Display device

Abstract

A display device is provided. The display device includes: a display panel configured to display a 2D image; an optical member configured to display the 2D image displayed on the display panel through a display optical path holding the 2D image during a 2D image display period, and configured to display a 3D stereoscopic image through a display optical path refracting the 2D image during a 3D stereoscopic image display period; and a display driver configured to drive the display panel such that the display panel displays a multi-view image in a 2D image display period and a 3D stereoscopic image display period, and configured to apply a driving voltage to the optical member to control an operation of the optical member for displaying the 2D image or the 3D stereoscopic image.

Description

Technical Field

[0001] The present disclosure relates to a display device. Background Art

[0002] A three-dimensional (3D) image display device is a display device that can convey depth to the viewer, creating a sense of three dimensions. This can be achieved by presenting two slightly different images to each eye (e.g., a left eye image and a right eye image). The brain fuses the two images together to create a depth perception based on binocular parallax. Optical components can be used to provide the image in the space in front of the display device.

[0003] The 3D image display device may use stereoscopic technology or autostereoscopic technology. Stereoscopic technology uses parallax images between the left eye and the right eye to provide a large stereoscopic effect. Stereoscopic technology can be implemented with or without glasses.

[0004] In the stereoscopic technology using glasses, a left-eye image and a right-eye image having different polarizations are displayed so that a viewer using polarized glasses or shutter glasses can see a 3D image. In the non-glasses stereoscopic technology, optical members such as a parallax barrier and a lenticular lens sheet are formed in a display device, and the optical axis of the left-eye image is separated from the optical axis of the right-eye image so that the viewer can see a 3D image. Unfortunately, the non-glasses stereoscopic display device has the following disadvantages: when the driving characteristics of the birefringent material that refracts the image display light become degraded, adjacent parallax images overlap each other. Summary of the invention

[0005] Aspects of the present disclosure provide a display device that can improve driving characteristics of a birefringent material that refracts image display light during a stereoscopic image display period by optimizing the arrangement of a driving electrode of the birefringent material.

[0006] Aspects of the present disclosure also provide a display device that can prevent crosstalk by blocking images distorted at contact areas between optical lenses and side edges of the optical lenses.

[0007] According to a disclosed embodiment, a display device includes a display panel, an optical member, and a display driver, the display panel being configured to display a two-dimensional (2D) image. The optical member is configured to display a 2D image displayed on the display panel by maintaining a display light path of the 2D image during a 2D image display period, and is configured to display a 3D stereoscopic image by refracting a display light path of the 2D image during a 3D stereoscopic image display period. The display driver is configured to drive the display panel so that the display panel displays a multi-view image in a 2D image display period and a 3D stereoscopic image display period, and is configured to apply a driving voltage to the optical member to control the operation of the optical member for displaying a 2D image or a 3D stereoscopic image.

[0008] In an embodiment, the optical member includes: a first optical sheet and a second optical sheet facing each other; a polarization controller disposed between the first optical sheet and the second optical sheet and formed on a front surface of the first optical sheet; and a plurality of optical lenses formed on a rear surface of the second optical sheet between the first optical sheet and the second optical sheet to overlap with the polarization controller.

[0009] In an embodiment, a polarization controller comprises: at least one first transparent electrode disposed on a front surface of a first optical sheet; a polarization control layer disposed on the front surface of the first transparent electrode; and at least one second transparent electrode disposed to face the at least one first transparent electrode, wherein the polarization control layer is placed between the at least one first transparent electrode and the at least one second transparent electrode.

[0010] According to a disclosed embodiment, a display device includes a display panel, an optical member, and a display driver, the display panel being configured to display a 2D image. The optical member is configured to display a 2D image displayed on the display panel by maintaining a display light path of the 2D image during a 2D image display period, and is configured to display a 3D stereoscopic image by refracting the display light path of the 2D image during a 3D stereoscopic image display period. The display driver is configured to control the optical member, which is used to form an optical path in a first linear polarization direction or an optical path in a second linear polarization direction in a 2D image display period or a 3D stereoscopic image display period. The display driver drives the display panel so that the display panel displays a multi-view image in the 2D image display period and the 3D stereoscopic image display period, and applies a driving voltage to the optical member to control the operation of the optical member for displaying a 2D image or a 3D stereoscopic image.

[0011] According to a disclosed embodiment, a display device includes an optical member and a display driver. The optical member is configured to display a 2D image displayed on a display panel by maintaining a display light path of the 2D image during a 2D image display period, and is configured to display a 3D stereoscopic image by refracting the display light path of the 2D image during a 3D stereoscopic image display period. The optical member includes: a first optical sheet and a second optical sheet facing each other; a polarization controller disposed on a front surface of the first optical sheet between the first optical sheet and the second optical sheet; and a plurality of optical lenses disposed on a rear surface of the second optical sheet between the first optical sheet and the second optical sheet to overlap with the polarization controller.

[0012] According to at least one embodiment of the present disclosure, the definition and display quality of a stereoscopic image in a display device may be improved by improving the driving characteristics of a birefringent material that refracts image display light during a stereoscopic image display period.

[0013] According to at least one embodiment of the present disclosure, crosstalk in a display device may be suppressed and user satisfaction and reliability of the display device may be improved by blocking images distorted at contact areas between optical lenses and side edges of the optical lenses. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The above and other aspects and features of the present disclosure will become more apparent by describing embodiments of the present disclosure in detail with reference to the attached drawings.

[0015] Figure 1 is an exploded perspective view showing a display device according to an embodiment of the present disclosure.

[0016] Figure 2 It is shown Figure 1 A view of the display panel and optical members shown in FIG. 1 when they are attached together.

[0017] Figure 3 is a plan view showing a portion of the arrangement structure of sub-pixels in a display area.

[0018] Figure 4 is a plan view showing a portion of an arrangement structure of sub-pixels of a display area according to an embodiment.

[0019] Figure 5 is a diagram showing a method of setting viewpoint information for each sub-pixel according to the lens width of an optical member.

[0020] Figure 6 It is shown along Figure 5 2 is a cross-sectional view of a sub-pixel and an optical member according to an embodiment taken along line II′ shown in FIG.

[0021] Figure 7 It is shown along Figure 5 2 is a cross-sectional view of a sub-pixel and an optical member according to an embodiment taken along line II′ shown in FIG.

[0022] Figure 8 is a diagram showing a method according to an embodiment of the present invention. Figure 7 A cross-sectional view of the sub-pixels and optical components shown in FIG.

[0023] Fig. 9 It is shown along Figure 5 2 is a cross-sectional view of a sub-pixel and an optical member according to an embodiment taken along line II′ shown in FIG.

[0024] Fig.10 is a diagram showing a method according to an embodiment of the present invention. Fig. 9 A cross-sectional view of the sub-pixels and optical components shown in FIG.

[0025] Fig.11is a diagram showing image display timings during a 2D image display period and a 3D stereoscopic image display period.

[0026] Fig.12 is a graph showing changes in voltage levels applied to the first transparent electrode and the second transparent electrode during a 2D image display period and a 3D stereoscopic image display period.

[0027] Fig.13 is a cross-sectional view illustrating a light exit path of a polarization control layer and an optical lens of an optical member according to an embodiment during a 2D image display period.

[0028] Fig.14 is a diagram showing the display of a 3D stereoscopic image according to an embodiment of the present invention during a 3D stereoscopic image display period. Fig.13 A cross-sectional view of a light exit path of a polarization control layer and an optical lens of an optical member.

[0029] Fig.15 It is shown along Figure 5 2 is a cross-sectional view of a sub-pixel and an optical member according to an embodiment taken along line II′ shown in FIG.

[0030] Fig.16 It is shown along Figure 5 2 is a cross-sectional view of a sub-pixel and an optical member according to an embodiment taken along line II′ shown in FIG.

[0031] Fig.17 It is shown along Figure 5 2 is a cross-sectional view of a sub-pixel and an optical member according to an embodiment taken along line II′ shown in FIG.

[0032] Fig.18 is a cross-sectional view illustrating a light exit path of a polarization control layer and an optical lens of an optical member according to an embodiment during a 2D image display period.

[0033] Fig.19 is a cross-sectional view illustrating light exit paths of a polarization control layer and an optical lens of an optical member according to an embodiment during a 3D stereoscopic image display period.

