KR20060097182A - Display apparatus - Google Patents

Abstract

A dual display device capable of displaying an image on both sides is disclosed. The dual display device includes a substrate assembly including a first substrate and a second substrate facing the first substrate, at least one or more first transparent electrodes formed on the first substrate, and an entire surface of the second substrate to face the first transparent electrode. A second transparent electrode formed over, a first reflective layer formed on a portion of the first substrate and reflecting light transmitted through the second transparent electrode, and a second disposed on a portion corresponding to the rest of the first reflective layer on the second substrate A second reflective layer and a liquid crystal layer interposed between the first and second substrates. Therefore, as the image is displayed on both sides as one display panel, the structure of the display device is simplified and the power consumption of the display device is reduced.

Description

Display device {DISPLAY APPARATUS}

1 is a plan view of a display device according to an exemplary embodiment of the present invention.

FIG. 2 is a cross-sectional view of the display device illustrated in FIG. 1 taken along line II ′.

3 is a cross-sectional view of a display device according to another exemplary embodiment of the present invention.

4 is a cross-sectional view of a display device according to still another embodiment of the present invention.

5 is a cross-sectional view of a display device according to still another embodiment of the present invention.

Explanation of symbols on the main parts of the drawings

100: display device 110: substrate assembly

111: first substrate 112: second substrate

120: pixel electrode 130: common electrode

140: first reflective layer 150: second reflective layer

160 liquid crystal layer 170 light source assembly

The present invention relates to a display device. More particularly, the present invention relates to a dual display device capable of displaying an image on both sides.

In general, a cellular phone has a flip-type display panel in which an image display liquid crystal display panel is exposed to the outside, and a liquid crystal display panel and a key input unit for manipulating the cellular phone are connected to each other so that the liquid crystal display panel and the key input unit face each other. There is a clamshell.

The folding type is classified into a general folding type and a dual folding type according to the number of liquid crystal display panels. The dual clamshell type has a main liquid crystal display panel displaying a main image and a sub liquid crystal display panel displaying a standby image, for example, time, date, reception sensitivity, and the like.

Accordingly, a display device mounted on a foldable cellular phone including main and sub liquid crystal display panels has two display panels, so that the overall thickness of the display device increases and power consumption of the display device increases. .

Accordingly, it is an object of the present invention to substantially eliminate one or more problems and limitations of the prior art.

One object of the present invention is to provide a display device capable of reducing thickness and power consumption.

According to an aspect of the present invention, a display device includes a substrate assembly, a first transparent electrode, a second transparent electrode, a first reflective layer, a second reflective layer, and a liquid crystal layer. The substrate assembly includes a first substrate and a second substrate facing the first substrate. At least one first transparent electrode is formed on the first substrate. A second transparent electrode is formed over the entire surface of the second substrate to face the first transparent electrode. The first reflective layer is formed on a part of the first substrate and reflects the light transmitted through the second transparent electrode. The second reflective layer is disposed on the second substrate at a portion corresponding to the rest of the first reflective layer. The liquid crystal layer is interposed between the first and second substrates.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a plan view illustrating a display device according to an exemplary embodiment of the present invention. FIG. 2 is a cross-sectional view taken along line II ′ of FIG. 1.

1 and 2, the display device 100 according to an exemplary embodiment of the present invention may include a substrate assembly 110, a first transparent electrode 120, a second transparent electrode 130, and a first reflective layer 140. ), A second reflective layer 150, and a liquid crystal layer 160.

The substrate assembly 100 includes a first substrate 111 and a second substrate 112 opposite the first substrate 111.

The first substrate 111 is a switching element for applying a signal for realizing an image to the first transparent electrode 120 to be described later, the gate lines 210 electrically connected to the switching element and the switching element electrically. It may include connected data lines 220.

In this embodiment, the gate lines 210 have a stripe shape. Hereinafter, a direction in which the gate lines 210 extend is defined as a first direction. The data lines 220 also have a stripe shape and extend in a second direction substantially perpendicular to the first direction. Hereinafter, an area formed by a pair of gate lines 210 adjacent to each other and a pair of data lines 220 adjacent to each other will be defined as a pixel area.

