Display device with viewing angle control film

Abstract

Disclosed is a display device having a viewing angle control film that can reduce interference between the panel and the viewing angle control film and effectively block unwanted viewing angle light. The display device includes: a display panel; and a viewing angle control film disposed on the display panel. The viewing angle control film may include multiple light-shielding patterns for blocking light propagating in directions other than the front direction of the display panel during viewing angle control mode. Each of the multiple light-shielding patterns may have a thickness within a range of 8% to 25% of the pixel area of ​​the display panel, a spacing within a range of 33% to 39% of the pixel size, and a tilt angle within a range of ±5° to 15° relative to 90°.

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims the benefit of Korean Patent Application No. 10-2020-0185604, filed on December 29, 2020, which is hereby incorporated by reference as if fully set forth herein. Technical Field

[0003] The present disclosure relates to a display device having a viewing angle control film, which can reduce interference between a panel and the viewing angle control film and effectively block unnecessary viewing angle light. Background Art

[0004] Among display devices built into a vehicle, a display device arranged in front of a passenger seat provides a user with a desired image but includes a viewing angle control film that blocks light emitted toward a driver so as not to disturb the driver while the driver drives the vehicle.

[0005] Because the viewing angle control film provided on the display panel includes a light-shielding pattern for controlling the viewing angle, moire artifacts are generated. This is caused by interference between the pixel structure of the display panel and the light-shielding pattern of the viewing angle control film, thereby degrading display performance. In this regard, a method for reducing moire artifacts is needed.

[0006] In addition, the viewing angle control film further requires a method to effectively block unnecessary viewing angle light directed toward the driver.

[0007] The disclosure of the above-mentioned background technology is mastered by the inventor of the present disclosure in order to design the present disclosure, or is technical information obtained through the process of designing the present disclosure, but cannot be regarded as known technology disclosed to the public before the disclosure of the present disclosure. Summary of the Invention

[0008] One or more embodiments of the present disclosure provide a display device having a viewing angle control film, which can reduce an interference phenomenon between a panel and the viewing angle control film and effectively block unnecessary viewing angle light.

[0009] In addition to the technical advantages of the present disclosure described above, those skilled in the art will clearly understand other technical advantages and features of the present disclosure from the following description of the present disclosure.

[0010] According to one aspect of the present disclosure, a display device may include: a display panel; and a viewing angle control film arranged on the display panel, wherein the viewing angle control film may include a plurality of shading patterns for blocking light propagating in a lateral direction other than a front direction of the display panel in a viewing angle control mode, and each of the plurality of shading patterns may have: a thickness in a range of 8% to 25% of a pixel area of ​​the display panel, an interval in a range of 33% to 39% of the pixel size, and a tilt angle in a range of ±5° to 15° based on 90°.

[0011] In addition to the above-mentioned features of the present disclosure, other technical advantages and features of the present disclosure are included in this description, which are within the scope of the present disclosure and protected by the subsequent claims. This section should not be construed as limiting the claims. Other aspects and advantages are discussed below in conjunction with the embodiments of the present disclosure. It should be understood that the foregoing general description of the present disclosure and the following detailed description are illustrative and explanatory and are intended to provide further explanation of the claimed inventive concepts. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The accompanying drawings, which are included to provide a further understanding of the present disclosure and are incorporated in and constitute a part of this application, illustrate embodiments of the present disclosure and, together with the description, serve to explain the principles of the present disclosure. In the drawings:

[0013] Figure 1 is a schematic diagram illustrating the structure of a display device having a viewing angle control film according to one embodiment of the present disclosure;

[0014] Figure 2 is a perspective view illustrating the structure of a viewing angle control film according to one embodiment of the present disclosure;

[0015] Figure 3 is a top view illustrating a viewing angle control film according to one embodiment of the present disclosure;

[0016] Figure 4A 、 Figure 4B 、 Figure 5A and Figure 5B is a diagram illustrating operating states of a viewing angle control mode and a viewing angle non-control mode of a viewing angle control film according to one embodiment of the present disclosure;

[0017] Figure 6 is a diagram illustrating a stripe artifact phenomenon of a display device according to the related art;

[0018] Figure 7 is a flow chart illustrating a method for deriving a design range of a viewing angle control film according to one embodiment of the present disclosure;

[0019] Figure 8A and Figure 8B is a diagram illustrating three design parameters of a light-shielding pattern in a viewing angle control film according to one embodiment of the present disclosure;

[0020] Figures 9A to 9C is a diagram illustrating a target design range of a viewing angle control film according to one embodiment of the present disclosure;

[0021] Figure 10 is a diagram illustrating a stripe level based on a size change of a pixel and a shape change of a pixel in a display device having a viewing angle control film according to an embodiment of the present disclosure;