[0034] Fig. 20 is an exploded perspective view showing a display device according to an embodiment of the present disclosure.

[0035] Fig.21 It is shown Fig. 20 A plan view of the display panel and optical components shown in FIG. DETAILED DESCRIPTION

[0036] The present disclosure will now be described more fully hereinafter with reference to the accompanying drawings, in which example embodiments of the present disclosure are shown. However, the present disclosure may be implemented in different forms and should not be construed as being limited to the embodiments set forth herein. On the contrary, these embodiments are provided so that the present disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

[0037] It will also be understood that when a layer is referred to as being “on” another layer or substrate, it can be directly on the other layer or substrate, or intervening layers may also be present. Throughout the specification, the same reference numerals refer to the same components.

[0038] Each of the features of the various embodiments of the present disclosure can be combined or combined with each other in part or in whole, and various interlocks and drives are technically possible. Each embodiment can be implemented independently of each other, or can be implemented together in association.

[0039] Hereinafter, embodiments of the present disclosure will be described with reference to the accompanying drawings.

[0040] Figure 1 is an exploded perspective view showing a display device according to an embodiment of the present disclosure. Figure 2 It is shown Figure 1 A view of the display panel and optical members shown in FIG. 1 when they are attached together.

[0041] The display device 290 may be implemented as a flat panel display device such as a liquid crystal display (LCD) device, a field emission display (FED) device, a plasma display panel (PDP) device, or an organic light emitting display (OLED) device.

[0042] The display device 290 may be a stereoscopic image display device (e.g., a 3D image display device) including the display module 100 and the optical member 200. In an embodiment, the 3D image display device displays a left-eye image and a right-eye image on its front side, respectively, so that the viewer can perceive the 3D image using binocular parallax. The 3D image display device may separately provide images at different viewing angles on its front side, so that different images are displayed at different viewing angles.

[0043] According to an embodiment of the present disclosure, the display device 290 is a light field display device that enables each viewer's eye to see different image information by arranging the optical member 200 on the front side of the display module 100. The light field display device can generate a light field by displaying a 2D image using the display module 100 and converting the 2D image into a 3D image for display using the optical member 200 to generate a 3D stereoscopic image. In an embodiment, the light field display device enables the image display light generated in each pixel in the display module 100 to form a light field pointing to a specific direction (specific viewing angle and / or specific viewpoint) through a stereoscopic lens, a pinhole, or a barrier included in the optical member 200. In this way, 3D stereoscopic image information related to a specific direction can be provided to the viewer.

[0044] The display module 100 may include a display panel 110 , a display driver 120 (eg, a driver circuit), and a circuit board.

[0045] The display panel 110 may include a display area DA and a non-display area NDA. The display area DA may include a data line, a scan line, a power supply voltage line, and a plurality of pixels connected to the data line and the scan line. For example, the scan line may extend in a first direction (X-axis direction) and may be spaced apart from each other in a second direction (Y-axis direction). The data line and the power supply voltage line may extend in the second direction (Y-axis direction) and may be spaced apart from each other in the first direction (X-axis direction).

[0046] Each pixel (or unit pixel) formed and arranged on the display panel 110 includes a minimum number of sub-pixels capable of emitting white light. For example, each pixel may include three sub-pixels that emit red light, green light, and blue light, respectively. Each pixel arranged sequentially and repeatedly may be connected to at least one scan line, a data line, and a power supply voltage line. Each of the sub-pixels may include a thin film transistor, a light emitting element, and a capacitor, and the thin film transistor includes a drive transistor and at least one switch transistor. When a scan signal is applied from the scan line, each of the pixels receives a data voltage from the data line, and a drive current is supplied to the light emitting element according to the data voltage applied to the gate electrode, so that light can be emitted.

[0047] Here, the pixels (e.g., unit pixels) of the display panel 110 display a 2D multi-view image according to the order in which the display driver 120 provides image data. The multi-view image includes n view images, where n is a natural number equal to or greater than 2. Such n view images may be generated by capturing images of an object using n cameras spaced apart from each other by a distance between human eyes.

[0048] The display panel 110 can display a multi-view image in units of n pixels during an image display period. For example, the display panel 110 can display a multi-view image in units of two pixels. In other words, two pixels of the display panel 110 can display a multi-view image including two view images. In particular, the display panel 110 can display a multi-view image in units of time-division frames (or subframes) according to the time-division drive of the display driver 120. For each time-division frame, a multi-view image can be displayed in units of two pixels. In an embodiment, a time-division frame is a period in which a frame is divided into 1 / 2 or 1 / 3 subframes.

[0049] The non-display area NDA may be disposed at an edge of the display panel 110 to surround the display area DA. The non-display area NDA may include a scan driver (not shown) that applies a scan signal to a scan line and a pad (also referred to as a "pad") (not shown) connected to the display driver 120. For example, the display driver 120 may be disposed on one side of the non-display area NDA, and the pad may be disposed on one edge of the non-display area NDA on which the display driver 120 is disposed.

[0050] The display driver 120 may output a control signal and an image data voltage for driving the display panel 110 in units of at least one frame or at least one time-division frame (or subframe). For example, the display driver 120 may supply an image data voltage to a data line in units of at least one time-division frame (or subframe). The display driver 120 supplies a power supply voltage to a power supply voltage line, and may supply a scan control signal to a scan driver.

[0051] The optical member 200 includes a plurality of optical lenses (eg, refractive index anisotropic lenses) 230 formed between a first optical sheet 210 and a second optical sheet 220 , and a polarization controller stacked on and overlapped with the plurality of optical lenses 230 .

[0052] In an embodiment, the display driver 120 selects a viewpoint and the number of viewpoints according to the viewpoint of each sub-pixel according to the relative position between the plurality of optical lenses 230 arranged in parallel between the first optical sheet 210 and the second optical sheet 220 of the optical member 200 and the sub-pixel. In an embodiment, the display driver 120 aligns the position of the image data for each horizontal line input from an external source based on the viewpoint and the number of viewpoints of the sub-pixel. The display driver 120 may generate image data voltages corresponding to the image data whose arrangement positions are aligned for each horizontal line to supply them to the data lines, so that a 3D stereoscopic image is displayed according to the relative arrangement positions of the sub-pixels relative to the optical lens 230 in addition to the polarization controller.

[0053] The display driver 120 may be implemented as an integrated circuit (IC) and may be disposed in the non-display area NDA of the display panel 110 by a chip on glass (COG) technology, a chip on plastic (COP) technology, or ultrasonic bonding. In another example, the display driver 120 may be mounted on a circuit board (not shown) and connected to a pad of the display panel 110.

[0054] The optical member 200 may be disposed at the front side of the display panel 110 or the display module 100. The optical member 200 may be attached to the surface of the display panel 110 or the display area DA by an adhesive member. The optical member 200 may be attached to the front surface of the display module 100 by a panel bonding device.

[0055] The optical member 200 may include a polarization controller and a plurality of optical lenses 230 formed between the first optical sheet 210 and the second optical sheet 220 so that they overlap and are stacked on each other. The plurality of optical lenses 230 may be arranged in parallel in the form of a lens sheet. In addition, the polarization controller may be arranged so that it overlaps with the plurality of optical lenses 230.

[0056] In an embodiment, a polarizing plate is formed on the rear surface of the first optical sheet 210 or the front surface of the display panel 110, and the polarizing plate filters the 2D image display light of the display panel 110 to be output through a path in a first linear polarization direction. The polarization controller of the optical member 200 may transmit the 2D image display light incident along the path in the first linear polarization direction through the first optical sheet 210 without changing the path, or may change the path of the light to a path in a second linear polarization direction to transmit it.

[0057] In an embodiment, the polarization controller transmits the 2D image display light incident via a path in the first linear polarization direction through the first optical sheet 210 without changing the path during the 2D image display period in response to driving control of the display driver 120. In an embodiment, the polarization controller transmits the 2D image display light incident via a path in the first linear polarization direction by changing the path to a path in the second linear polarization direction in response to driving control of the display driver 120.