The switching element includes, for example, a thin film transistor (TFT). When the switching element includes a TFT, the TFT is turned on to a gate electrode electrically connected to the gator line 210, a source electrode electrically connected to the data line 220, a drain electrode spaced apart from the source electrode, and a gate electrode. An active layer transfers a data signal applied to a data line from a source electrode to a drain electrode according to a turn-on signal.

The first transparent electrode 120 is disposed in each pixel area formed on the first substrate 111. The first transparent electrode 120 is electrically connected to the drain electrode, and receives a data signal applied to the data line through the drain electrode.

The first reflective layer 140 is disposed in a portion of the pixel region formed on the first substrate 111. The first reflective layer 140 reflects the light incident through the second substrate 112 to the second substrate 112. Hereinafter, an area in which the first reflective layer 140 is formed will be defined as a first reflective area.

Therefore, the display device displays an image on a surface of the second substrate facing the liquid crystal layer using light reflected by the first reflective layer. The surface of the second substrate facing the liquid crystal layer will be defined as the first display surface.

In this embodiment, the first reflective layer 140, for example, is disposed on the first transparent electrode 120, and the planar area of the first reflective layer 140 is, for example, the first transparent electrode 120. It is desirable to be smaller than the planar area of. Examples of the material forming the first reflective layer 140 may include a metal having a high reflectance such as aluminum (Al), silver (Ag), or aluminum-neodymium (AlNd).

The second transparent electrode 130 faces the first transparent electrode 120 and is formed over the entire surface of the second substrate 112. The common voltage is applied to the second transparent electrode 130. An electric field is formed between the first and second transparent electrodes 120 and 130 by the data voltage applied to the first transparent electrode 120 and the common voltage applied to the second transparent electrode 130.

Examples of the material constituting the first and second transparent electrodes 120 and 130 include indium tin oxide (ITO), indium zinc oxide (IZO), zinc oxide (ZO), and the like. The same transparent conductive material is mentioned.

The second reflective layer 150 is disposed on the second substrate 112. The second reflective layer 150 is formed in a portion of the pixel area corresponding to the rest of the first reflective layer 140. The region in which the second reflective layer 150 is formed is defined as a second reflective region. In the present embodiment, the second reflective layer 150 is disposed on the second transparent electrode 130. Alternatively, the second reflective layer 150 may be disposed between the second transparent electrode 130 and the second substrate 112.

The second reflective layer 150 reflects the light passing through the liquid crystal layer 160 after passing through the first substrate 111. Accordingly, the display device displays an image on a surface of the first substrate facing the liquid crystal layer by the second reflective layer. The surface of the first substrate that faces the liquid crystal layer is defined as the second display surface.

The liquid crystal layer 160 is interposed between the first substrate 111 and the second substrate 112.

Accordingly, in the display device according to the exemplary embodiment, the pixel area is divided into a first reflection area and a second reflection area so that a display device having one display panel faces the first display surface and the second display surface. Display the video.

3 is a cross-sectional view illustrating a display device according to another exemplary embodiment of the present invention. Since the display device according to another exemplary embodiment of the present invention has substantially the same configuration as the display device illustrated in FIGS. 1 and 2 except for the first reflective layer, a redundant description thereof will be omitted. Therefore, the same reference numerals and names will be given to components that are substantially the same as the components of the display device illustrated in FIGS. 1 and 2.

Referring to FIG. 3, a display device 100 according to another exemplary embodiment of the present invention may include a substrate assembly 110, a first transparent electrode 120, a second transparent electrode 130, a first reflective layer 140, and a first reflective layer 140. 2 includes a reflective layer 150 and a liquid crystal layer 160.

In the present embodiment, the first reflective layer 140 is disposed on the bottom surface of the first substrate 111. Alternatively, the first reflective layer 140 may be interposed between the first substrate 111 and the first transparent electrode 120.