[0022] Figure 11 is a diagram illustrating differentiated application of intervals of a light-shielding pattern of a viewing angle control film according to one embodiment of the present disclosure;

[0023] Figure 12 is a diagram illustrating differentiated application of thickness of a light-shielding pattern of a viewing angle control film according to one embodiment of the present disclosure;

[0024] Figure 13A and Figure 13B is a diagram illustrating an adjustment range of intervals of light-shielding patterns in a viewing angle control film according to one embodiment of the present disclosure;

[0025] Figure 14 is a diagram illustrating differentiated application of the height of a light-shielding pattern of a viewing angle control film according to one embodiment of the present disclosure;

[0026] Figure 15 is a diagram illustrating differentiated application of intervals, thicknesses, and heights of light-shielding patterns of a viewing angle control film according to one embodiment of the present disclosure;

[0027] Figure 16 and Figure 17 is a diagram illustrating a method for compensating for brightness deviation due to differentiated application of intervals of light-shielding patterns of a viewing angle control film according to one embodiment of the present disclosure. DETAILED DESCRIPTION

[0028] The advantages and features of the present disclosure and their implementation methods will be illustrated by the following embodiments described with reference to the accompanying drawings. However, the present disclosure can be implemented in various forms and should not be construed as limited to the embodiments listed herein. Rather, these embodiments are provided to make the disclosure comprehensive and complete and to fully convey the scope of the disclosure to those skilled in the art. Furthermore, the present disclosure is limited only by the scope of the claims.

[0029] The shapes, sizes, proportions, angles and quantities disclosed in the accompanying drawings for the purpose of describing the embodiments of the present disclosure are merely examples, and the present disclosure is not limited to the illustrated details. The same reference numerals refer to the same elements throughout. In the following description, when it is determined that a detailed description of a related known function or structure would unnecessarily obscure the focus of the present disclosure, the detailed description will be omitted. Where "including", "having" and "comprising" are used in this application for description, other parts may be added unless "only" is used. Terms in the singular may include plural forms unless otherwise indicated.

[0030] When interpreting an element, even if not explicitly stated, the element should be interpreted as including a range of error.

[0031] When describing a positional relationship, for example, when the positional relationship between two parts is described as "on", "above", "below", and "after", one or more other parts may be set between the two parts, unless limiting terms such as "immediately" or "directly" are used.

[0032] When describing a temporal relationship, for example, when a time sequence is described as "after," "subsequently," "next," and "before," discontinuous cases may be included unless limiting terms such as "immediately," "immediately," or "directly" are used.

[0033] It will be understood that although the terms "first," "second," etc. may be used herein to describe various elements, these elements should not be limited by these terms. These terms are merely used to distinguish one element from another. For example, a first element may be referred to as a second element, and similarly, a second element may be referred to as a first element without departing from the scope of this disclosure.

[0034] When describing the elements of the present disclosure, terms such as "first," "second," "A," "B," "(a)," "(b)," etc. may be used. These terms are intended to distinguish the corresponding elements from other elements, and these terms should not limit the nature, order, or quantity of the corresponding elements. When an element or layer is referred to as being "connected to," "bound to," or "attached to" another element or layer, the element or layer may be directly connected to or attached to the other element or layer, and may also be indirectly connected to or attached to the other element or layer with one or more intervening elements or layers disposed therebetween, unless otherwise indicated.

[0035] The term "at least one" should be understood to include any and all combinations of one or more of the relevant listed elements. For example, "at least one or more of the first element, the second element, and the third element" may refer to all combinations of two or more elements selected from the first element, the second element, and the third element, as well as the first element, the second element, or the third element.

[0036] Those skilled in the art will fully understand that the features of the various embodiments of the present disclosure may be combined or combined in part or in whole, and may interoperate and drive each other in various technical aspects. The embodiments of the present disclosure may be implemented independently of each other, or implemented together in a mutually dependent relationship.

[0037] Hereinafter, embodiments of the present disclosure will be described with reference to the accompanying drawings. Since the scale of each element shown in the drawings is different from the actual scale for the convenience of description, the present disclosure is not limited to the scale shown.

[0038] Figure 1 is a schematic diagram illustrating the structure of a display device having a viewing angle control film according to one embodiment of the present disclosure, Figure 2 and Figure 3 are perspective views and top views illustrating a viewing angle control film according to one embodiment of the present disclosure, Figure 4A 、 Figure 4B 、 Figure 5A and Figure 5B 2 is a diagram illustrating operation states of a viewing angle control mode and a viewing angle non-control mode of a viewing angle control film according to one embodiment of the present disclosure.

[0039] Reference Figure 1 , a display device according to one embodiment of the present disclosure may include a viewing angle control film 200 and a cover substrate 300 disposed on a display panel 100 .