[0058] The plurality of optical lenses 230 in the form of a lens sheet may be constructed and arranged to form a path in a first linear polarization direction according to the arrangement (arrangement) of the material of the lens or the birefringent material (e.g., liquid crystal or slit) included therein. Therefore, the plurality of optical lenses 230 may transmit the 2D image display light incident along the path in the first linear polarization direction through the polarization controller during the 2D image display period while maintaining the path in the first linear polarization direction. However, when the 2D image display light is incident on the plurality of optical lenses 230 along the path in the second linear polarization direction through the polarization controller during the 3D image display period, the 2D image display light is refracted toward a predetermined viewpoint by the arrangement of the material of the lens or the birefringent material, and is displayed as a 3D image. That is, the optical lens 230 transmits the 2D image display light incident along the path in the first linear polarization direction while maintaining the path in the first linear polarization direction, and transmits the 2D image display light incident along the path in the second linear polarization direction by refracting the light toward the predetermined viewpoint. Therefore, a 3D stereoscopic image is displayed by the plurality of optical lenses 230 during the 3D image display period.

[0059] Figure 3 is a plan view showing a portion of the arrangement structure of sub-pixels in a display area.

[0060] Figure 3 The arrangement structure of sub-pixels arranged in 6 rows and 24 columns is shown. Figure 3 The arrangement structure includes a sub-pixel positioned in the first row and the first column to a sub-pixel positioned in the sixth row and the twenty-fourth column.

[0061] Reference Figure 3 , a plurality of pixels (e.g., a plurality of unit pixels UP) are provided and arranged in the display area DA of the display panel 110. Each of the unit pixels UP includes a plurality of sub-pixels SP1, SP2, and SP3. The sub-pixels SP1, SP2, and SP3 may be arranged along a plurality of rows and a plurality of columns. For example, the sub-pixels SP1, SP2, and SP3 may be arranged in a vertical stripe or horizontal stripe structure. As the resolution of the display device 290 increases, the display area DA may include more unit pixels UP.

[0062] In an embodiment, each of the unit pixels UP includes first to third sub-pixels SP1, SP2, and SP3 that display different colors. The first to third sub-pixels SP1, SP2, and SP3 may be formed at positions where n data lines and m scan lines intersect each other, where n and m are natural numbers greater than 0. Each of the plurality of sub-pixels SP1, SP2, and SP3 may include a light-emitting element and a pixel circuit. The pixel circuit may include a driving transistor, at least one switching transistor, and at least one capacitor to drive the light-emitting element of each of the plurality of sub-pixels SP1, SP2, and SP3.

[0063] In an embodiment, each of the plurality of unit pixels UP may include a first sub-pixel SP1, a second sub-pixel SP2, and a third sub-pixel SP3. In an embodiment, each of the plurality of unit pixels UP may include four sub-pixels (i.e., a first sub-pixel SP1, two second sub-pixels SP2, and a third sub-pixel SP3). The number of sub-pixels included in each unit pixel UP is not limited thereto. The first sub-pixel SP1 may be a red sub-pixel, the second sub-pixel SP2 may be a green sub-pixel, and the third sub-pixel SP3 may be a blue sub-pixel. Each of the first to third sub-pixels SP1, SP2, and SP3 may receive a data signal containing brightness information of red light, green light, or blue light from the display driver 120, and may output light of a corresponding color.

[0064] Figure 4 is a plan view showing a portion of an arrangement structure of sub-pixels of a display area according to an embodiment.

[0065] Reference Figure 4 , a plurality of unit pixels UP and a plurality of sub-pixels SP1, SP2 and SP3 may be arranged as Specifically, each of the plurality of unit pixels UP may include a plurality of pixels arranged as follows: The first to third subpixels SP1, SP2, and SP3 of the matrix. The first to third subpixels SP1, SP2, and SP3 may be formed at positions where n data lines and m scan lines cross each other, where n and m are natural numbers greater than 0, and n and m may be different from or equal to each other.

[0066] Each of the plurality of unit pixels UP may include a first sub-pixel SP1, two second sub-pixels SP2 and a third sub-pixel SP3, but is not limited thereto. The first sub-pixel SP1 may be a red sub-pixel, the second sub-pixel SP2 may be a green sub-pixel, and the third sub-pixel SP3 may be a blue sub-pixel. In an embodiment, each of the first to third sub-pixels SP1, SP2 and SP3 includes an opening. The size of the opening of each of the first to third sub-pixels SP1, SP2 and SP3 may be determined according to the brightness of the light. Therefore, the size of the opening of each of the first to third sub-pixels SP1, SP2 and SP3 may be adjusted to express white light by mixing the light emitted from a plurality of emission layers. Each of the first to third sub-pixels SP1, SP2 and SP3 may receive a data signal containing brightness information of red light, green light or blue light from the display driver 120, and may output light of the corresponding color. The unit pixel UP may have coordinates ranging from (x0, y0) to (xn, yn).

[0067] Figure 5 is a diagram showing a method of setting viewpoint information for each sub-pixel according to the lens width of an optical member.

[0068] Reference Figure 5 In an embodiment, the viewpoint information and the number of viewpoints of each sub-pixel are set by the width and the tilt angle of each of the optical lenses LS1, LS2, and LS3 arranged in parallel between the first optical sheet 210 and the second optical sheet 220. In an embodiment, the relative positions of the sub-pixels SP1, SP2, and SP3 overlapped with the optical lenses LS1, LS2, and LS3 are set in a certain order according to the width and the tilt angle of each of the optical lenses LS1, LS2, and LS3.

[0069] For example, the viewpoint information and the viewpoint number according to the relative positions of the sub-pixels SP1, SP2, and SP3 respectively overlapped with the optical lenses LS1, LS2, and LS3 may be repeatedly specified in the width direction of the optical lenses LS1, LS2, and LS3 or in the X-axis direction. The viewpoint information VPI or the viewpoint number may be expressed as the following equation 1:

[0070] VPI = rownum × pixelsize × tan(tilt angle) [Equation 1],

[0071] Wherein, rownum represents the number of lenses in the horizontal line direction, and pixelsize represents the width or size of each sub-pixel. In addition, tan(tilt angle) represents the tilt angle tanθ. According to this embodiment, the lenses are arranged in parallel in the Y-axis direction (or vertical direction), so tan(tilt angle) is equal to 1.

[0072] The viewpoint information (or the number of viewpoints) of the sub-pixels arranged in the first horizontal line and the viewpoint information from the second horizontal line to the last horizontal line are the same in the Y-axis direction (or the vertical direction).

[0073] In an embodiment, viewpoint information of each of the sub-pixels SP1, SP2 and SP3 is specified based on the relative positions of the sub-pixels SP1, SP2 and SP3 of each of the optical lenses LS1, LS2 and LS3, and the image display point or viewpoint of the display device 290 is specified based on the viewpoint information and the number of each of the sub-pixels SP1, SP2 and SP3.

[0074] like Figure 5 As shown in , the image display point or viewpoint of the display device 290 can be consistent with the width of each of the optical lenses LS1, LS2 and LS3 or located within the width of each of the optical lenses LS1, LS2 and LS3, and can be set in the same manner as the number of sub-pixels SP1, SP2 and SP3 and the number of viewpoints set on the rear surface of each of the optical lenses LS1, LS2 and LS3. In an embodiment, the viewpoint is consistent with the width of the rear surface (or substrate surface or substrate side) of each of the optical lenses LS1, LS2 and LS3 or located within the width. If the number of sub-pixels SP1, SP2 and SP3 set on the rear surface of each of the optical lenses LS1, LS2 and LS3 is nine, then there can be nine different viewpoints for detecting the optical characteristics of the display device 290.

[0075] Figure 6 It is shown along Figure 5 2 is a cross-sectional view of a sub-pixel and an optical member according to an embodiment taken along line II′ shown in FIG.

[0076] Reference Figure 5 and Figure 6 , the display device 290 includes a display panel 110 that displays a 2D image and an optical member 200 that displays the 2D image as a 2D image or converts the 2D image into a 3D stereoscopic image to display the 3D stereoscopic image.

[0077] The first to third sub-pixels SP1, SP2, and SP3 sequentially arranged in the display area DA of the display panel 110 display a 2D multi-view image. For example, during the 2D image display period and the 3D stereoscopic image display period, the first to third sub-pixels SP1, SP2, and SP3 may display a 2D multi-view image in units of at least two adjacent sub-pixels or unit pixels UP. In an embodiment, at least two adjacent sub-pixels or unit pixels UP display a multi-view image including two view images. In an embodiment, the first to third sub-pixels SP1, SP2, and SP3 of the display panel 110 emit 2D image display light in a first linear polarization direction to the front side according to the orientation of the polarizer or polarizing plate 201 on the front side.

