KR20140127582A - Display device and manufacturing method thereof - Google Patents

Abstract

Provided is a display device which includes a display panel which includes sub pixels formed between a lower substrate and an upper substrate; a polarizing plate formed on the inner surface of the upper substrate; and a planarization layer which is formed on the polarizing plate, corrects the nonuniform surface of the polarizing plate to be flat.

Description

DISPLAY DEVICE AND MANUFACTURING METHOD THEREOF [0002]

An embodiment of the present invention relates to a display device and a method of manufacturing the same.

As the information technology is developed, the market of display devices, which is a connection medium between users and information, is getting larger. Accordingly, a liquid crystal display (LCD), an organic light emitting diode (OLED), an electrophoretic display (EPD), and a plasma display panel (PDP) ) Have been increasingly used.

Among the display devices described above, a liquid crystal display device, an organic light emitting display device, and an electrophoretic display device are being studied to realize a flexible display device, and some of them are implemented as a stereoscopic image display device.

A liquid crystal display device, an organic electroluminescence display device, or the like includes a polarizing plate attached to an external display surface (e.g., an outer surface of an upper substrate constituting a display panel) of the display panel. The polarizing plate plays a role of polarizing the light emitted from the display panel or preventing deterioration of visibility due to light incident from the outside.

On the other hand, recently, a method has been proposed in which a polarizing plate is attached to an inner display surface (e.g., an inner surface of an upper substrate constituting a display panel) rather than an outer display surface of the display panel. However, in the case of attaching the polarizing plate to the inner display surface of the display panel, there is a problem that the flatness of the flat plate is nonuniform and display unevenness (unevenness such as wave pattern) occurs when displaying an image, do.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems of the background art by improving the surface uniformity and flatness of a polarizing plate when a polarizing plate is formed on the inner surface of a display panel, thereby solving the problem of display unevenness Or a display device capable of preventing the above-mentioned problems.

According to an aspect of the present invention, there is provided a display device comprising: a display panel including subpixels formed between a lower substrate and an upper substrate; A polarizer formed on the inner surface of the upper substrate; And a flattening layer formed on the polarizing plate and compensating for the non-uniform surface of the polarizing plate to flatten it.

The planarization layer may be a selected one of organic film or organic / inorganic composite film.

The display panel may include an alignment film formed on the planarization layer.

The display panel may include a pattern reliader film positioned between the polarizer and the upper substrate and having a first pattern region and a second pattern region for separating an image formed by sub-pixels into a left eye and a right eye.

The display panel may include a black stripe formed between the pattern relief film and the upper substrate and corresponding to a boundary between the first pattern region and the second pattern region.

In another aspect, an embodiment of the present invention is directed to a method of forming a subpixel comprising: forming subpixels on a lower substrate; Forming a polarizer on the inner surface of the upper substrate; Forming a planarizing layer on the polarizing plate to compensate for the non-uniform surface of the polarizing plate to flatten the polarizing plate; And attaching the lower substrate and the upper substrate to each other to manufacture a display panel.

The step of forming the planarization layer may be a slit coating method or a spin coating method.

The polarizing plate and the planarizing layer may be formed by forming a polarizing plate corresponding to the front surface of the upper substrate and forming a planarizing layer corresponding to the front surface of the polarizing plate, It can be removed at the same time.

The planarization layer can be cured by ultraviolet light.

The planarization layer may be a selected one of organic film or organic / inorganic composite film.

The display panel may include an alignment film formed on the planarization layer.

The display panel may include a patterned retarder film positioned between the polarizer and the upper substrate and having a first region and a second region for separating an image formed by the subpixels into a left eye and a right eye.

And a black stripe positioned between the patterned retarder film and the upper substrate and formed corresponding to the first region and the second region.

The present invention relates to a polarizing plate for improving the display uniformity and flatness of the polarizing plate when the polarizing plate is formed on the inner surface of the display panel, thereby improving or preventing the problem of display unevenness (unevenness such as wavy patterns) There is an effect of providing a display device. In addition, the present invention has the additional effect of increasing both the surface uniformity and the flatness of the polarizing plate as well as the flatness of the alignment film.

