Display device

Abstract

A display device includes a first substrate, a second substrate, a liquid crystal layer, a first electrode, a first optical element, and a second optical element. The second substrate is disposed opposite to the first substrate. The liquid crystal layer is disposed between the first substrate and the second substrate. When the display device is not enabled, a plurality of liquid crystal molecules in the liquid crystal layer have an initial alignment direction. The first electrode is disposed between the liquid crystal layer and the first substrate. The initial alignment direction of the liquid crystal molecules substantially forms an angle of 45° or 135° with the short side direction of the first electrode. The length direction of the first opening of the first electrode forms an angle with the initial alignment direction of the liquid crystal molecules, and the angle is greater than or equal to 5° and less than or equal to 45°. The first substrate is disposed between the first electrode and the first optical element. The second substrate is disposed between the second optical element and the liquid crystal layer.

Description

Technical Field

[0001] The present invention relates to an optoelectronic device, and more particularly to a display device. Background Art

[0002] Due to the advantages of being thin, light, and low power consumption, liquid crystal displays have gradually replaced traditional cathode ray tubes in multimedia displays in the past two decades, and even surpassed the development of various display technologies, such as plasma displays, field emission displays, etc., and stood out in the market. Liquid crystal displays are widely used. Liquid crystal displays are not only used in consumer electronic products, but also used in vehicles. Taking in-vehicle applications as an example, liquid crystal displays are often mounted on the center console between the driver's seat and the front passenger seat. When the liquid crystal display is mounted on the center console, the driver and / or the front passenger often view the liquid crystal display at a special oblique angle. Therefore, it is particularly important to improve the contrast at a special angle. However, the development of compensation films is ultimately limited, and it is impossible to infinitely improve the contrast of liquid crystal displays at special angles using compensation films. Summary of the Invention

[0003] An object of the present invention is to provide a display device with excellent performance.

[0004] The display device according to an embodiment of the present invention includes a first substrate, a second substrate, a liquid crystal layer, a first electrode, a first optical element, and a second optical element. The second substrate is disposed opposite to the first substrate. The liquid crystal layer is disposed between the first substrate and the second substrate. When the display device is not enabled, a plurality of liquid crystal molecules in the liquid crystal layer have an initial alignment direction. The first electrode is disposed between the liquid crystal layer and the first substrate and has a first opening. The initial alignment direction of the liquid crystal molecules substantially forms an angle of 45° or 135° with the short side direction of the first electrode, and the length direction of the first opening of the first electrode forms an angle with the initial alignment direction of the liquid crystal molecules, and the angle is greater than or equal to 5° and less than or equal to 45°. The first substrate is disposed between the first electrode and the first optical element. Natural light has a first polarization direction after passing through the first optical element, and the first polarization direction substantially forms an angle of 45° with the short side direction of the first electrode. The second substrate is disposed between the second optical element and the liquid crystal layer. Natural light has a second polarization direction after passing through the second optical element, and the second polarization direction substantially forms an angle of 135° with the short side direction of the first electrode.

[0005] A display device according to an embodiment of the present invention includes a first substrate, a second substrate, a liquid crystal layer, a first electrode, a first optical element, and a second optical element. The second substrate is disposed opposite to the first substrate. The liquid crystal layer is disposed between the first substrate and the second substrate. When the display device is not enabled, a plurality of liquid crystal molecules in the liquid crystal layer have an initial alignment direction. The first electrode is disposed between the liquid crystal layer and the first substrate and has a first opening. The initial alignment direction of the liquid crystal molecules forms a first angle with the short side direction of the first electrode. The length direction of the first opening of the first electrode forms an angle with the initial alignment direction of the liquid crystal molecules, and the angle is greater than or equal to 5° and less than or equal to 45°. The first substrate is disposed between the first electrode and the first optical element. Natural light has a first polarization direction after passing through the first optical element, and the first polarization direction forms a second angle with the short side direction of the first electrode. The second substrate is disposed between the second optical element and the liquid crystal layer. Natural light has a second polarization direction after passing through the second optical element, and the second polarization direction substantially forms a third angle with the short side direction of the first electrode. The difference between one of the second angle and the third angle and the first angle falls within the range of 0° to 5°. BRIEF DESCRIPTION OF THE DRAWINGS

[0006] Figure 1 FIG. is a schematic cross-sectional view of a display device according to a first embodiment of the present invention.