[0040] The display panel 100 may include a display portion 110 including a pixel array provided with a plurality of pixels, a polarizer 120 provided on the display portion 110, and a touch sensor 130 provided on the polarizer 120. The display panel 100 may omit the touch sensor 130.

[0041] The display panel 100 may be any of various display panels, such as a liquid crystal display panel, an electroluminescent display panel, and a micro light emitting diode (LED) display panel. The electroluminescent display panel may be an organic light emitting diode (OLED) display panel, a quantum dot light emitting diode display panel, or an inorganic light emitting diode display panel.

[0042] Reference Figure 2 and Figure 3The viewing angle control film 200 may include: a first substrate 210 provided with a first transparent electrode; a second substrate 220 provided with a second transparent electrode; a transparent insulating layer 230 provided between the first substrate 210 and the second substrate 220; and a light-shielding pattern 250 provided in a plurality of grooves formed in the transparent insulating layer 230.

[0043] Each of the first transparent electrode provided in the first substrate 210 and the second transparent electrode provided in the second substrate 220 may be supplied with a driving voltage applied from a driving circuit through the FPC 260 .

[0044] The light-shielding pattern 250 may be formed of a light-shielding material that absorbs light, and may be formed of electronic ink including light-shielding particles that move according to a voltage applied to the first and second transparent electrodes.

[0045] The light shielding pattern 250 is provided to overlap with the display area 240 where the pixel array for displaying an image on the display panel 100 is located. The display area 240 has a structure surrounded by a frame area 242. The light shielding pattern 250 can be provided in a diagonal oblique line shape in the display area 240, but is not limited thereto and can be provided in various shapes.

[0046] The light shielding pattern 250 may be driven according to a driving voltage applied to the first and second transparent electrodes of the first and second substrates 210 and 220 , thereby adjusting a light shielding height according to a viewing angle control mode and a viewing angle non-control mode.

[0047] Reference Figure 4A and Figure 5A In the viewing angle control mode, the light shielding pattern 250, driven by the first driving voltage applied to the first and second transparent electrodes of the first and second substrates 210 and 220, can diffuse throughout all the grooves of the transparent insulating layer 230, thereby increasing the light shielding height of the light shielding pattern 250 to be equal to the groove height. In the viewing angle control mode, the viewing angle control film 200 can transmit light emitted from the display panel 100 forward, but light propagating to the left or right of the driver can be blocked by the light shielding pattern 250.

[0048] Refer to the figure Figure 4B and Figure 5BIn the non-viewing angle control mode, the light shielding pattern 250 can be driven according to the second driving voltage applied to the first and second transparent electrodes of the first and second substrates 210 and 220, thereby reducing the light shielding height of the light shielding pattern 250 so that the light shielding pattern 250 is located only at the bottom of the transparent insulating layer 230 adjacent to the display panel 100. In the non-viewing angle control mode, the viewing angle control film 200 can transmit light emitted from the display panel 100 in the forward and side directions. Therefore, when the driver wishes to view the image displayed on the display panel 100, such as when not driving the vehicle, the viewing angle control film 200 can be driven in the non-viewing angle control mode, thereby providing the image displayed on the display panel 100 to viewers in the driver and passenger seats.

[0049] Figure 6 is a diagram illustrating a stripe artifact phenomenon of a display device according to the related art.

[0050] Reference Figure 6 In a display device 500 arranged opposite to a passenger seat of a vehicle, when the viewing angle control film is driven in the viewing angle control mode, light directed toward the driver can be blocked, so that the driver can see a black screen 500A, but a viewer in the passenger seat can see an image 500B in which stripe artifacts are generated due to the viewing angle control film.

[0051] To mitigate such streak artifacts, according to one embodiment, the design range of the viewing angle control film may be derived as follows.

[0052] Figure 7 is a flow chart illustrating a method for deriving a design range of a viewing angle control film according to one embodiment of the present disclosure.

[0053] Reference Figure 7 According to one embodiment, a method for deriving a design range for a viewing angle control film may include: applying the specifications of a display panel (pixel size) (S702); applying arbitrary specifications of the viewing angle control film (thickness, spacing, and tilt angle of the shading pattern) (S704); simulating streak artifacts (S706); and evaluating the streak level (S708). When the evaluation score of the streak pattern is greater than a threshold value "th" (S710), the corresponding specifications of the viewing angle control film (thickness, spacing, and tilt angle of the shading pattern) may be determined to be suitable for the design range of the viewing angle control film (S712). On the other hand, when the evaluation score of the streak pattern is less than or equal to the threshold value "th" (S710), the corresponding specifications of the viewing angle control film (thickness, spacing, and tilt angle of the shading pattern) may be excluded from the design range (S714). The method for deriving a design range for a viewing angle control film may be repeated, thereby determining a design range for a viewing angle control film for reducing streak artifacts (S712).

