US-20260126694-A1 - DISPLAY DEVICE

US20260126694A1US 20260126694 A1US20260126694 A1US 20260126694A1US-20260126694-A1

Abstract

This display device comprises a first panel, comprising a plurality of pixels each comprising a light-emitting area and a light-transmitting area for transparent display, and a second panel, comprising cell areas corresponding respectively to the plurality of pixels in the first panel to control the light blocked to the first panel. The cell area of the second panel comprises a light-blocking control unit. The light-blocking control unit comprises: a first light-blocking control area that vertically overlaps the light-transmitting area and comprises at least one first transparent electrode; a second light-blocking control area that horizontally contacts the first light-blocking control area, vertically overlaps the light-emitting area, and comprises at least one second transparent electrode; and light-blocking particles that are charged to a first polarity and are dispersed in a space shared by the first light-blocking control area and the second light-blocking control area.

Inventors

Guido WOO
Jungnam An

Assignees

LG ELECTRONICS INC.

Dates

Publication Date: 20260507
Application Date: 20221005

Claims (20)

1 . A display device comprising: a first panel including a plurality of pixels, each including a light-emitting region and a transmission region, for a transparent display; and a second panel including a cell region corresponding to each of the plurality of pixels of the first panel for adjusting light-blocking of the first panel; wherein the cell region of the second panel includes a light-blocking adjustment part, and wherein the light-blocking adjustment part includes: a first light-blocking adjustment region vertically overlapping the transmission region and including at least one first transparent electrode; a second light-blocking adjustment region horizontally contacting the first light-blocking adjustment region and vertically overlapping the light-emitting region and including at least one second transparent electrode; and light-blocking particles that are charged with a first polarity and are dispersed in a space shared between the first light-blocking adjustment region and the second light-blocking adjustment region.
2 . The display device of claim 1 , wherein a first voltage is applied to the at least one first transparent electrode, wherein a second voltage is applied to the at least one second transparent electrode, wherein the first voltage and the second voltage are selectively applied according to a mode selected among a plurality of light-blocking adjustment modes, wherein the plurality of light-blocking adjustment modes include a first mode, a second mode, a third mode, a fourth mode, and a fifth mode, wherein the first mode is a light-blocking mode, wherein the second mode is a light-transmitting mode, wherein the third mode is a semi-light-transmitting mode, wherein the fourth mode is a light-transmitting variable mode, and wherein the fifth mode is a partial selection mode.
3 . The display device of claim 2 , wherein the first voltage is applied to the at least one first transparent electrode in the first mode, and wherein the first voltage has a second polarity opposite to the first polarity.
4 . The display device of claim 3 , wherein the second voltage is applied to the at least one second transparent electrode in the first mode, and wherein the second voltage is a voltage between 0 V and the first voltage.
5 . The display device of claim 3 , wherein the second voltage is applied to the at least one second transparent electrode in the first mode, and wherein the second voltage is a voltage having the same polarity as the first polarity.
6 . The display device of claim 2 , wherein the second voltage is applied to the at least one second transparent electrode in the second mode, and wherein the second voltage has a second voltage having a second polarity opposite to the first polarity.
7 . The display device of claim 6 , wherein the first voltage is applied to the at least one first transparent electrode in the second mode, and wherein the first voltage is a voltage having the same polarity as the first polarity.
8 . The display device of claim 2 , wherein the first light-blocking adjustment region includes a third electrode that applies a third voltage to an inner surface of the outer part thereof.
9 . The display device of claim 8 , wherein the third voltage in the first mode is a voltage having the same polarity as the second polarity.
10 . The display device of claim 8 , wherein the third voltage in the second mode is a voltage having the same polarity as the first polarity.
11 . The display device of claim 8 , wherein the first voltage, the second voltage, and the third voltage are each 0V in the third mode.
12 . The display device of claim 2 , wherein the first voltage is variable in the fourth mode.
13 . The display device of claim 2 , wherein the first transparent electrode includes a plurality of sub-electrodes that are horizontally spaced apart from each other, and wherein the first voltage is independently applied to the plurality of sub-electrodes.
14 . The display device of claim 2 , wherein the cell region of the second panel includes a pixel circuit, and wherein at least one of the first voltage or the second voltage is selectively applied to the light-blocking adjustment part of each of the plurality of pixels by the operation of the pixel circuit in the fifth mode.
15 . The display device of claim 1 , wherein the first transparent electrode and the second transparent electrode are horizontally spaced apart.
16 . The display device of claim 1 , wherein the area of the light-blocking adjustment part is the same as the area of the pixel, and wherein the area of the first light-blocking adjustment region is larger than the area of the transmission region.
17 . The display device of claim 16 , wherein the area of the first transparent electrode is larger than the area of the transmission region, and wherein the area of the second transparent electrode is smaller than the area of the light-emitting region.
18 . The display device of claim 1 , wherein the cell region of the second panel comprises: a first transparent substrate shared with the first panel; a second transparent substrate under the first transparent substrate; and the light-blocking adjustment part provided between the first transparent substrate and the second transparent substrate; and wherein the at least one first transparent electrode is disposed on at least one transparent substrate among the first transparent substrate or the second transparent substrate, and wherein the at least one second transparent electrode is disposed on at least one transparent substrate among the transparent substrate or the second transparent substrate.
19 . The display device of claim 1 , further comprising: an adhesive layer provided between the first panel and the second panel; wherein the second panel includes: a first transparent substrate under the adhesive layer; a second transparent substrate under the first transparent substrate; and a light-blocking adjustment part between the first transparent substrate and the second transparent substrate; wherein the at least one first transparent electrode is disposed on at least one transparent substrate among the first transparent substrate or the second transparent substrate, and wherein the at least one second transparent electrode is disposed on at least one transparent substrate among the transparent substrate or the second transparent substrate.
20 . The display device of claim 1 , wherein the light-emitting region includes a pixel circuit and a plurality of light-emitting layers connected to the pixel circuit and outputting different color lights.