1 is a schematic configuration diagram of a display device;
2 is a sectional view of a display panel according to a first embodiment of the present invention;
3 is a cross-sectional view of a display panel according to a second embodiment of the present invention.
4 is a sectional view of a display panel according to a third embodiment of the present invention;
5 is a cross-sectional view of a polarizer and a planarization layer according to the structure of the present invention.
Fig. 6 is a diagram showing images displayed on the display surface of the comparative example and the display surface of the present invention. Fig.
7 to 10 are views for explaining a method of forming a planarization layer on a polarizing plate according to a fourth embodiment of the present invention.
11 to 14 are views for explaining a method of forming a planarization layer on a polarizing plate according to a fifth embodiment of the present invention.
Figs. 15 and 16 are exemplary views of a display panel manufactured by the fourth and fifth embodiments. Fig.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a schematic configuration diagram of a display device.

As shown in FIG. 1, a display device includes an image supply unit (SBD), a timing control unit (TCN), a driving unit (DRV), and a display panel (PNL).

The image supply unit SBD supports a two-dimensional mode (2D mode), a three-dimensional mode (3D mode) or a two-dimensional mode (2D mode) and a three-dimensional mode (3D mode). The image supply unit (SBD) generates 2D image frame data in a two-dimensional mode (2D mode) and 3D image frame data in a three-dimensional mode (3D mode). The image supply unit SBD supplies the timing control unit TCN with timing signals and video frame data such as a vertical synchronization signal Vsync, a horizontal synchronization signal Hsync, a data enable signal DE and a main clock do. The image supply unit SBD is selected in the 2D or 3D mode according to the user's selection input through the user interface, generates image frame data corresponding thereto, and supplies the image frame data to the timing control unit TCN. The user interface includes user input means such as an OSD (On Screen Display), a remote controller, a keyboard, and a mouse.

The timing controller TCN receives 3D image frame data including the 2D image frame or the left eye image frame data and the right eye image frame data from the image supply unit SBD. In the two-dimensional mode, the timing control unit TCN supplies the 2D image frame data to the driving unit DRV at a frame frequency of 50 Hz to 60 Hz or the like. In the three-dimensional mode, the timing controller TCN alternately supplies the left eye image frame data and the right eye image frame data to the driver DRV at a frame frequency of 120 Hz or more. In addition, the timing control unit TCN supplies a control signal corresponding to the image frame data to the driving unit DRV.

The driving unit DRV includes a data driver connected to the data lines and supplying a data signal, and a scan driver connected to the scan lines to supply a scan signal. The data driver included in the driver DRV converts digital frame data into analog frame data under the control of the timing controller TCN and supplies the frame data to the data lines. In addition, the scan driver included in the driver DRV sequentially supplies the scan signals to the scan lines under the control of the timing controller TCN.

The display panel PNL receives a scan signal and a data signal from the driver DRV and displays a 2D image or a 3D image corresponding thereto. The display panel PNL may be implemented as one of an organic light emitting display panel, an electrophoretic display panel, and a liquid crystal display panel, but is not limited thereto. The display panel PNL may be a stereoscopic image display panel including a 3D film for separating a 3D image into a left eye image and a right eye image together with the display panel arranged in the foregoing. On the other hand, the above-described display panel is different from the configuration formed on the lower substrate and the configuration formed on the upper substrate for each device characteristic. However, the present invention can be applied to a display panel (PNL) to which a polarizing plate is attached (or required), and a specific example thereof is the same as the following embodiment.

Hereinafter, the description of the present invention will be described with reference to cross-sectional views of display panels according to embodiments of the present invention.

2 is a cross-sectional view of a display panel according to the first embodiment of the present invention. 2 is a cross-sectional view of a region X1 - X2 in FIG.