[0054] The method for deriving the design range of the viewing angle control film according to one embodiment can be performed by repeating Figure 7 The target ranges of thickness, spacing, and tilt angle of the light-shielding pattern (ie, three design elements of the viewing angle control film) are calculated by the steps of FIG. 1 and stripe artifacts can be mitigated.

[0055] Figure 8A and Figure 8B is a diagram illustrating design parameters of a light-shielding pattern in a viewing angle control film according to one embodiment of the present disclosure.

[0056] Reference Figure 8A and Figure 8B In order to reduce the stripe artifact, the viewing angle control film 200 may have an optimal design range in the interval W between the light shielding patterns 250 , the thickness d of the light shielding pattern 250 , and the tilt angle θ of the light shielding pattern 250 .

[0057] For example, in the viewing angle control mode, to reduce streak artifacts, the viewing angle control film according to one embodiment is preferably designed such that the thickness d of the light-shielding pattern 250 is within a range of 8% to 25% of the pixel size, the interval W between the light-shielding patterns 250 is within a range of 33% to 39% of the pixel size, and the tilt angle θ of the light-shielding pattern 250 is within a range of ±5° to 15° with respect to 90°, i.e., 95° to 105° and 75° to 85°. The pixel size represents the area of ​​the pixel.

[0058] Figures 9A to 9C is a diagram illustrating a target design range of a viewing angle control film according to one embodiment of the present disclosure.

[0059] Reference Figures 9A to 9C , under the conditions that the thickness of the shading pattern (resin) is 8%, 16% or 25% of the pixel size, the interval of the shading pattern (resin) is in the range of 33% to 39% of the pixel size, and the inclination angle of the shading pattern (based on 90°) is within the design range of ±5° to 15°, it is noted that the evaluation score of the stripe pattern is above the target range (for example, above 4 points), reducing the stripe artifact to a level acceptable to the viewer.

[0060] Figure 10 is a diagram illustrating a stripe level based on a size change of a pixel and a shape change of a pixel in a display device having a viewing angle control film according to an embodiment of the present disclosure.

[0061] Reference Figure 10When the viewing angle control film according to one embodiment had the light shielding pattern specifications A (thickness, spacing, and tilt angle) within the target range, the streak level was evaluated, and it was found that the streak level was similar depending on the pixel shape or pixel size. Therefore, the design range of the viewing angle control film derived in one embodiment can be applied to display panels with various pixel shapes and sizes.

[0062] In addition, when the viewing angle control film has specifications B and C (thickness, interval, and tilt angle) outside the target range, it is noted that the streak level can be recognized, but the recognized streak level is almost the same depending on the shape change of the pixel or the size change of the pixel.

[0063] In the viewing angle control film 200 of the display device according to one embodiment, the interval W, thickness d, height H, etc. of the light shielding pattern 250 can be adjusted differently depending on the position on the display panel 100. Therefore, in the viewing angle control mode, the brightness (transmittance) of the display panel 100 provided to the first viewer at the passenger seat (first viewing position) can be increased by the driven viewing angle control film 200, and light directed to the driver (second viewer) at the driver's seat (second viewing position) can be effectively blocked.

[0064] Figure 11 is a diagram illustrating differentiated application of intervals of a light-shielding pattern of a viewing angle control film according to one embodiment of the present disclosure, Figure 12 is a diagram illustrating differentiated application of thickness of a light-shielding pattern of a viewing angle control film according to one embodiment of the present disclosure, Figure 13A and Figure 13B is a diagram illustrating an adjustment range of intervals of light-shielding patterns in a viewing angle control film according to one embodiment of the present disclosure, Figure 14 is a diagram illustrating differentiated application of the height of the light-shielding pattern of the viewing angle control film according to one embodiment of the present disclosure, Figure 15 is a diagram illustrating differentiated application of intervals, thicknesses, and heights of light-shielding patterns of a viewing angle control film according to one embodiment of the present disclosure, Figure 16 and Figure 17 is a diagram illustrating a method for compensating for brightness deviation due to differentiated application of intervals of light-shielding patterns of a viewing angle control film according to one embodiment of the present disclosure.

[0065] Reference Figure 11 In the viewing angle control film 200 according to one embodiment, the intervals W between the light shielding patterns 250 may be set differently according to positions on the display panel 100 in consideration of the position of the driver. S and W E, and the thickness and height H of each light shielding pattern 250 may be set equally. For a position close to the driver on the display panel 100, the first interval W between the light shielding patterns 250 is S It can be set to be relatively small, and for a position far from the driver, the second interval W between the light shielding patterns 250 is E Can be set to be larger than the first interval W S .

[0066] The interval W between the light shielding patterns 250 based on the position on the display panel 100 S and W E Ke Ru Figure 11 , and can be expressed by the following equation 1.