[0007] Figure 2 is Figure 1 a top view schematic diagram of the first electrode of the display device of

[0008] Figure 3 shows Figure 1 the backlight, reflective polarizing brightness enhancement film, first polarizer, liquid crystal layer, compensation film, and second polarizer of the display device of

[0009] Figure 4 FIG. is a schematic cross-sectional view of a display device according to a first comparative example of the present invention.

[0010] Figure 5 is Figure 4 a top view schematic diagram of the first electrode of the display device of

[0011] Figure 6 shows Figure 4 the backlight, reflective polarizing brightness enhancement film, first polarizer, liquid crystal layer, compensation film, and second polarizer of the display device of

[0012] Figure 7 shows the viewing angle diagrams, relative liquid crystal efficiencies in the main viewing direction, and relative contrasts at azimuth angle 156.6° and tilt angle 42.4° of the display device of the first comparative example and the display device of the first embodiment.

[0013] Figure 8Schematic cross-sectional view of the display device according to the second embodiment of the present invention.

[0014] Figure 9 Shows Figure 8 the backlight, reflective polarizing brightness enhancement film, first polarizer, first quarter-wave plate, liquid crystal layer, compensation film, and second polarizer of the display device.

[0015] Figure 10 Schematic cross-sectional view of the display device according to the third embodiment of the present invention.

[0016] Figure 11 Shows Figure 10 the backlight, reflective polarizing brightness enhancement film, first polarizer, liquid crystal layer, compensation film, second quarter-wave plate, and second polarizer of the display device.

[0017] Figure 12 Schematic cross-sectional view of the display device according to the fourth embodiment of the present invention.

[0018] Figure 13 Shows Figure 12 the backlight, reflective polarizing brightness enhancement film, first polarizer, first quarter-wave plate, liquid crystal layer, compensation film, second quarter-wave plate, and second polarizer of the display device.

[0019] Figure 14 Top view schematic of the first electrode of the display device according to the fifth embodiment of the present invention.

[0020] Figure 15 Top view schematic of the first electrode of the display device according to the sixth embodiment of the present invention.

[0021] Figure 16 Top view schematic of the first electrode of the display device according to the second comparative example of the present invention.

[0022] Figure 17 Shows the viewing angle diagrams, relative liquid crystal efficiency in the main viewing direction, relative contrast at azimuth angle 156.6° and tilt angle 42.4°, and the degree of relative response time improvement of the display devices of the first embodiment, the fifth embodiment, the sixth embodiment, and the second comparative example.

[0023] Figure 18 Schematic cross-sectional view of the display device according to the seventh embodiment of the present invention.

[0024] Figure 19 Is Figure 18 top view schematic of the first electrode and the second electrode of the display device.

[0025] Figure 20 Is Figure 18 viewing angle diagram of the display device.

[0026] The reference numerals are as follows:

[0027] 10, 10A, 10B, 10C, 10D, 10E, 10F, 20, 20A: Display device

[0028] 110: First substrate

[0029] 120: Second substrate

[0030] 130: Liquid crystal layer

[0031] 140: Third electrode

[0032] 150, 180: Insulating layer

[0033] 160, 160D, 160E, 160’, 160’A: First electrode

[0034] 162: First branch

[0035] 162e: Endpoint

[0036] 162s: First opening

[0037] 164: Outer frame

[0038] 164s, 166s: Short side

[0039] 166: Virtual outer frame

[0040] 170: Fourth electrode

[0041] 190: Second electrode

[0042] 192: Second branch

[0043] 192s: Second opening

[0044] A DBEF : Polarization direction

[0045] A POL1 、A POL2 : Transmission axis

[0046] A LC : Initial alignment direction

[0047] A 162S : Length direction

[0048] A HWP1 、A HWP2 、A Re : Slow axis

[0049] BLU: Backlight

[0050] DBEF: Reflective Polarization Enhancement Film

[0051] HWP1: First Half-Wavelength Plate

[0052] HWP2: Second Half-Wavelength Plate

[0053] K: Virtual Reference Line

[0054] L: Light Beam

[0055] L p : First Part

[0056] L s : Second Part

[0057] LC: Liquid Crystal Molecules

[0058] OE1: First Optical Element

[0059] OE2: Second Optical Element

[0060] POL1: First Polarizer

[0061] POL2: Second Polarizer

[0062] Re: Compensation Film

[0063] x: Short Side Direction

[0064] α1, α2, β, γ, θ, η, δ1, δ2, φ: Angles

[0065] ρ: Included Angle Detailed Embodiments

[0066] Reference will now be made in detail to the exemplary embodiments of the present invention, examples of which are illustrated in the accompanying drawings. Wherever possible, the same reference numerals will be used in the drawings and the description to refer to the same or like parts.