≪ Embodiment 1 >

2, a display panel PNL according to the first embodiment of the present invention includes a lower substrate 110a, an upper substrate 110b, sub-pixels SP, a polarizer 150, and a planarization layer 160).

Subpixels SP are formed between the lower substrate 110a and the upper substrate 110b. According to the first embodiment of the present invention, the sub-pixels SP include a switching transistor, a capacitor, a driving transistor, and an organic light emitting diode. That is, the display panel PNL is implemented as an organic light emitting display panel for displaying a 2D image.

The role of the elements included in the sub-pixels SP will be briefly described as follows. The switching transistor serves to transfer the data signal to the capacitor in response to the scan signal. The capacitor serves to store the data signal transferred from the switching transistor as a data voltage. The driving transistor serves to generate a driving current corresponding to the data voltage. The organic light emitting diode emits light corresponding to the driving current.

On the other hand, in the case of the subpixels SP constituting the organic light emitting display panel, a compensation circuit for preventing the lifetime and deterioration of the transistors and the like is included. In the above description, it is assumed that the subpixels SP are composed of 2T (Transistor) 1C (Capacitor). However, when a compensation circuit is included, transistors and capacitors are further included such as 3T1C, 4T2C, 5T2C, 6T2C, and the like.

The polarizer 150 is formed on the inner surface of the upper substrate 110b. The polarizer 150 may be formed in the form of a film and may be formed on the inner surface of the upper substrate 110b by a laminating method. The polarizing plate 150 includes a retardation film and a polarizing film disposed on the retardation retardation film. Here, the phase retardation film may have an optical axis having a phase difference of? / 4 with respect to the incident light, and the polarizing film may have an absorption axis that polarizes the unpolarized light.

The planarizing layer 160 is formed on the polarizing plate 150. The planarization layer 160 serves to compensate for the non-uniform surface of the polarizer 150 to make it flat. Generally, in the case of the polarizing plate 150 formed on the inner surface of the upper substrate 110b by the laminating method, the flatness of the exposed upper surface is nonuniform, and display unevenness (wavy pattern or the like) occurs when an image is displayed. However, if the flattening layer 160 is formed on the upper surface of the polarizing plate 150, the flatness of the polarizing plate 150 can be increased to improve or prevent display unevenness formed by the nonuniform surface of the polarizing plate 150 .

On the other hand, the planarization layer 160 may be formed of a selected one of an organic film or an organic / inorganic composite film having translucency (or transparency) that does not lower the transmittance of light emitted from the subpixels SP. However, in the case of the planarization layer 160, an inorganic film may be substituted if a deposition method or material capable of increasing the uniformity is selected.

As described above, in the first embodiment of the present invention, when the polarizing plate 150 is formed on the inner surface of the organic light emitting display panel, it is possible to improve or even prevent the degradation of the display quality by increasing the surface uniformity and flatness of the polarizing plate 150 There is an effect of providing a display device capable of displaying an image.

≪ Embodiment 2 >

3 is a cross-sectional view of a display panel according to a second embodiment of the present invention. 3 is an exemplary cross-sectional view of the region X1 - X2 in FIG.

3, the display panel PNL according to the second embodiment of the present invention includes a lower substrate 110a, an upper substrate 110b, sub-pixels SP, a polarizer 150, a planarization layer 160, orientation films 170a, 170b, a liquid crystal layer 140, and a backlight unit (not shown).

Subpixels SP are formed between the lower substrate 110a and the upper substrate 110b. According to the second embodiment of the present invention, the sub-pixels SP include a switching transistor, a capacitor, and a liquid crystal. That is, the display panel PNL is implemented as a liquid crystal display panel for displaying a 2D image.

The role of the elements included in the sub-pixels SP will be briefly described as follows. The switching transistor serves to transfer the data signal to the capacitor in response to the scan signal. The capacitor serves to store the data signal transferred from the switching transistor as a data voltage.