[0067] [Equation 1]

[0068]

[0069]

[0070] exist Figure 11 And in the above equation 1, W S The first interval W between the light shielding patterns 250 may refer to a first position on the display panel 100 that is relatively close to the driver, that is, a first interval W between the light shielding patterns 250 in a first position on the display panel 100 that has a first horizontal distance S from the driver. S .W E The second interval W between the light shielding patterns 250 may refer to a second position on the display panel 100 that is away from the driver, that is, a second position on the display panel 100 that has a second horizontal distance E greater than the first horizontal distance S from the driver. E H may refer to the height of the light shielding pattern 250. θ S θ may refer to the angle of light emitted from a first position of the display panel 100 relatively close to the driver toward the driver, which may be determined by an arctangent function of a vertical distance D and a first horizontal distance S between the driver and the display panel 100. E It may refer to an angle of light emitted from a second position of the display panel 100 relatively far from the driver toward the driver, which may be determined by an arctangent function of a vertical distance D and a second horizontal distance E between the driver and the display panel 100 .

[0071] Reference Figure 11 and Equation 1, in the first position of the display panel 100 relatively close to the driver, the first interval W between the light shielding patterns 250 is S The height H of the light shielding pattern 250 and the light emitting angle θ of the display panel 100 can be used to determine the light shielding pattern 250. S In the second position of the display panel 100 relatively far from the driver, the second interval W between the light shielding patterns 250 is determined.E The height H of the light shielding pattern 250 and the light emitting angle θ of the display panel 100 can be used to determine the light shielding pattern 250. E The ratio of the tangent functions is determined.

[0072] Reference Figure 12 In the viewing angle control film 200A according to one embodiment, the thickness d of the light shielding patterns 250A and 250B may be set differently according to the position on the display panel 100 in consideration of the position of the driver. S and d E and the interval W between the light shielding patterns 250A and 250B S and W E , and the height of each light shielding pattern 250 may be set equally. The first thickness d of the first light shielding pattern 250A provided in the first position close to the driver on the display panel 100 is S The first interval W between the first light shielding patterns 250A can be set to be relatively large. S The second thickness d of the second light shielding pattern 250B disposed in the second position away from the driver may be set to be relatively small. E Can be set to be smaller than the first thickness d S , and the second interval W between the second light shielding patterns 250B E Can be set to be larger than the first interval W S .

[0073] The first interval W between the first light shielding patterns 250A based on the position on the display panel 100 S and a second interval W between the second light-shielding pattern 250B. E It can be determined as in the above equation 1. With a first interval W S The first light-shielding pattern 250A has a first thickness d S and having a second interval W E The second thickness d of the second light-shielding pattern 250B E Ke Ru Figure 12 is determined as shown in and expressed by the following equation 2.

[0074] [Equation 2]

[0075] d S =WW s , d E =WW E

[0076] exist Figure 12 In the above-mentioned Equation 2, W may refer to a certain interval W between the light-shielding patterns 250A and 250B.

[0077] Reference Figure 12and Equation 2, with a first spacing W in a first position close to the driver S The first light-shielding pattern 250A has a first thickness d S The certain interval W and the first interval W S and has a second interval W in a second position away from the driver. E The second thickness d of the second light-shielding pattern 250B E The certain interval W and the second interval W E The difference between them is determined.

[0078] Reference Figure 13A , the interval W between the light shielding patterns 250 S and W E It can be set to increase with the increase of the horizontal distance S and E from the driver, but if Figure 13B Their variable range shown in can be set as a threshold value Th and thus limited to a range of 33% to 39% of the pixel size, thereby preventing stripes from occurring when the threshold value Vth is exceeded.

[0079] Reference Figure 14 In the viewing angle control film 200C according to one embodiment, the heights H of the light shielding patterns 250C and 250D may be set differently according to the positions on the display panel 100 in consideration of the position of the driver. S and H E , the interval W between the light shielding patterns 250C and 250D may be set equally, and the thicknesses of the light shielding patterns 250C and 250D may be set equally. For a position close to the driver on the display panel 100, the first height H of the first light shielding pattern 250C may be set to be equal to the height H of the first light shielding pattern 250C. S It can be set to be relatively high, and for a position far from the driver, the second height H of the second light shielding pattern 250D is E Can be set to be lower than the first height H S .

[0080] The height H of the light shielding patterns 250C and 250D based on the position on the display panel 100 S and H E Ke Ru Figure 14 is determined as shown in and expressed by the following equation 3.