[0078] In an embodiment, the polarizer 201 may be attached and formed on the front surface of the display panel 110. In an embodiment, the polarizer 201 is attached to the rear surface of the optical member 200 facing the front surface of the display panel 110, or is included in the inner surface of the optical member 200. The polarizer 201 converts the 2D image display light of the display panel 110 into light in a path (e.g., a display light path) in a predetermined first linear polarization direction or a second linear polarization direction, so that the converted light is transmitted through. According to an embodiment of the present disclosure, the polarizer 201 converts the 2D image display light of the display panel 110 into light in a path in the first linear polarization direction, so that the converted light is transmitted through.

[0079] The optical member 200 displays a 2D image while maintaining a display light path of the 2D image displayed in the display area DA of the display panel 110 during the 2D image display period, and displays a 3D stereoscopic image by refracting the display light path of the 2D image during the 3D stereoscopic image display period.

[0080] In an embodiment, during a 2D image display period, the optical member 200 outputs display light of a 2D image displayed in the display area DA of the display panel 110 along an optical path in a first linear polarization direction without changing a path under the control of the display driver 120. In an embodiment, during a 3D stereoscopic image display period, the optical member 200 converts display light of a 2D image displayed in the display area DA into light in an optical path in a second linear polarization direction and refracts it under the control of the display driver 120 to output the light and display a 3D stereoscopic image.

[0081] In an embodiment, the display driver 120 divides each frame for displaying an image into a first time division frame and a second time division frame, and during a period in which a 2D image is displayed, applies a first driving voltage to the optical member 200 every first time division frame and second time division frame. When the unit pixels UP of the display area DA are driven in this manner, a 2D image is displayed in the display area DA.

[0082] During the 2D image display period, the optical member 200 outputs display light of the 2D image displayed in the display area DA along the optical path in the first linear polarization direction without changing the path in response to the first driving voltage input from the display driver 120. As a result, during the 2D image display period, a 2D image is displayed through the display panel 110 and the optical member 200.

[0083] In an embodiment, during a 3D stereoscopic image display period, the display driver 120 divides each frame for displaying a 3D stereoscopic image into a first time-division frame and a second time-division frame, and applies a first driving voltage and a second driving voltage to the optical member 200 every first time-division frame and the second time-division frame. In an embodiment, the first driving voltage is different from the second driving voltage, and there is a predetermined voltage difference between the first driving voltage and the second driving voltage. For example, the first driving voltage and the second driving voltage may be voltages of different levels having a predetermined voltage difference of 15V or more (e.g., a voltage difference of 15V or 25V). In an embodiment, during a 3D stereoscopic image display period, the display driver 120 displays a multi-view image including two 2D view images by driving each unit pixel UP every first time-division frame and the second time-division frame.

[0084] In an embodiment, during the 3D stereoscopic image display period, the optical member 200 converts display light of a 2D image displayed in the display area DA into light in an optical path in a second linear polarization direction and refracts them in response to the first driving voltage and the second driving voltage input from the display driver 120 to output the light and display a 3D stereoscopic image. Therefore, during the 3D stereoscopic image display period, the 2D image is refracted by the optical member 200 and displayed as a 3D stereoscopic image.

[0085] like Figure 6 As shown in , the optical member 200 includes a polarization controller 240 and a plurality of optical lenses (eg, refractive index anisotropic lenses) 230 that are overlapped and stacked on each other and between a first optical sheet 210 and a second optical sheet 220 .

[0086] In an embodiment, the polarization controller 240 is disposed between the first optical sheet 210 and the second optical sheet 220 and on the front surface of the first optical sheet 210. In an embodiment, the optical lenses 230 are formed between the first optical sheet 210 and the second optical sheet 220 and on the rear surface of the second optical sheet 220 such that they overlap with and are stacked on the polarization controller 240.

[0087] In an embodiment, the first optical sheet 210 is disposed in the shape of a flat plate on the entire surface of the display area DA. One surface of the first optical sheet 210 and the opposite surface of the first optical sheet 210 may be parallel to each other. The first optical sheet 210 may transmit light incident from the display area DA so that the light is emitted as it is. In other words, the linear polarization direction of the 2D image display light passing through the rear surface of the first optical sheet 210 is maintained in the same linear polarization direction as the linear polarization direction having when passing through the front surface of the first optical sheet 210.

[0088] The polarization controller 240 is formed on the front surface of the first optical sheet 210. When the first driving voltage is input from the display driver 120, the polarization controller 240 transmits the display light of the 2D image displayed in the display area DA to the front side via the optical path in the first linear polarization direction without changing it. In addition, when the first driving voltage and the second driving voltage are input from the display driver 120, the display light of the 2D image displayed in the display area DA is converted into light in the optical path in the second linear polarization direction and is output. For example, the first linear polarization direction may refer to a direction in which light travels while oscillating in the Z-axis direction, and the second linear polarization direction may refer to a direction in which light travels while oscillating in the X-axis direction.

[0089] In an embodiment, the polarization controller 240 includes at least one first transparent electrode 241 formed on the front surface of the first optical sheet 210, a polarization control layer 243 formed on the front surface of the first transparent electrode 241, and at least one second transparent electrode 242 disposed to face the at least one first transparent electrode 241 with the polarization control layer 243 therebetween.

[0090] When viewed from the top, at least one first transparent electrode 241 may be formed in a polygonal shape (such as a triangle, a quadrilateral, and a pentagon), or may be formed in at least one flat plate shape or a plurality of strip shapes. Under the control of the display driver 120, the first driving voltage or the second driving voltage is supplied to the at least one first transparent electrode 241 by the display driver 120 or a separate voltage source. For example, a first driving voltage of 0V or 1V may be applied to the at least one first transparent electrode 241 by the display driver 120 or a separate voltage source.

[0091] In an embodiment, at least one second transparent electrode 242 is disposed to face at least one first transparent electrode 241 in parallel with the polarization control layer 243 therebetween. At least one second transparent electrode 242 may be formed in a flat plate shape or a plurality of strip shapes so that it faces at least one first transparent electrode 241 in parallel.

[0092] In addition, at least one second transparent electrode 242 may be formed on the surface of the plurality of optical lenses 230 so that it parallelly faces at least one first transparent electrode 241. For example, at least one second transparent electrode 242 may cover the surface of the plurality of optical lenses 230 so that it parallelly faces at least one first transparent electrode 241. Since at least one second transparent electrode 242 is formed to cover the plurality of optical lenses 230 on the rear side or the front side, the minimum distance D1 between at least one first transparent electrode 241 and at least one second transparent electrode 242 may be smaller than the width, height, or thickness of each optical lens 230.

[0093] The minimum distance D1 between at least one first transparent electrode 241 and at least one second transparent electrode 242 may be predetermined based on the width, height, or thickness of each optical lens 230. For example, the minimum distance D1 between at least one first transparent electrode 241 and at least one second transparent electrode 242 may be determined such that the minimum distance D1 is smaller than the width, height, or thickness of each optical lens 230.

[0094] In an embodiment, a polarization control layer 243 is formed between at least one first transparent electrode 241 and at least one second transparent electrode 242. The polarization control layer 243 includes at least one type of birefringent material. For example, the polarization control layer 243 may include a plurality of liquid crystals (or liquid crystal layers) having refractive index anisotropy. If the voltage levels of the first transparent electrode 241 and the second transparent electrode 242 are equal to each other or the voltage difference between the first transparent electrode 241 and the second transparent electrode 242 is smaller than a predetermined voltage difference, the birefringent material included in the polarization control layer 243 forms an optical path in the first linear polarization direction. On the other hand, if the voltage difference between the first transparent electrode 241 and the second transparent electrode 242 becomes larger than the predetermined voltage difference, an optical path in the second linear polarization direction is formed.