On the other hand, in the case of the subpixels SP constituting the liquid crystal display panel, the light emitted from the backlight unit is adjusted as the liquid crystal located between the pixel electrode and the common electrode forming the electric field corresponding to the data voltage is tilted. The liquid crystals of the subpixels SP may be driven by a vertical field driving method such as TN (Twisted Nematic) mode and VA (Vertical Alignment) mode or the like such as IPS (In Plane Switching) mode and FFS And a horizontal electric field driving system. However, the liquid crystal mode of the sub-pixels SP may be implemented in any mode as well as the TN mode, the VA mode, the IPS mode, and the FFS mode.

On the other hand, in the case of the sub-pixels SP constituting the liquid crystal display panel, a color filter (not shown) and an overcoat layer (not shown) are formed on the upper substrate 110b. The color filter serves to convert the light emitted from each region of the subpixels SP into red, green, and blue. The overcoat layer is formed on the color filter and serves to keep the surface flat. A color filter and an overcoat layer may be formed between the polarizer 150 and the upper substrate 110b.

The polarizer 150 is formed on the inner surface of the upper substrate 110b. For example, the polarizer 150 may be formed on the overcoat layer or directly on the inner surface of the upper substrate 110b if the overcoat layer is omitted. The polarizer 150 may be formed in the form of a film and may be formed on the inner surface of the upper substrate 110b by a laminating method. The polarizing plate 150 includes a retardation film and a polarizing film disposed on the retardation retardation film. Here, the phase retardation film may have an optical axis having a phase difference of? / 4 with respect to the incident light, and the polarizing film may have an absorption axis that polarizes the unpolarized light.

The planarizing layer 160 is formed on the polarizing plate 150. The planarization layer 160 serves to compensate for the non-uniform surface of the polarizer 150 to make it flat. Generally, in the case of the polarizing plate 150 formed on the inner surface of the upper substrate 110b by the laminating method, the flatness of the exposed upper surface is nonuniform, and display unevenness (wavy pattern or the like) occurs when an image is displayed. However, if the flattening layer 160 is formed on the upper surface of the polarizing plate 150, the flatness of the polarizing plate 150 can be increased to improve or prevent display unevenness formed by the nonuniform surface of the polarizing plate 150 .

On the other hand, the planarization layer 160 may be formed of a selected one of an organic film or an organic / inorganic composite film having translucency (or transparency) that does not lower the transmittance of light emitted from the subpixels SP. In addition, the planarization layer 160 may be selected from the same material as the overcoat layer for convenience of processing and cost reduction. However, in the case of the planarization layer 160, an inorganic film may be substituted if a deposition method or material capable of increasing the uniformity is selected.

The alignment layers 170a and 170b include a lower alignment layer 170a formed on the upper portion of the subpixels SP and an upper alignment layer 170b formed on the upper portion of the planarization layer 160. [ The alignment films 170a and 170b serve to set the pre-tilt angle of the liquid crystal. Since the upper alignment layer 170b is formed on the planarization layer 160, the surface flatness is improved corresponding to the flatness of the planarization layer 160. When the surface flatness of the upper alignment layer 170b is improved, it is possible to enhance the straightness of the emitted light and to prevent the luminance from being lowered due to reflection of light.

The liquid crystal layer 140 is formed between the lower alignment layer 170a and the upper alignment layer 170b. The liquid crystal layer 140 may be formed by bonding the lower substrate 110a and the upper substrate 110b and then injecting them therebetween, but the present invention is not limited thereto.

As described above, the flattening layer 160 formed between the polarizing plate 150 and the upper alignment layer 170b improves or improves the flatness of the polarizing plate 150 and improves the display quality and improves or prevents display unevenness .

The second embodiment of the present invention has the problem that when the polarizer 150 is formed on the inner surface of the liquid crystal display panel, the uniformity and flatness of the surface of the polarizer 150 and the upper alignment film 170b are increased, There is an effect of providing a display device capable of improving or preventing the above problems.

≪ Third Embodiment >

4 is a cross-sectional view of a display panel according to a third embodiment of the present invention. 4 is a cross-sectional view of a region X1 - X2 in FIG.