[0081] [Equation 3]

[0082] H S =W×tanθ S , H E =W×tanθ E

[0083]

[0084] exist Figure 14 And in the above equation 3, H S The first height H of the first light shielding pattern 250C may refer to a first position on the display panel 100 relatively close to the driver, that is, a first position on the display panel 100 having a first horizontal distance S from the driver. S . H E The second height H of the second light shielding pattern 250D may refer to a second position on the display panel 100 that is away from the driver, that is, a second position on the display panel 100 that has a second horizontal distance E greater than the first horizontal distance S from the driver. E θ S θ may refer to the angle of light emitted from a first position of the display panel 100 relatively close to the driver toward the driver, which may be determined by an arctangent function of a vertical distance D and a first horizontal distance S between the driver and the display panel 100. E It may refer to an angle of light emitted from a second position of the display panel 100 relatively far from the driver toward the driver, which may be determined by an arctangent function of a vertical distance D and a second horizontal distance E between the driver and the display panel 100 .

[0085] Reference Figure 14 According to Equation 3, in the first position of the display panel 100 relatively close to the driver, the first height H of the first light shielding pattern 250C is S The light emitting angle θ of the display panel 100 can be S The second height H of the second light shielding pattern 250D is determined by multiplying the tangent function of and the interval W between the first light shielding patterns 250C. In the second position of the display panel 100 relatively far from the driver, the second height H of the second light shielding pattern 250D is E The light emitting angle θ of the display panel 100 can be E The multiplication result of the tangent function of and the interval W between the second light shielding patterns 250D is determined.

[0086] Reference Figure 15 In the viewing angle control film 200E according to one embodiment, the thickness d of the light shielding patterns 250E and 250F may be set differently according to the position on the display panel 100 in consideration of the position of the driver. S and d E , the interval W between the light shielding patterns 250E and 250F S and W E , and the height H of the light shielding patterns 250E and 250F S and H E .

[0087] exist Figure 15 The thickness d of the light shielding patterns 250E and 250F is determined according to the position on the display panel 100 in consideration of the position of the driver. S and dE , the interval W between the light shielding patterns 250E and 250F S and W E , and the height H of the light shielding patterns 250E and 250F S and H E It can be determined by the aforementioned equations 1 to 3.

[0088] exist Figure 15 , the first thickness d of the first light shielding pattern 250E provided in the first position close to the driver on the display panel 100 is S and the first height H S can be set to be relatively large, and the first interval W between the first light shielding patterns 250E S The second thickness d of the second light shielding pattern 250F disposed in the second position away from the driver may be set to be relatively small. E and the second height H E can be set to be smaller than the first thickness d S and the first height H S , and the second interval W between the second light shielding patterns 250F E Can be set larger than the first interval W S .

[0089] In this way, a viewing angle control film according to one embodiment and a display device having the viewing angle control film can improve the transmittance of the viewing angle control film by taking into account the position of the driver and differentially applying the thickness and spacing of the shading pattern of the viewing angle control film according to the position on the display panel, thereby improving the brightness of the display device.

[0090] According to one embodiment, a viewing angle control film and a display device having the same can save manufacturing costs of the viewing angle control film by differentially applying the height of a light shielding pattern of the viewing angle control film according to positions on a display panel in consideration of a driver's position.

[0091] Reference Figure 16 and Figure 17 , when the interval W between the light shielding patterns 250 in the viewing angle control film according to one embodiment is differentially applied according to positions S and W E When the horizontal distance S and E from the driver increases, the interval W between the light shielding patterns 250 increases. S and W E Increase, thereby the transmittance of light propagating toward the front, that is, the brightness F1 can be increased from L S Increase to L E , so brightness deviation (transmittance deviation) may occur depending on the position of the display panel.

[0092] Reference Figure 16, by making the low brightness L in the display panel S Equal to high brightness L E The interval W between the light shielding patterns 250 in the viewing angle control film is set to S and W E The brightness F1 at each position obtained by the differentiated application of the luminance F2 is increased, thereby uniformly compensating for the brightness deviation. As a result, the picture quality can be improved, and the overall brightness of the display device can be increased.

[0093] Reference Figure 17 , by making the high brightness L in the display panel E Equal to low brightness L S The interval W between the light shielding patterns 250 in the viewing angle control film is set to S and W E The brightness F1 of each position obtained by the differentiated application of is reduced to the brightness F3, thereby uniformly compensating for the brightness deviation. As a result, the picture quality can be improved and the power consumption of the display device can be reduced.

[0094] In a display device according to one or more embodiments of the present disclosure, since the viewing angle control film has a thickness range, angle range, and spacing range of a shading pattern designed to minimize stripe artifacts, stripe artifacts can be minimized without being affected by the pixel shape and pixel size of the display panel, thereby improving display performance.

[0095] In a display device according to one or more embodiments of the present disclosure, at least one of the spacing, thickness and height of the shading pattern can be applied differentially according to the position at different distances from the driver on the display panel, thereby effectively blocking unnecessary viewing angle light toward the driver and at the same time improving the brightness of the image provided to the viewer in the passenger seat or reducing the manufacturing cost of the viewing angle control film.