[0095] When the minimum distance D1 between the first transparent electrode 241 and the second transparent electrode 242 is narrow, the polarization control layer 243 may include a birefringent material with low viscosity (viscosity), and a birefringent material with high refractive index anisotropy may be used. For example, according to an embodiment of the present disclosure, if the minimum distance D1 between the first transparent electrode 241 and the second transparent electrode 242 is smaller than the height or thickness of each optical lens 230, a birefringent material with a viscosity less than 395 millipascal-seconds (mpa·s) (e.g., about 135 mpa·s) may be used. In an embodiment, a birefringent material with a refractive index anisotropy greater than 0.4Δε (e.g., 10Δε or greater) is used.

[0096] The polarization control layer 243 maintains or converts the linear polarization direction of the 2D image display light by using a birefringent material having a birefringence index that changes according to the voltage difference between the first transparent electrode 241 and the second transparent electrode 242. For example, if the voltage levels of the first transparent electrode 241 and the second transparent electrode 242 are equal to each other or the voltage difference between the first transparent electrode 241 and the second transparent electrode 242 is maintained below a predetermined voltage difference, the polarization control layer 243 can transmit the 2D image display light incident along the optical path in the first linear polarization direction from the rear side to the front side without changing the optical path. In an embodiment, the display driver 120 applies the same (or similar) first driving voltage to the first transparent electrode 241 and the second transparent electrode 242 during the 2D image display period to maintain the polarization direction of the polarization control layer 243.

[0097] However, if the voltage difference between the first transparent electrode 241 and the second transparent electrode 242 exceeds a predetermined voltage difference, the polarization control layer 243 directs the 2D image display light incident from the rear side in the first linear polarization direction. The optical path is converted into a second linear polarization direction As described above, the first linear polarization direction may refer to the direction in which light travels while oscillating in the Z-axis direction, and the second linear polarization direction may refer to the direction in which light travels while oscillating in the X-axis direction.

[0098] In an embodiment, the display driver 120 applies a first driving voltage to the first transparent electrode 241 and a second driving voltage to the second transparent electrode 242 every first time division frame and second time division frame during the 3D stereoscopic image display period to change the polarization direction of the polarization control layer 243. As described above, the first driving voltage and the second driving voltage are voltages of different levels having a predetermined voltage difference.

[0099] A plurality of optical lenses 230 are formed on the rear side of the second optical sheet 220 disposed in parallel to the first optical sheet 210 so that they overlap with and are stacked on the polarization controller 240. The plurality of optical lenses 230 may have a hemispherical cross section and may be formed in a circular or strip shape when viewed from the top. In an embodiment, the optical lens 230 has a flat rear surface attached to the rear surface of the second optical sheet 220 and a convex hemispherical surface facing the polarization controller 240. The plurality of optical lenses 230 may form a light propagation path in a first linear polarization direction according to the orientation of the birefringent material of the optical lens 230 itself or the orientation of the birefringent material (such as liquid crystal and slit) included inside the optical lens 230. For example, the plurality of optical lenses 230 may be formed by aligning the tilt direction of the longer axis of the liquid crystal in the first linear polarization direction or the arrangement and tilt direction of the slits and then curing them. In an embodiment, each of the optical lenses 230 has a semi-cylindrical shape.

[0100] In an embodiment, the plurality of optical lenses 230 are inclined lenses or semi-cylindrical lenses inclined at a predetermined angle from the side of each of the plurality of sub-pixels SP1, SP2, and SP3 in the display area DA. The predetermined angle may be designed to prevent the colored lines of the display device 290 from being perceived by the viewer. In another example, the plurality of optical lenses 230 are Fresnel lenses. However, the shape or type of each of the optical lenses 230 is not limited thereto.

[0101] When the 2D image display light is incident on the convex spherical surface of the optical lens 230 along the path in the first linear polarization direction, the 2D image display light in the first linear polarization direction passes through the optical lens 230 in the first linear polarization direction according to the refractive index in the shorter axis direction of the optical lens 230. In other words, during the 2D image display period, the polarization controller 240 transmits the display light of the 2D image displayed in the display area DA to the front side along the optical path in the first linear polarization direction without changing the path, so that the optical lens 230 also transmits the display light of the 2D image in the optical path in the first linear polarization direction to the front side.

[0102] In an embodiment, when the 2D image display light is incident on the plurality of optical lenses 230 along the optical path in the second linear polarization direction, the 2D image display light is refracted toward the viewpoint by the refractive index of the optical lens 230 forming the first linear polarization direction. That is, during the 3D stereoscopic image display period, the polarization controller 240 converts the display light of the 2D image displayed in the display area DA into the light in the optical path in the second linear polarization direction, and transmits the converted light. Therefore, the 2D image display light incident on the plurality of optical lenses 230 during the 3D stereoscopic image display period is refracted toward the corresponding viewpoint by the refractive index of the optical lens 230, and is displayed as a 3D stereoscopic image.

[0103] Figure 7 It is shown along Figure 5 2 is a cross-sectional view of a sub-pixel and an optical member according to an embodiment taken along line II′ shown in FIG. Figure 8 is a diagram showing a method according to an embodiment of the present invention. Figure 7 A cross-sectional view of the sub-pixels and optical components shown in FIG.

[0104] First, if Figure 7 As shown in , the optical member 200 may further include a plurality of light blocking patterns 221 formed at the rear side of the second optical sheet 220 and in line with (eg, overlapping) contact surfaces between adjacent optical lenses 230 and side edges of the optical lenses 230 .

[0105] The optical lens 230 is disposed at the rear side of the second optical sheet 220 on which the plurality of light blocking patterns 221 are formed.

[0106] The spherical aberration of each optical lens 230 may cause the light exit angle to be inconsistent at the contact area between the adjacent optical lenses 230 and the side edge of the optical lens 230. Therefore, the image may be distorted at the contact area between the optical lenses 230 and the side edge of the optical lens 230. In an embodiment, a plurality of light blocking patterns 221 are formed on the rear side of the second optical sheet 220 to block the distorted image display light on the rear side of the optical lens 230 where the second optical sheet 220 is disposed. In an embodiment, the light blocking pattern 221 overlaps the contact area between two adjacent optical lenses 230 and overlaps a small portion of the two adjacent optical lenses 230. In an embodiment, the light blocking pattern 221 contacts the optical lens 230.

[0107] Reference Figure 8The optical member 200 may further include a planarization layer 222 that provides a flat surface throughout all of the plurality of light blocking patterns 221 formed on the rear side of the second optical sheet 220. The planarization layer 222 may be formed as a transparent inorganic layer. The optical lens 230 may be disposed on the flat surface provided by the planarization layer 222 on the rear side of the second optical sheet 220. In an embodiment, the planarization layer 222 covers the light blocking patterns 221.

[0108] An image distorted at a contact region between the optical lenses 230 and at a side edge of the optical lens 230 may be blocked by a plurality of light blocking patterns 221 formed at a rear side of the second optical sheet 220 .

[0109] Fig. 9 It is shown along Figure 5 2 is a cross-sectional view of a sub-pixel and an optical member according to an embodiment taken along line II′ shown in FIG. Fig.10 is a diagram showing a method according to an embodiment of the present invention. Fig. 9 A cross-sectional view of the sub-pixels and optical components shown in FIG.

[0110] Reference Fig. 9 , a plurality of light blocking patterns 221 may be formed on the front side of the first optical sheet 210 in line with the contact surfaces between adjacent optical lenses 230 and the side edges of the optical lenses 230. In an embodiment, the light blocking patterns 221 are made of the same light blocking material as the black matrix formed on the display panel 110, or may be formed as a light blocking film.

[0111] Reference Fig.10 , the optical member 200 may further include a passivation layer PSV covering the light blocking pattern 221 formed at the front side of the first optical sheet 210 to protect the light blocking pattern 221. The passivation layer PSV may be formed as a transparent inorganic layer.

[0112] The first transparent electrode 241 of the polarization controller 240 may be formed on the front side of the first optical sheet 210 including the plurality of light blocking patterns 221 and the passivation layer.

[0113] The spherical aberration of each optical lens 230 may cause the light exit angle to be inconsistent at the contact area between adjacent optical lenses 230 and the side edge of the optical lens 230. Therefore, a plurality of light blocking patterns 221 may be formed on the side where the first optical sheet 210 is disposed so that the image display light is not incident at the contact area between the optical lenses 230 and the side edge of the optical lens 230.

[0114] Fig.11 is a diagram showing image display timings during a 2D image display period and a 3D stereoscopic image display period. Fig.12is a graph showing changes in voltage levels applied to the first transparent electrode and the second transparent electrode during a 2D image display period and a 3D stereoscopic image display period.