4 is a cross-sectional view illustrating a display device according to still another embodiment of the present invention. Since the display device according to another exemplary embodiment of the present invention has the substantially same configuration as the display device illustrated in FIGS. 1 and 2 except for the light source assembly, a redundant description thereof will be omitted. Therefore, the same reference numerals and names will be given to components that are substantially the same as the components of the display device illustrated in FIGS. 1 and 2.

Referring to FIG. 4, the display device 100 according to another exemplary embodiment of the present invention may include a substrate assembly 110, a first transparent electrode 120, a second transparent electrode 130, a first reflective layer 140, The second reflective layer 150 and the liquid crystal layer 160 are included. In addition, the display device 100 further includes a light source assembly 170.

In the present embodiment, the first reflective layer 140 and the second reflective layer 150 are formed in part of the pixel region. Hereinafter, an area in which the first and second reflective layers 140 and 150 are formed will be defined as a reflective area. In addition, the rest of the pixel areas except for the reflection area will be defined as a transmission area.

The light source assembly 170 is disposed under the first substrate. The light source assembly 170 provides light to the display device 100. The light source assembly 170 includes a light source 171 and a light guide plate 173. The light source assembly 170 may optionally further include a third reflective layer 175.

The light source 171 generates light. Light source 171 includes, for example, a cold cathode tube lamp. In the present embodiment, the light source 171 may be disposed at the periphery of the display device 100.

The light guide plate 173 improves the brightness uniformity of the light emitted from the light source 171. The light guide plate 173 has a rectangular parallelepiped plate shape, for example. Thus, the light guide plate has four sides, a light reflection surface 173a connected to the four sides, and a light exit surface 174b opposite the light reflection surface 173a.

A reflection pattern may be formed on the light reflection surface 173a. The reflection pattern guides the light emitted from the light source 171 toward the first substrate 111. The reflection pattern is formed to have a triangular column shape, for example.

 In this embodiment, the reflection pattern is formed corresponding to the reflection area. Alternatively, the reflection pattern may be formed corresponding to both the reflection area and the transmission area.

The light source assembly 170 may further include a third reflective layer 175. When the reflective pattern is formed in the reflective region, a third reflective layer may be disposed on the light guide plate 173 corresponding to the transmissive region. The third reflective layer 175 reflects the light provided from the light source 171 toward the first substrate 111.

The first light L1 emitted from the light source 171 is reflected by the third reflecting plate 175 disposed in the transmission region, and then passes through the first substrate 111, the liquid crystal layer 160, and the second substrate 111. It is emitted. Meanwhile, the external light L3 incident from the outside of the display device is reflected by the first reflective layer 140 through the second substrate 112 and the liquid crystal layer 160. Thereafter, the external light passes through the liquid crystal layer 160 and the second substrate 112 again and exits. Therefore, the display device displays an image on the first display surface.

The second light L2 emitted from the light source 171 travels toward the first substrate by the reflection pattern of the light guide plate 173 disposed in the reflection area, passes through the liquid crystal layer 160, and then the second reflection layer 130. ) And is reflected through the first substrate 111 again. Thus, the display device displays an image on the second display surface.

5 is a cross-sectional view illustrating a display device according to another exemplary embodiment of the present invention.

Referring to FIG. 5, the display device 100 according to another exemplary embodiment of the present invention may include a substrate assembly 110, a first transparent electrode 120, a second transparent electrode 130, a first reflective layer 140, The second reflective layer 150 and the liquid crystal layer 160 are included. In addition, the display device 100 further includes a light source assembly 170.

In the present embodiment, the first reflective layer 140 and the second reflective layer 150 are formed in part of the pixel region. The region in which the first and second reflective layers 140 and 150 are formed is defined as a reflective region. In addition, the remaining areas of the pixel area except for the reflective area are defined as the transmission area.

The light source assembly 170 is disposed under the first substrate. The light source assembly 170 provides light to the display device 100. The light source assembly 170 includes a light source 171 and a light guide plate 173. The light source assembly 170 may optionally further include a third reflective layer 175.