4, the display panel PNL according to the third embodiment of the present invention includes a lower substrate 110a, an upper substrate 110b, subpixels SP, a patterned retarder film 180, A black stripe 190, a polarizing plate 150, a planarization layer 160, alignment layers 170a and 170b, a liquid crystal layer 140 and a backlight unit (not shown).

Subpixels SP are formed between the lower substrate 110a and the upper substrate 110b. According to the third embodiment of the present invention, the sub-pixels SP include a switching transistor, a capacitor, and a liquid crystal. That is, the display panel PNL is implemented as a liquid crystal display panel for displaying a 2D or 3D image. [The display panel (PNL) may be implemented by an organic light emitting display panel or the like for displaying a 2D or 3D image, but a description thereof will be omitted.

The role of the elements included in the sub-pixels SP will be briefly described as follows. The switching transistor serves to transfer the data signal to the capacitor in response to the scan signal. The capacitor serves to store the data signal transferred from the switching transistor as a data voltage.

On the other hand, in the case of the subpixels SP constituting the liquid crystal display panel, the light emitted from the backlight unit is adjusted as the liquid crystal located between the pixel electrode and the common electrode forming the electric field corresponding to the data voltage is tilted. The liquid crystals of the subpixels SP may be driven by a vertical field driving method such as TN (Twisted Nematic) mode and VA (Vertical Alignment) mode or the like such as IPS (In Plane Switching) mode and FFS And a horizontal electric field driving system. However, the liquid crystal mode of the sub-pixels SP may be implemented in any mode as well as the TN mode, the VA mode, the IPS mode, and the FFS mode.

On the other hand, in the case of the sub-pixels SP constituting the liquid crystal display panel, a color filter (not shown) and an overcoat layer (not shown) are formed on the upper substrate 110b. The color filter serves to convert the light emitted from each region of the subpixels SP into red, green, and blue. The overcoat layer is formed on the color filter and serves to keep the surface flat. A color filter and an overcoat layer may be formed between the polarizer 150 and the upper substrate 110b.

The patterned retarder film 180 is formed on the inner surface of the upper substrate 110b. The patterned retarder film 180 may be attached to the inner surface of the upper substrate 110b by an adhesive member. The patterned retarder film 180 serves to interlace the left eye image and the right eye image displayed on the display panel PNL in a line-by-line manner.

The patterned retarder film 180 includes a first pattern region 180R and a second pattern region 180L. The first and second pattern regions 180R and 180L may cause first polarized light, e.g., right circularly polarized light R, and second polarized light, e.g., left circularly polarized light L, but are not limited thereto. The first and second pattern regions 180R and 180L are partitioned by the scan lines of the subpixels SP of the display panel PNL. The patterned retarder film 180 is formed by using the retarder layer formed on the first and second pattern regions 180R and 180L so that odd lines are divided into right circularly polarized light R and even lines are divided into left circularly polarized light L and vice versa, And separates the image displayed on the display panel PNL into a left eye image and a right eye image.

A black stripe 190 is formed on the inner or outer surface of the upper substrate 110b. The black stripe 190 serves to prevent color mixture or crosstalk between upper and lower lines and lines (or upper and lower subpixels) when a 3D image is displayed through the subpixels SP. For this purpose, the black stripes 190 are formed corresponding to the boundaries of the first and second pattern regions 180R and 180L.

On the other hand, when the black stripe 190 is formed on the inner surface of the upper substrate 110b, it is formed between the patterned relief film 180 and the upper substrate 110b or on the upper portion of the pattern reliader film 180 do. Alternatively, when the black stripe 190 is formed on the outer surface of the upper substrate 110b, it may be directly above the outer surface of the upper substrate 110b or on the outer surface of the upper substrate 110b .

The black stripe 190 is formed by a printing method using an inkjet or a photolithography method. In the case of the black stripe 190, it is made of an opaque material such as black because it has to prevent transmission of light. The material of the black stripes 190 is determined according to the method of forming the black stripes 190. For example, the black stripes 190 may refer to inks, resins, and the like, but are not limited thereto.