[0115] Reference Fig.11 , the display driver 120 may divide each frame (e.g., the first frame period 1Frame) into a first subframe SF1 and a second subframe SF2 during a 2D image display period (2D mode period), and may supply a 2D image data voltage RGB2D for displaying a 2D image to a data line of the display panel 110 in the first subframe SF1 and the second subframe SF2. Therefore, the display panel 110 may be driven at a frequency twice the input frame frequency. The frame frequency is 60 Hz for the National Television Standards Committee (NTSC) and 50 Hz for the Phase Alternation Line (PAL) specification. For example, the frame frequency of the display panel 110 may be 120 Hz, which is twice the frame frequency of the input image for NTSC.

[0116] Reference Fig.12 , the display driver 120 may supply the same first driving voltage to the first transparent electrode 241 and the second transparent electrode 242 during the 2D image display period. For example, the display driver 120 may generate the first driving voltage so that the first driving voltage is maintained below a predetermined level of 0V or 5V to apply it to the first transparent electrode 241 and the second transparent electrode 242.

[0117] Reference Fig.11 During a 3D stereoscopic image display period (3D mode period) in which a stereoscopic image such as a multi-view image is displayed, the display driver 120 may divide each frame (e.g., a first frame period 1Frame) into a first subframe SF1 and a second subframe SF2, and may apply 3D image data voltages MLD and MRD for displaying a 3D stereoscopic image to the data lines of the display panel 110 in the first subframe SF1 and the second subframe SF2.

[0118] Reference Fig.12 In an embodiment, during a 3D stereoscopic image display period, the display driver 120 supplies a first driving voltage to the first transparent electrode 241, and supplies a second driving voltage to the second transparent electrode 242, the second driving voltage being greater than the first driving voltage by a predetermined voltage difference or more. In other words, the display driver 120 may generate the first driving voltage and the second driving voltage to supply them to the first transparent electrode 241 and the second transparent electrode 242, respectively, so that the voltage difference between the first driving voltage of the first transparent electrode 241 and the second driving voltage of the second transparent electrode 242 is maintained at a predetermined voltage difference (e.g., 15V) or more.

[0119] Fig.13is a cross-sectional view illustrating light exit paths of an optical lens and a polarization controller of an optical member according to an embodiment during a 2D image display period.

[0120] Reference Fig.13 During the 2D image display period, the display driver 120 supplies the 2D image data voltage RGB2D for displaying a 2D image for each first frame period 1Frame or the first and second subframes SF1 and SF2 to the data lines of the display panel 110 .

[0121] All of the first to third sub-pixels SP1, SP2, and SP3 disposed in the display area DA of the display panel 110 may be polarized in the first linear polarization direction according to the orientation of the polarizing plate 201 disposed on the front surface. The 2D image on shows that light is emitted to the front side.

[0122] During the 2D image display period, the display driver 120 may generate the first driving voltage so that the first driving voltage is maintained below a predetermined level of 0V or 5V to apply them to the first transparent electrode 241 and the second transparent electrode 242. Therefore, the polarization control layer 243 allows the light from the rear side to pass through the first linear polarization direction without changing the light path. The 2D image incident on the light path shows that light is transmitted to the front side.

[0123] The light having passed through the polarization control layer 243 is in the first linear polarization direction. The 2D image display light on the optical lens 230 is incident on the convex spherical surface. Therefore, when the 2D image display light is incident on the convex spherical surface of the optical lens 230 along the first linear polarization direction When the path on the optical lens 230 is incident on the convex spherical surface, the first linear polarization direction The 2D image display light is polarized in the first linear polarization direction according to the refractive index in the shorter axis direction of the optical lens 230. As a result, during the 2D image display period, a 2D image is displayed through the display panel 110 and the optical member 200.

[0124] Fig.14 is a cross-sectional view illustrating light exit paths of a polarization controller and an optical lens of an optical member according to an embodiment during a 3D stereoscopic image display period.

[0125] Reference Fig.14 During the 3D stereoscopic image display period, the display driver 120 supplies 3D image data voltages (eg, MLD and MRD) for displaying a 3D stereoscopic image for each first frame period 1Frame or first and second subframes SF1 and SF2 to the data lines of the display panel 110 .

[0126] All of the first to third sub-pixels SP1, SP2, and SP3 disposed in the display area DA of the display panel 110 may be polarized in the first linear polarization direction according to the orientation of the polarizing plate 201 disposed on the front surface. The 2D image on shows that light is emitted to the front side.

[0127] The display driver 120 may generate a first driving voltage and a second driving voltage to provide them to the first transparent electrode 241 and the second transparent electrode 242 , respectively, such that a voltage difference between the first driving voltage and the second driving voltage is maintained at a predetermined voltage difference or more.

[0128] When the voltage difference between the first transparent electrode 241 and the second transparent electrode 242 is maintained at a predetermined voltage difference or more, the polarization control layer 243 The 2D image shows the optical path of the light converted into a second linear polarization direction Here, the first linear polarization direction It can refer to the direction in which light travels while oscillating in the Z-axis direction, the second linear polarization direction Can refer to the direction in which light travels while oscillating in the X-axis direction.

[0129] When the 2D image displays light along the second linear polarization direction When the light path on the optical lens 230 is incident on the plurality of optical lenses 230, the 2D image display light forms a first linear polarization direction through the optical lens 230 That is, during the 3D stereoscopic image display period, the polarization controller 240 converts the display light of the 2D image displayed in the display area DA into the display light in the second linear polarization direction. Therefore, the 2D image display light incident on the plurality of optical lenses 230 during the 3D stereoscopic image display period is refracted toward each viewpoint by the refractive index of the optical lens 230 and is displayed as a 3D stereoscopic image.

[0130] Fig.15 It is shown along Figure 5 2 is a cross-sectional view of a sub-pixel and an optical member according to an embodiment taken along line II′ shown in FIG.

[0131] like Fig.15 As shown in FIG. 1 , the optical member 200 includes a plurality of optical lenses 230 and a polarization controller 240 that are overlapped and stacked on each other between a first optical sheet 210 and a second optical sheet 220 .

[0132] In an embodiment, the optical lens 230 is disposed between the first optical sheet 210 and the second optical sheet 220 and on the front surface of the first optical sheet 210. In an embodiment, the polarization controller 240 is formed between the first optical sheet 210 and the second optical sheet 220 and on the rear surface of the second optical sheet 220 such that it overlaps and is stacked with the plurality of optical lenses 230.

[0133] In an embodiment, the polarizing plate 201 is attached and formed on the front surface of the first optical sheet 210. In this embodiment, a plurality of optical lenses 230 may be disposed on the front surface of the polarizing plate 201.

[0134] In an embodiment, the optical lens 230 has a flat rear surface attached to the front surface of the first optical sheet 210 and a convex hemispherical surface facing the polarization controller 240. The plurality of optical lenses 230 may form a light propagation path in the first linear polarization direction according to the orientation of the birefringent material of the optical lens 230 itself or the orientation of the birefringent material (such as liquid crystal and slit) included inside the optical lens 230.

[0135] The polarization controller 240 is formed on the front side of the optical lens 230. When the first driving voltage from the display driver 120 is input to the first transparent electrode 241 and the second transparent electrode 242, the polarization controller 240 transmits the 2D image display light incident through the optical lens 230 to the front side while maintaining the light path in the first linear polarization direction.

[0136] In an embodiment, when the first driving voltage and the second driving voltage from the display driver 120 are input to the first transparent electrode 241 and the second transparent electrode 242, respectively, the polarization control layer 243 disposed between the first transparent electrode 241 and the second transparent electrode 242 is converted to make the birefringent material (such as liquid crystal) have a refractive index in the longer axis direction. When the 2D image display light on the image is incident on the polarization controller 240 through the optical lens 230, the polarization control layer 243 has a refractive index in the longer axis direction of the liquid crystal, so that the polarization control layer 243 has a refractive index in the first linear polarization direction. The 2D image display light on FIG. 2 is refracted in the polarization control layer 243 and at the boundary between the polarization control layer 243 and the optical lens 230 toward each viewpoint, respectively, to be emitted in the refracted direction.