The light source 171 generates light. The light source 171 is, for example, a cold cathode tube lamp. In the present embodiment, the light source 171 may be disposed at the periphery of the display device 100.

The light guide plate 173 improves the brightness uniformity of the light emitted from the light source 171. The light guide plate 173 is disposed corresponding to the transmission region. The light guide plate 173 has a rectangular parallelepiped plate shape, for example. Thus, the light guide plate has four sides, a light reflection surface 173a connected to the four sides, and a light exit surface 174b opposite the light reflection surface 173a.

The light source assembly 170 may further include a fourth reflective layer 174. The fourth reflective layer 174 may be disposed on the lower side of the light guide plate 173 corresponding to the transmission region. The fourth reflective layer 174 reflects the light provided from the light source 171 toward the first substrate 111.

Although not illustrated, a reflective pattern may be formed on the light reflection surface 173a of the light guide plate 173. The reflective pattern guides the light emitted from the light source 171 toward the first substrate 111. When the reflective pattern is formed on the light guide plate 173, the fourth reflective layer 174 may be omitted.

The first light L1 emitted from the light source 171 is reflected by the fourth reflective layer 174 disposed in the transmissive region and passes through the first substrate 111, the liquid crystal layer 160, and the second substrate 112. It is emitted. Meanwhile, external light incident from the outside of the display device is reflected by the first reflective layer 140 through the second substrate 112 and the liquid crystal layer 160. Thereafter, the external light passes through the liquid crystal layer 160 and the second substrate 112 again and exits. Therefore, the display device displays an image on the first display surface.

The second light L2 emitted from the light source is irradiated toward the first substrate 111 by the reflective pattern of the fourth reflective layer 174 or the light guide plate 173 disposed in the reflective region, and passes through the liquid crystal layer 160. After that, the light is reflected by the second reflective layer 150 and is emitted through the first substrate 111 again. Thus, the display device displays an image on the second display surface.

As described in detail above, according to the present invention, by displaying an image toward the first and second display surfaces with one display device, the display device has a simple structure. Therefore, the thickness of the display device is reduced as compared with a double-side display device having two display panels.

In addition, by driving one display panel, power consumption of the display device can be reduced.

In the detailed description of the present invention described above with reference to the preferred embodiments of the present invention, those skilled in the art or those skilled in the art having ordinary skill in the art will be described in the claims to be described later It will be understood that various modifications and variations can be made in the present invention without departing from the scope of the present invention.

Claims (9)

A substrate assembly comprising a first substrate and a second substrate facing the first substrate; At least one first transparent electrode formed on the first substrate; A second transparent electrode formed over the entire surface of the second substrate so as to face the first transparent electrode; A first reflective layer formed on a portion of the first substrate and reflecting light transmitted through the second transparent electrode; A second reflective layer on the second substrate, the second reflective layer being disposed in a portion corresponding to the rest of the first reflective layer; And And a liquid crystal layer interposed between the first and second substrates. The display device of claim 1, wherein the first reflective layer is disposed on the first transparent electrode. The display device of claim 1, wherein the second reflective layer is disposed on the second transparent electrode. The display device of claim 1, wherein the first reflective layer is disposed on a surface of the first substrate that faces the liquid crystal layer. The light emitting device of claim 1, further comprising a light source assembly disposed under the first substrate and generating light, wherein the light source assembly transmits the light generated from the light source assembly through the second substrate. And a reflection area for reflecting the light is formed. The display device of claim 5, wherein the light source assembly comprises a light source and a light guide plate, and the light guide plate is disposed to cover the transmission area and the reflection area. The display device of claim 6, wherein a reflection pattern is formed on the light guide plate to reflect light generated from the light source. The display device of claim 5, wherein the light source assembly further includes the third reflective layer, and the third reflective layer corresponds to the reflective region. The display device of claim 5, wherein the light source assembly comprises a light source, a light guide plate, and a fourth reflective layer, and the light guide plate is disposed to cover the transmission area.

Images