The polarizer 150 is formed on the inner surface of the upper substrate 110b. For example, the polarizer 150 may be formed on the overcoat layer or directly on the inner surface of the upper substrate 110b if the overcoat layer is omitted. The polarizer 150 may be formed in the form of a film and may be formed on the inner surface of the upper substrate 110b by a laminating method. The polarizing plate 150 includes a retardation film and a polarizing film disposed on the retardation retardation film. Here, the phase retardation film may have an optical axis having a phase difference of? / 4 with respect to the incident light, and the polarizing film may have an absorption axis that polarizes the unpolarized light.

The planarizing layer 160 is formed on the polarizing plate 150. The planarization layer 160 serves to compensate for the non-uniform surface of the polarizer 150 to make it flat. Generally, in the case of the polarizing plate 150 formed on the inner surface of the upper substrate 110b by the laminating method, the flatness of the exposed upper surface is nonuniform, and display unevenness (wavy pattern or the like) occurs when an image is displayed. However, if the flattening layer 160 is formed on the upper surface of the polarizing plate 150, the flatness of the polarizing plate 150 can be increased to improve or prevent display unevenness formed by the nonuniform surface of the polarizing plate 150 .

On the other hand, the planarization layer 160 may be formed of a selected one of an organic film or an organic / inorganic composite film having translucency (or transparency) that does not lower the transmittance of light emitted from the subpixels SP. In addition, the planarization layer 160 may be selected from the same material as the overcoat layer for convenience of processing and cost reduction. However, in the case of the planarization layer 160, an inorganic film may be substituted if a deposition method or material capable of increasing the uniformity is selected.

The alignment layers 170a and 170b include a lower alignment layer 170a formed on the upper portion of the subpixels SP and an upper alignment layer 170b formed on the upper portion of the planarization layer 160. [ The alignment films 170a and 170b serve to set the pre-tilt angle of the liquid crystal. Since the upper alignment layer 170b is formed on the planarization layer 160, the surface flatness is improved corresponding to the flatness of the planarization layer 160. When the surface flatness of the upper alignment layer 170b is improved, it is possible to enhance the straightness of the emitted light and to prevent the luminance from being lowered due to reflection of light.

The liquid crystal layer 140 is formed between the lower alignment layer 170a and the upper alignment layer 170b. The liquid crystal layer 140 may be formed by bonding the lower substrate 110a and the upper substrate 110b and then injecting them therebetween, but the present invention is not limited thereto.

As described above, the flattening layer 160 formed between the polarizing plate 150 and the upper alignment layer 170b improves or improves the flatness of the polarizing plate 150 and improves the display quality and improves or prevents display unevenness .

The third embodiment of the present invention improves the surface uniformity and flatness of the polarizing plate 150 and the upper alignment layer 170b when the polarizing plate 150 is formed on the inner surface of the liquid crystal display panel for displaying stereoscopic images, There is an effect that it is possible to provide a display device capable of improving or preventing the problem of deterioration of display quality.

Hereinafter, the improvement of the structure of the present invention with respect to the structure of the comparative example will be described.

FIG. 5 is a cross-sectional view of a polarizing plate and a planarizing layer according to the structure of the present invention, and FIG. 6 is a diagram illustrating images displayed on the display surface of the comparative example and the display surface of the present invention.

5, the planarization layer 160 is formed on the polarizer 150 according to the structure of the present invention. In the case where only the polarizing plate 150 is formed, there is a portion depressed from the surface like "P1 " or protruding from the surface such as" P2 ". As described above, when the protruding or depressed portions P1 and P2 are present from the reference surface BL of the polarizing plate 150, non-uniform flatness is obtained. When an image is displayed on a display panel having this structure, display unevenness (unevenness such as a wavy pattern) occurs like "W1" in Fig. 6A. However, when the planarizing layer 160 is formed on the polarizing plate 150, the protruded or depressed portions P1 and P2 are covered (or filled) so that the non-uniform surface can be planarized. When an image is displayed on a display panel having this structure, display unevenness (unevenness such as a wavy pattern) is improved or disappears like "W2" in Fig. 7B.