[0096] The display device according to one or more embodiments of the present disclosure can provide uniform brightness by compensating for brightness deviations at different locations caused by differentiated application of at least one of the spacing and thickness of the shading pattern in the viewing angle control film, thereby improving display performance, increasing brightness, or reducing power consumption.

[0097] A display device according to one or more embodiments of the present disclosure will be described as follows.

[0098] A display device according to an embodiment of the present disclosure may include: a display panel; and a viewing angle control film arranged on the display panel, wherein the viewing angle control film may include a plurality of shading patterns for blocking light propagating in a lateral direction other than the front direction of the display panel in a viewing angle control mode, and each of the plurality of shading patterns may have: a thickness in the range of 8% to 25% of the pixel area of ​​the display panel, an interval in the range of 33% to 39% of the pixel size, and an inclination angle in the range of ±5° to 15° based on 90°.

[0099] The viewing angle control film may include: a first substrate provided with a first transparent electrode; a second substrate provided with a second transparent electrode; and a transparent insulating layer provided between the first substrate and the second substrate, the transparent insulating layer having a groove, and the multiple shading patterns are provided in the groove, and the shading height of each of the multiple shading patterns can be changed in a viewing angle control mode and a viewing angle non-control mode according to the driving voltage applied to the first transparent electrode and the second transparent electrode.

[0100] The viewing angle control film is located in a lateral direction of the display panel, and considering the position of a viewer to whom the viewing angle control mode is applied, at least one of the thickness, interval and height of the plurality of light shielding patterns may be set differently according to the position on the display panel.

[0101] In the viewing angle control film, a first interval of a first light-shielding pattern located in a first position close to the viewer may be set to be smaller than a second interval of a second light-shielding pattern located in a second position farther from the viewer than the first position, a thickness of the first light-shielding pattern may be equal to a thickness of the second light-shielding pattern, and a height of the first light-shielding pattern may be equal to a height of the second light-shielding pattern.

[0102] In the viewing angle control film, the first thickness of the first light-shielding pattern located in a first position close to the viewer can be set to be greater than the second thickness of the second light-shielding pattern located in a second position farther from the viewer than the first position, the first interval between the first light-shielding patterns can be set to be smaller than the second interval between the second light-shielding patterns, and the height of the first light-shielding pattern can be equal to the height of the second light-shielding pattern.

[0103] In the viewing angle control film, a first height of a first light-shielding pattern located in a first position close to the viewer may be set to be higher than a second height of a second light-shielding pattern located in a second position farther from the viewer than the first position, a thickness of the first light-shielding pattern may be equal to a thickness of the second light-shielding pattern, and an interval between the first light-shielding patterns may be equal to an interval between the second light-shielding patterns.

[0104] In the viewing angle control film, the first thickness of the first shading pattern located in a first position close to the viewer can be set to be greater than the second thickness of the second shading pattern located in a second position farther from the viewer than the first position, the first interval between the first shading patterns can be set to be smaller than the second interval between the second shading patterns, and the first height of the first shading pattern can be set to be higher than the second height of the second shading pattern.

[0105] In the viewing angle control film, intervals between the light shielding patterns may gradually increase as the light shielding patterns move away from the viewer.

[0106] In the viewing angle control film, as the light shielding patterns are away from the viewer, intervals between the light shielding patterns may gradually increase, and thicknesses of the light shielding patterns may gradually decrease.

[0107] In the viewing angle control film, a height of the light shielding pattern may gradually decrease as the light shielding pattern moves away from the viewer.

[0108] In the viewing angle control film, as the light shielding patterns are away from the viewer, intervals between the light shielding patterns may gradually increase, thicknesses of the light shielding patterns may gradually decrease, and heights of the light shielding patterns may gradually decrease.

[0109] The interval between the light shielding patterns, which increases according to the distance between the viewer and the light shielding pattern, may be set within a threshold value that limits the interval to within a range of 33% to 39% of the pixel size.

[0110] The transmittance deviation of the viewing angle control film caused by the intervals between the light shielding patterns being different according to the position of the display panel may be compensated by brightness control of the display panel.

[0111] It is obvious to those skilled in the art that the present disclosure is not limited to the above-mentioned embodiments and drawings, and that various substitutions, modifications, and variations may be made in the present disclosure without departing from the spirit or scope of the present disclosure. Therefore, the scope of the present disclosure is defined by the appended claims, and all variations or modifications derived from the meaning, scope, and equivalents of the claims fall within the scope of the present disclosure.