Description

Technical Field An embodiment relates to a display device. BACKGROUND ART In recent years, there has been a rapid increase in demand for transparent display devices that allow users to view objects not only on the display panel but also behind the display panel. Meanwhile, in transparent display devices, since light is transmitted to the user through the display panel, there was a problem of reducing the contrast ratio because it was difficult to implement complete black. Schemes have been proposed to improve this contrast ratio. FIG. 1 illustrates a conventional transparent display having a black screen. As illustrated in FIG. 1, a black screen 7 that can be selectively positioned at the rear of the display panel 1 is provided, so that light is prevented from passing through the display panel 1 by the black screen 7, thereby improving the contrast ratio. If it is desired to clearly view the image object 3 on the display panel 1, a black screen 7 is positioned behind the display panel 1, and if it is desired to view the image object 3 on the display panel 1 and an external object 5 behind the display panel 1, the black screen 7 behind the display panel 1 is removed. However, there was a problem that the black screen 7 could not respond quickly when the movement of moving to the rear of the display panel 1 and then returning to the original position was frequently performed. In addition, there was a problem that the black screen 7 became thick as a physical product. FIG. 2 illustrates a conventional transparent display having an electrochromic layer. As illustrated in FIG. 2, an electrochromic layer 9 capable of adjusting transmittance is provided on the display panel 1, and the desired contrast ratio is implemented by adjusting the transmittance through the operation of the electrochromic layer 9. However, there are still many difficulties in selecting the material or physical configuration of the electrochromic layer 9, and in particular, there was a problem of difficulty in implementing it for large displays such as TVs. DISCLOSURE Technical Problem An object of an embodiment of the present disclosure is to solve the above-mentioned and other problems. Another object of the embodiment is to provide a display device capable of implementing a high contrast ratio. Another object of the embodiment is to provide a display device capable of implementing a high response speed for contrast ratio adjustment. Another object of the embodiment is to provide a display device capable of implementing a transparent display in various modes. The technical problems of the embodiment are not limited to those described in this section, but include those that can be understood through the description of the disclosure. Technical Solution According to one aspect of the embodiment to achieve the above or other objects, a display device includes a first panel including a plurality of pixels, each including a light-emitting region and a transmission region, for a transparent display; and a second panel including a cell region corresponding to each of the plurality of pixels of the first panel for adjusting light-blocking of the first panel; in which the cell region of the second panel includes a light-blocking adjustment part, and the light-blocking adjustment part includes a first light-blocking adjustment region vertically overlapping the transmission region and including at least one first transparent electrode; a second light-blocking adjustment region horizontally contacting the first light-blocking adjustment region and vertically overlapping the light-emitting region and including at least one second transparent electrode; and light-blocking particles that are charged with a first polarity and are dispersed in a space shared between the first light-blocking adjustment region and the second light-blocking adjustment region. A first voltage may be applied to the at least one first transparent electrode, a second voltage may be applied to the at least one second transparent electrode, the first voltage and the second voltage may be selectively applied according to a mode selected among a plurality of light-blocking adjustment modes, the plurality of light-blocking adjustment modes may include a first mode, a second mode, a third mode, a fourth mode, and a fifth mode, the first mode may be a light-blocking mode, the second mode may be a light-transmitting mode, the third mode may be a semi-light-transmitting mode, the fourth mode may be a light-transmitting variable mode, and the fifth mode may be a partial selection mode. The first voltage may be applied to the at least one first transparent electrode in the first mode, and the first voltage may have a second polarity opposite to the first polarity. The second voltage may be applied to the at least one second transparent electrode in the second mode, and the second voltage may have a second voltage having a second polarity opposite to the first polarity. The first light-block