[0137] Fig.16 It is shown along Figure 5 2 is a cross-sectional view of a sub-pixel and an optical member according to an embodiment taken along line II′ shown in FIG.

[0138] like Fig.16As shown in , the optical member 200 may further include a plurality of light blocking patterns 221 formed at the rear side of the second optical sheet 220 and in line with contact surfaces between adjacent optical lenses 230 and side edges of the optical lenses 230 .

[0139] The plurality of light blocking patterns 221 are arranged to block image display light distorted at contact regions between the optical lenses 230 and side edges of the optical lenses 230 at the front side of the optical lenses 230 where the second optical sheet 220 is disposed.

[0140] The optical member 200 may further include a planarization layer 222 (see Figure 8 ), planarization layer 222 (see Figure 8 ) provides a flat surface throughout all of the plurality of light blocking patterns 221 formed on the rear side of the second optical sheet 220. The planarization layer 222 (see Figure 8 ) may be formed as a transparent inorganic layer. The polarization controller 240 may be disposed on the planarization layer 222 (see FIG. 21 ) formed on the rear side of the second optical sheet 220. Figure 8 ) is provided on a flat surface. In an embodiment, the light blocking pattern 221 is disposed within the polarization control layer 243 of the polarization controller 240 to contact the second transparent electrode 242.

[0141] Fig.17 It is shown along Figure 5 2 is a cross-sectional view of a sub-pixel and an optical member according to an embodiment taken along line II′ shown in FIG.

[0142] Reference Fig.17 , a plurality of light blocking patterns 221 in line with the contact surfaces between adjacent optical lenses 230 and the side edges of the optical lenses 230 may be formed on the front side of the first optical sheet 210. For example, the light blocking pattern 221 may overlap the contact area between adjacent optical lenses 230 or the side edge of one of the optical lenses 230.

[0143] As described above, the spherical aberration of each optical lens 230 may cause the light exit angle to be inconsistent at the contact area between adjacent optical lenses 230 and the side edge of the optical lens 230. Therefore, a plurality of light blocking patterns 221 may be formed on the side where the first optical sheet 210 is disposed so that the image display light is not incident at the contact area between the optical lenses 230 and the side edge of the optical lens 230.

[0144] In addition, the optical member 200 may further include a planarization layer 222 (see Figure 8 ), planarization layer 222 (see Figure 8 ) provides a flat surface throughout all of the plurality of light blocking patterns 221 formed on the front side of the first optical sheet 210. The planarization layer 222 (see Figure 8) can be formed as a transparent inorganic layer.

[0145] The optical lens 230 may be disposed on the planarization layer 222 (see FIG. Figure 8 ) on a flat surface provided.

[0146] Fig.18 is a cross-sectional view illustrating light exit paths of a polarization controller and an optical lens of an optical member according to an embodiment during a 2D image display period.

[0147] Reference Fig.18 During the 2D image display period, the display driver 120 supplies the 2D image data voltage RGB2D for displaying a 2D image for each first frame period 1Frame or the first and second subframes SF1 and SF2 to the data lines of the display panel 110 .

[0148] All of the first to third sub-pixels SP1, SP2, and SP3 disposed in the display area DA of the display panel 110 may be polarized in the first linear polarization direction according to the orientation of the polarizing plate 201 disposed on the front surface. The 2D image on shows that light is emitted to the front side.

[0149] The light having passed through the polarizer 201 is in the first linear polarization direction. The 2D image display light on the optical lens 230 is incident on the rear surface of the optical lens 230. The light incident on the rear surface of the optical lens 230 is in the first linear polarization direction. The 2D image display light is polarized in the first linear polarization direction as it is according to the refractive index in the shorter axis direction of the optical lens 230. The optical lens 230 is passed upward.

[0150] During the 2D image display period, the display driver 120 may generate the first driving voltage such that the first driving voltage is maintained below a predetermined level (eg, below 0 V or 5 V) to apply them to the first and second transparent electrodes 241 and 242 .

[0151] When the first driving voltage from the display driver 120 is input to the first transparent electrode 241 and the second transparent electrode 242, the polarization controller 240 maintains the first linear polarization direction. The 2D image display light incident through the optical lens 230 is transmitted to the front side while following the optical path on the optical lens 230. As a result, during the 2D image display period, a 2D image is displayed through the display panel 110 and the optical member 200.

[0152] Fig.19is a cross-sectional view illustrating light exit paths of a polarization control layer and an optical lens of an optical member according to an embodiment during a 3D stereoscopic image display period.

[0153] Reference Fig.19 During the 3D stereoscopic image display period, the display driver 120 supplies 3D image data voltages (eg, MLD and MRD) for displaying a 3D stereoscopic image for each first frame period 1Frame or first and second subframes SF1 and SF2 to the data lines of the display panel 110 .

[0154] All of the first to third sub-pixels SP1, SP2, and SP3 disposed in the display area DA of the display panel 110 may be polarized in the first linear polarization direction according to the orientation of the polarizing plate 201 disposed on the front surface. The 2D image on shows that light is emitted to the front side.

[0155] The light having passed through the polarizer 201 is in the first linear polarization direction. The 2D image display light on the optical lens 230 is incident on the rear surface of the optical lens 230. The light incident on the rear surface of the optical lens 230 is in the first linear polarization direction. The 2D image display light is polarized in the first linear polarization direction as it is according to the refractive index in the shorter axis direction of the optical lens 230. The optical lens 230 is passed upward.

[0156] The display driver 120 may generate a first driving voltage and a second driving voltage to provide them to the first transparent electrode 241 and the second transparent electrode 242 , respectively, such that a voltage difference between the first driving voltage and the second driving voltage is maintained at a predetermined voltage difference or more.

[0157] When the first driving voltage and the second driving voltage from the display driver 120 are input to the first transparent electrode 241 and the second transparent electrode 242, respectively, the polarization control layer 243 disposed between the first transparent electrode 241 and the second transparent electrode 242 is converted to make the birefringent material (such as liquid crystal) have a refractive index in the longer axis direction. When the 2D image display light on the image is incident on the polarization controller 240 through the optical lens 230, the polarization control layer 243 has a refractive index in the longer axis direction of the liquid crystal, so that the polarization control layer 243 has a refractive index in the first linear polarization direction. The 2D image display light on the optical lens 230 is refracted in the polarization control layer 243 and toward each viewpoint at a boundary between the polarization control layer 243 and the optical lens 230 to be emitted in a refracted direction.

[0158] Fig. 20 is an exploded perspective view showing a display device according to an embodiment of the present disclosure. Fig.21 It is shown Fig. 20 A plan view of the display panel and optical components shown in FIG.

[0159] Reference Fig. 20 and Fig.21 The display device 290 according to the embodiment may be implemented as a flat panel display device such as an organic light emitting display (OLED), and may be a 3D display including the display module 100 and the optical member 200 .

[0160] The display module 100 may include a display panel 110 , a display driver 120 , and a circuit board 130 .

[0161] The display panel 110 may include a display area DA and a non-display area NDA. The display area DA may include data lines, scan lines, power supply voltage lines, and a plurality of pixels connected to the data lines and the scan lines.

[0162] The optical member 200 may be disposed on the display module 100. The optical member 200 may be attached to the surface of the display module 100 by an adhesive member. The optical member 200 may be attached to the display module 100 by a panel bonding device. For example, the optical member 200 may include a polarization controller 240 and a plurality of optical lenses (e.g., refractive index anisotropic lenses) 230 that are overlapped and stacked with each other between a first optical sheet 210 and a second optical sheet 220.

[0163] During the 2D image display period, the optical member 200 outputs the display light of the 2D image displayed in the display area DA of the display panel 110 along the optical path in the first linear polarization direction without changing the path under the control of the display driver 120. In an embodiment, during the 3D stereoscopic image display period, the optical member 200 converts the display light of the 2D image displayed in the display area DA into light in the optical path in the second linear polarization direction and refracts them under the control of the display driver 120 to output the light and display the 3D stereoscopic image.

[0164] In concluding the detailed description, those skilled in the art will appreciate that many variations and modifications can be made to the described embodiments without substantially departing from the principles of the present disclosure.