Meanwhile, a method of manufacturing a display device having the polarizing plate 150 and the planarization layer 160 as in the structure of the present invention can be performed as follows. However, since various structures of the display panel have been described through the first to third embodiments described above, only the method of forming the planarization layer 160 on the polarizer 150 will be described below. Other structures accompanying the manufacturing method of the other display panel refer to the first to third embodiments.

<Fourth Embodiment>

FIGS. 7 to 10 are views for explaining a method of forming a planarization layer on a polarizing plate according to a fourth embodiment of the present invention. 7 to 10 are views for explaining a method of forming a polarizing plate and a planarizing layer on a unit substrate.

As shown in Fig. 7, an upper substrate 110b is prepared. The upper substrate 110b is made of a flat and transparent material such as glass.

As shown in FIG. 8, a polarizing plate 150 is formed on a first surface (a surface of the upper substrate 110b which becomes an inner surface when the upper substrate 110 is attached to the lower substrate) using a laminating method. At this time, the polarizer 150 is formed corresponding to the size of the upper substrate 110b.

As shown in FIG. 9, a selected one of an organic film or an organic / inorganic composite film is formed on the polarizing plate 150 using a slit coating method or a spin coating method. At this time, the selected material is formed corresponding to the size of the polarizer 150 or the upper substrate 110b. Then, the selected material is irradiated with ultraviolet rays (UV) and cured to form the planarization layer 160. However, in the case of the planarization layer 160, an inorganic film may be substituted if a deposition method or material capable of increasing the uniformity is selected.

The outer edges of the planarization layer 160 and the polarizer 150 are removed so that the outer bezel regions BZx1 to BZy2 of the upper substrate 110b are exposed, as shown in FIG. The planarization layer 160 and the outer surface of the polarizer 150 may be removed by a photolithography process or an etching process such as dry etching or wet etching.

<Fifth Embodiment>

11 to 14 are views for explaining a method of forming a planarization layer on a polarizing plate according to a fifth embodiment of the present invention. 11 to 14 are views for explaining a method of forming a polarizing plate and a planarizing layer on a mother substrate.

As shown in Fig. 11, a mother substrate MG is prepared. The mother substrate MG is made of a flat and transparent material such as glass. Virtual boundary lines LX and LY are defined so that a cell unit area serving as an upper substrate of the display panel is partitioned on the prepared mother substrate MG.

12, a polarizing plate 150 is formed on the first surface (the surface of the mother substrate MG when it is attached to the lower substrate) by using a laminating method. At this time, the polarizer 150 is formed corresponding to the size of the mother substrate MG.

As shown in FIG. 13, a selected one of an organic film or an organic / inorganic composite film is formed on the polarizing plate 150 using a slit coating method or a spin coating method. At this time, the selected material is formed corresponding to the size of the polarizer 150 or the mother substrate MG. Then, the selected material is irradiated with ultraviolet rays (UV) and cured to form the planarization layer 160. However, in the case of the planarization layer 160, an inorganic film may be substituted if a deposition method or material capable of increasing the uniformity is selected.

The outline of the planarization layer 160 and the polarizer 150 is removed so that the outer bezel regions BZx1 to BZy3 of the upper substrate 110b are exposed, as shown in FIG. The planarization layer 160 and the outer surface of the polarizer 150 may be removed by a photolithography process or an etching process such as dry etching or wet etching. Subsequently, the partitioned virtual boundary lines LX and LY are cut and a lower substrate 110b is obtained in units of cells.

Hereinafter, the display panel manufactured by the fourth and fifth embodiments will be described.

15 and 16 are exemplary views of a display panel manufactured by the fourth and fifth embodiments. Specifically, the display panel shown in Figs. 15 and 16 shows the structure of the organic light emitting display panel as an example. However, its structure should be interpreted as a liquid crystal display panel or a stereoscopic image display panel as described above.

