semiconductor thin film have high transmittance, light emitted from the inside of the element is emitted in all directions. In the transmissive LED display, both the substrate disposed on the front side and the substrate disposed on the back side of the LED101 are made of transparent substrates. Therefore, when the LED101 is turned on, light passing through the gap between the electrodes 102 and 103 from the back surface of the LED101 further transmits through the transparent substrate and leaks out to the back surface of the display. Therefore, there is a problem that the light utilization efficiency is lowered due to the light leaked to the back surface, and the brightness with respect to the observation surface is lowered. In addition, a technique is known in which a wiring pattern of a circuit board on which an LED chip is mounted is formed of a material having light reflectivity (for example, aluminum) so that light emitted from the back surface side of the LED chip can be extracted to the front surface side (for example, refer to patent document 1). Prior art literature Patent literature Patent document 1 Japanese patent application laid-open No. 2012-204370 Disclosure of Invention Problems to be solved by the invention The present disclosure has been made to solve the above-described problems, and an object of the present disclosure is to suppress a decrease in brightness for an observation surface due to light irradiated to a back surface of a display through a gap between electrodes when a light source is turned on in a transmissive display. Means for solving the problems In order to solve the above problems, a light emitting structure of a transmissive display according to the present disclosure includes a plurality of groups of electrodes arranged in an array, a plurality of light sources having light transmittance, each group of electrodes being arranged across the electrodes of each group, and a reflection unit disposed in an object region including a region that blocks the light path on a light path in a direction from a portion of a back surface of the light source facing a gap between the electrodes toward a transparent substrate. Effects of the invention According to the present disclosure configured as described above, in the transmissive display, when the light source is turned on, light irradiated in a direction from the back surface of the light source toward the trans