Claims

1. A display device, comprising: Display panel; and A viewing angle control film is provided on the display panel, The viewing angle control film includes a plurality of light shielding patterns for shielding light propagating in a side direction other than a front direction of the display panel in a viewing angle control mode. Each of the plurality of light shielding patterns has a thickness within a range of 8% to 25% of a pixel size of the display panel, an interval within a range of 33% to 39% of the pixel size, and an inclination angle within a range of ±5° to 15° with respect to 90°. In the viewing angle control film, a first interval of a first light-shielding pattern located at a first position close to a viewer to which the viewing angle control mode is applied is set to be smaller than a second interval of a second light-shielding pattern located at a second position farther from the viewer than the first position. The first interval between the first shading patterns is set by applying the vertical distance between the viewer and the display panel, the first horizontal distance between the viewer and the first position of the display panel, and the height of the first shading pattern, and the second interval between the second shading patterns is set by applying the vertical distance between the viewer and the display panel, the second horizontal distance between the viewer and the second position of the display panel, and the height of the second shading pattern.

2. A display device comprising: Display panel; and A viewing angle control film is provided on the display panel, The viewing angle control film includes a plurality of light shielding patterns for shielding light propagating in a side direction other than a front direction of the display panel in a viewing angle control mode. Each of the plurality of light shielding patterns has a thickness within a range of 8% to 25% of a pixel size of the display panel, an interval within a range of 33% to 39% of the pixel size, and an inclination angle within a range of ±5° to 15° with respect to 90°. In the viewing angle control film, a first height of a first light-shielding pattern located at a first position close to a viewer to which the viewing angle control mode is applied is set higher than a second height of a second light-shielding pattern located at a second position farther from the viewer than the first position. The first height of the first shading pattern is set by applying the vertical distance between the viewer and the display panel, the first horizontal distance between the viewer and the first position of the display panel, and the intervals between the first shading patterns, and the second height of the second shading pattern is set by applying the vertical distance between the viewer and the display panel, the second horizontal distance between the viewer and the second position of the display panel, and the intervals between the second shading patterns.

3. The display device according to claim 1 or 2, wherein the viewing angle control film comprises: a first substrate provided with a first transparent electrode; a second substrate provided with a second transparent electrode; as well as A transparent insulating layer is provided between the first substrate and the second substrate, wherein the transparent insulating layer has a groove, and the plurality of light shielding patterns are provided in the groove. A light shielding height of each of the plurality of light shielding patterns varies in a viewing angle control mode and a viewing angle non-control mode according to a driving voltage applied to the first transparent electrode and the second transparent electrode.

4. The display device according to claim 1, wherein In the viewing angle control film, a thickness of the first light-shielding pattern is equal to a thickness of the second light-shielding pattern, and a height of the first light-shielding pattern is equal to a height of the second light-shielding pattern.

5. The display device according to claim 1, wherein In the viewing angle control film, a first thickness of the first light-shielding pattern is set to be greater than a second thickness of the second light-shielding pattern, and a height of the first light-shielding pattern is equal to a height of the second light-shielding pattern. The display device according to claim 2 , wherein: In the viewing angle control film, a thickness of the first light-shielding pattern is equal to a thickness of the second light-shielding pattern, and an interval between the first light-shielding patterns is equal to an interval between the second light-shielding patterns.

7. The display device according to claim 1, wherein In the viewing angle control film, a first thickness of the first light-shielding pattern is set to be greater than a second thickness of the second light-shielding pattern, and a first height of the first light-shielding pattern is set to be higher than a second height of the second light-shielding pattern.

8. The display device according to claim 2, wherein: In the viewing angle control film, a first thickness of the first light-shielding pattern is set to be greater than a second thickness of the second light-shielding pattern, and a first interval between the first light-shielding patterns is set to be smaller than a second interval between the second light-shielding patterns.

9. The display device according to any one of claims 5 and 7, wherein the first thickness of the first light-shielding pattern is set according to the first interval between the first light-shielding patterns, and the second thickness of the second light-shielding pattern is set according to the second interval between the second light-shielding patterns.

10. The display device according to claim 1 or 2, wherein: In the viewing angle control film, intervals between the light shielding patterns gradually increase as the light shielding patterns are farther away from the viewer.

11. The display device according to claim 1 or 2, wherein: In the viewing angle control film, as the light shielding patterns are away from the viewer, intervals between the light shielding patterns gradually increase, and thicknesses of the light shielding patterns gradually decrease.

12. The display device according to claim 1 or 2, wherein: In the viewing angle control film, a height of the light shielding pattern gradually decreases as the light shielding pattern moves away from the viewer.

13. The display device according to claim 1 or 2, wherein: In the viewing angle control film, as the light shielding patterns are away from the viewer, intervals between the light shielding patterns gradually increase, thicknesses of the light shielding patterns gradually decrease, and heights of the light shielding patterns gradually decrease. 14 . The display device according to claim 1 , wherein a transmittance deviation of the viewing angle control film caused by the intervals between the light shielding patterns being different depending on the position of the display panel is compensated by brightness control of the display panel.

Images