In the present invention, the flattening layer 160 and the outer surface of the polarizing plate 150 are removed in consideration of the adhesion force, the cell gap, the thickness of the display panel, and the like when the upper substrate is attached to the lower substrate. In this case, the display panel PNL has a structure in which the display panel PNL is fixed by the adhesive member 200 formed on the outer surface of the lower substrate 110a and the upper substrate 110b, as shown in Fig.

However, according to the structure of the display panel (PNL), the process of removing the outline of the planarization layer 160 and the polarizer 150 can be omitted (or deleted). In this case, the display panel PNL has a structure in which the display panel PNL is bonded by the adhesive member 200 formed on the outer surface of the lower substrate 110a and the outer surface of the flattening layer 160 as shown in Fig. However, only the outline of the planarization layer 160 may be removed according to the process of manufacturing the display panel PNL.

As described above, the present invention improves or prevents problematic problems such as display unevenness (wavy patterns and the like) by increasing the surface uniformity and flatness of the polarizing plate when the polarizing plate is formed on the inner surface of the display panel, There is an effect of providing a display device having the above-described structure. In addition, the present invention has the additional effect of increasing both the surface uniformity and the flatness of the polarizing plate as well as the flatness of the alignment film.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, It will be understood that the invention may be practiced. It is therefore to be understood that the embodiments described above are to be considered in all respects only as illustrative and not restrictive. In addition, the scope of the present invention is indicated by the following claims rather than the detailed description. Also, all changes or modifications derived from the meaning and scope of the claims and their equivalents should be construed as being included within the scope of the present invention.

PNL: Display panel 110a: Lower substrate
110b: upper substrate SP: sub-pixels
150: polarizer 160: planarization layer
170a, 170b: Orientation film 140: Liquid crystal layer
180: patterned retarder film 190: black stripe

Claims (13)

A display panel including subpixels formed between the lower substrate and the upper substrate;
A polarizer formed on the inner surface of the upper substrate; And
And a planarizing layer formed on the polarizing plate to compensate for and flatten the non-uniform upper surface of the polarizing plate. The method according to claim 1,
The planarization layer
An organic film or an organic / inorganic composite film. The method according to claim 1,
The display panel
And an alignment layer formed on the planarization layer. The method according to claim 1,
The display panel
And a pattern relief film positioned between the polarizer and the upper substrate and having a first pattern area and a second pattern area separating an image formed by the sub pixels into a left eye and a right eye. 5. The method of claim 4,
The display panel
And a black stripe formed between the pattern relief film and the upper substrate and corresponding to a boundary portion between the first pattern region and the second pattern region. Forming subpixels on the lower substrate;
Forming a polarizer on the inner surface of the upper substrate;
Forming a planarizing layer on the polarizing plate to compensate for a non-uniform surface of the polarizing plate to flatten the polarizing plate; And
And assembling the lower substrate and the upper substrate to manufacture a display panel. The method according to claim 6,
The step of forming the planarization layer
Wherein a slit coating method or a spin coating method is used. The method according to claim 6,
The step of forming the polarizing plate and the planarizing layer
Forming a polarizing plate corresponding to a front surface of the upper substrate,
After the planarization layer is formed corresponding to the front surface of the polarizer,
And simultaneously removing the polarizing plate and the outer region of the planarizing layer to expose the bezel region of the upper substrate. The method according to claim 6,
The planarization layer
Wherein the cured product is cured by ultraviolet rays. The method according to claim 6,
The planarization layer
An organic film or an organic / inorganic composite film. The method according to claim 6,
The display panel
And an alignment film formed on the planarizing layer. The method according to claim 6,
The display panel
And a pattern relief film positioned between the polarizer and the upper substrate and having a first pattern area and a second pattern area separating an image formed by the sub pixels into a left eye and a right eye. 13. The method of claim 12,
And a black stripe formed between the pattern relief film and the upper substrate and corresponding to the first pattern region and the second pattern region.

Images