Claims

1. A display device, comprising: a display panel configured to display a two-dimensional image; an optical member configured to display the two-dimensional image displayed on the display panel by maintaining a display light path of the two-dimensional image during a two-dimensional image display period, and configured to display a three-dimensional stereoscopic image by refracting the display light path of the two-dimensional image during a three-dimensional stereoscopic image display period; as well as A display driver is configured to drive the display panel so that the display panel displays a multi-view image in the two-dimensional image display period and the three-dimensional stereoscopic image display period, and is configured to apply a driving voltage to the optical member to control the operation of the optical member for displaying the two-dimensional image or the three-dimensional stereoscopic image.

2. The display device according to claim 1, wherein: The optical component comprises: A first optical sheet and a second optical sheet facing each other; a polarization controller disposed between the first optical sheet and the second optical sheet and formed on a front surface of the first optical sheet; and A plurality of optical lenses are disposed on a rear surface of the second optical sheet between the first optical sheet and the second optical sheet to overlap the polarization controller.

3. The display device according to claim 2, wherein: The polarization controller comprises: at least one first transparent electrode disposed on the front surface of the first optical sheet; a polarization control layer formed on a front surface of the at least one first transparent electrode; and at least one second transparent electrode, arranged to face the at least one first transparent electrode, Wherein, the polarization control layer is disposed between the at least one first transparent electrode and the at least one second transparent electrode.

4. The display device according to claim 3, wherein: The polarization control layer includes a birefringent material having a refractive index anisotropy, and Wherein, when the voltage level of the at least one first transparent electrode and the voltage level of the at least one second transparent electrode are equal to each other or the voltage difference between the at least one first transparent electrode and the at least one second transparent electrode is less than a predetermined voltage difference, the birefringent material forms an optical path in a first linear polarization direction; and when the voltage difference between the at least one first transparent electrode and the at least one second transparent electrode is greater than the predetermined voltage difference, the birefringent material forms an optical path in a second linear polarization direction.

5. The display device according to claim 3, wherein: At least one of the at least one first transparent electrode and the at least one second transparent electrode is disposed to cover the same surface of the plurality of optical lenses.

6. The display device according to claim 3, wherein: The display driver divides each frame for displaying the two-dimensional image into a first time-division frame and a second time-division frame, and applies the same driving voltage to the at least one first transparent electrode and the at least one second transparent electrode in each first time-division frame and second time-division frame to control the polarization control layer so that the polarization control layer maintains an optical path in a first linear polarization direction.

7. The display device according to claim 3, wherein: The display driver divides each frame for displaying the three-dimensional stereoscopic image into a first time-division frame and a second time-division frame, and applies a first driving voltage among the driving voltages to the at least one first transparent electrode and a second driving voltage among the driving voltages to the at least one second transparent electrode in each first time-division frame and second time-division frame, so as to control the polarization control layer so that the polarization control layer forms an optical path in a second linear polarization direction, and The first driving voltage and the second driving voltage are voltages of different levels with a predetermined voltage difference.

8. The display device according to claim 2, wherein: The plurality of optical lenses are configured to form an optical path in a first linear polarization direction according to materials of the plurality of optical lenses or an arrangement of birefringent materials therein, wherein the two-dimensional image display light incident along the light path in the first linear polarization direction through the polarization controller is transmitted along the light path in the first linear polarization direction, and Wherein, according to the materials of the plurality of optical lenses or the arrangement of the birefringent materials, the two-dimensional image display light incident along the light path in the second linear polarization direction through the polarization controller is refracted and output as a three-dimensional stereoscopic image.

9. The display device according to claim 2, wherein: The optical member further includes a plurality of light blocking patterns disposed at a rear side of the second optical sheet to overlap contact areas between adjacent ones of the plurality of optical lenses and side edges of the plurality of optical lenses, respectively.

10. The display device according to claim 2, wherein: The optical member further includes a plurality of light blocking patterns disposed at a front side of the first optical sheet to overlap contact areas between adjacent ones of the plurality of optical lenses and side edges of the plurality of optical lenses.

11. The display device according to claim 1, wherein: The optical component comprises: A first optical sheet and a second optical sheet facing each other; a plurality of optical lenses disposed on a front surface of the first optical sheet between the first optical sheet and the second optical sheet; and A polarization controller is formed on a rear surface of the second optical sheet between the first optical sheet and the second optical sheet to overlap the plurality of optical lenses.

12. The display device according to claim 11, wherein: The polarization controller comprises: at least one first transparent electrode disposed on the front surface of the first optical sheet; a polarization control layer disposed on a front surface of the at least one first transparent electrode; and at least one second transparent electrode, arranged to face the at least one first transparent electrode, Wherein, the polarization control layer is disposed between the at least one first transparent electrode and the at least one second transparent electrode.

13. The display device according to claim 12, wherein: The multiple optical lenses are configured to form an optical path in a first linear polarization direction according to the materials of the multiple optical lenses or the arrangement of the birefringent materials therein, and are configured to transmit two-dimensional image display light incident along the optical path in the first linear polarization direction through the display panel without changing the optical path.

14. The display device according to claim 13, wherein: The polarization control layer includes a birefringent material having a refractive index anisotropy, and Wherein, when the voltage level of the at least one first transparent electrode and the voltage level of the at least one second transparent electrode are equal to each other or the voltage difference between the at least one first transparent electrode and the at least one second transparent electrode is less than a predetermined voltage difference, the birefringent material of the polarization control layer forms the optical path in the first linear polarization direction; and when the voltage difference between the at least one first transparent electrode and the at least one second transparent electrode is greater than the predetermined voltage difference, the birefringent material of the polarization control layer forms an optical path in the second linear polarization direction.

15. The display device according to claim 11, wherein: The optical member further includes a plurality of light blocking patterns disposed at a rear side of the second optical sheet to overlap contact areas between adjacent ones of the plurality of optical lenses and side edges of the plurality of optical lenses.

16. The display device according to claim 11, wherein: The optical member further includes a plurality of light blocking patterns disposed at a front side of the first optical sheet to overlap contact areas between adjacent ones of the plurality of optical lenses and side edges of the plurality of optical lenses.

17. A display device, comprising: a display panel configured to display a two-dimensional image; an optical member configured to display the two-dimensional image displayed on the display panel by maintaining a display light path of the two-dimensional image during a two-dimensional image display period, and configured to display a three-dimensional stereoscopic image by refracting the display light path of the two-dimensional image during a three-dimensional stereoscopic image display period; as well as a display driver configured to control the optical member for forming an optical path in a first linear polarization direction or an optical path in a second linear polarization direction in the two-dimensional image display period or the three-dimensional stereoscopic image display period, The display driver drives the display panel so that the display panel displays a multi-view image during the two-dimensional image display period and the three-dimensional stereoscopic image display period, and applies a driving voltage to the optical component to control the operation of the optical component for displaying the two-dimensional image or the three-dimensional stereoscopic image.

18. A display device, comprising: an optical member configured to display the two-dimensional image displayed on the display panel by maintaining a display light path of the two-dimensional image during a two-dimensional image display period, and configured to display a three-dimensional stereoscopic image by refracting the display light path of the two-dimensional image during a three-dimensional stereoscopic image display period, Wherein, the optical component includes: a first optical sheet and a second optical sheet facing each other; a polarization controller, which is arranged on the front surface of the first optical sheet between the first optical sheet and the second optical sheet; and a plurality of optical lenses, which are arranged on the rear surface of the second optical sheet between the first optical sheet and the second optical sheet to overlap with the polarization controller.

19. The display device according to claim 18, wherein: The polarization controller comprises: at least one first transparent electrode disposed on the front surface of the first optical sheet; a polarization control layer disposed on a front surface of the at least one first transparent electrode; and at least one second transparent electrode, arranged to face the at least one first transparent electrode, Wherein, the polarization control layer is disposed between the at least one first transparent electrode and the at least one second transparent electrode.

20. The display device according to claim 19, wherein: The polarization control layer includes a birefringent material having a refractive index anisotropy, and Wherein, when the voltage level of the at least one first transparent electrode and the voltage level of the at least one second transparent electrode are equal to each other or the voltage difference between the at least one first transparent electrode and the at least one second transparent electrode is less than a predetermined voltage difference, the birefringent material of the polarization control layer forms an optical path in a first linear polarization direction; and when the voltage difference between the at least one first transparent electrode and the at least one second transparent electrode is greater than the predetermined voltage difference, the birefringent material of the polarization control layer forms an optical path in a second linear polarization direction.

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