[0067] It should be understood that when an element such as a layer, film, region, or substrate is referred to as being "on" or "connected to" another element, it can be directly on or connected to the other element, or intervening elements may also be present. In contrast, when an element is referred to as being "directly on" or "directly connected to" another element, no intervening elements are present. As used herein, "connected" may refer to physical and / or electrical connection. Furthermore, "electrically connected" or "coupled" may mean that other elements exist between two elements.

[0068] As used herein, "about", "approximate", or "substantially" includes the stated value and the average within an acceptable deviation range of the specific value determined by a person of ordinary skill in the art, taking into account the particular amount of the measurement being discussed and the errors associated with the measurement (i.e., the limitations of the measurement system). For example, "about" can mean within one or more standard deviations of the stated value, or within ±30%, ±20%, ±10%, or ±5%. Furthermore, "about", "approximate", or "substantially" as used herein can be selected according to optical properties, etching properties, or other properties to a more acceptable deviation range or standard deviation, rather than applying a single standard deviation to all properties.

[0069] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by a person of ordinary skill in the art to which this invention belongs. It will be further understood that terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with their meaning in the context of the relevant art and this invention, and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

[0070] Figure 1 It is a cross-sectional schematic diagram of the display device 10 according to the first embodiment of the present invention. Figure 2 is Figure 1 a top view schematic diagram of the first electrode 160 of the display device 10. Figure 3 shows Figure 1 the backlight BLU, the reflective polarizing brightness enhancement film DBEF, the first polarizer POL1, the liquid crystal layer 130, the compensation film Re, and the second polarizer POL2 of the display device 10.

[0071] Please refer to Figure 1 , the display device 10 includes a first substrate 110, a second substrate 120, and a liquid crystal layer 130. The second substrate 120 is disposed opposite to the first substrate 110. The liquid crystal layer 130 is disposed between the first substrate 110 and the second substrate 120. In this embodiment, the first substrate 110 and the second substrate 120 may be light-transmitting substrates. For example, in this embodiment, the materials of the first substrate 110 and the second substrate 120 may be glass, quartz, organic polymers, or other applicable materials.

[0072] Please refer to Figure 1 and Figure 2 , the display device 10 further includes a first electrode 160 disposed between the liquid crystal layer 130 and the first substrate 110. The first electrode 160 has a first opening 162s. Specifically, in this embodiment, the first electrode 160 may include a plurality of first branches 162, where the plurality of first branches 162 are spaced apart to define the first opening 162s.

[0073] The first electrode 160 has a short-side direction x. In this embodiment, the first electrode 160 may selectively include an outer frame 164 disposed around a plurality of first branches 162 and connecting a plurality of end points 162e of the plurality of first branches 162. In this embodiment, the short-side direction x of the first electrode 160 may refer to the extending direction of the short side 164s of the outer frame 164. However, the present invention is not limited thereto. In other embodiments, the first electrode 160 may not include the outer frame 164, and a virtual outer frame 166 surrounds the plurality of first branches 162 of the first electrode 160 and passes through the plurality of end points 162e of the plurality of first branches 162, and the short-side direction x of the first electrode 160 may refer to the extending direction of the short side 166s of the virtual outer frame 166.

[0074] In this embodiment, the first electrode 160 may be a transparent conductive electrode. For example, in this embodiment, the material of the first electrode 160 may include metal oxides, such as indium tin oxide, indium zinc oxide, aluminum tin oxide, aluminum zinc oxide, indium germanium zinc oxide, other suitable oxides, or a combination of at least two of the above, but the present invention is not limited thereto.

[0075] Please refer to Figure 1 , in this embodiment, the display device 10 further includes a third electrode 140 and an insulating layer 150, wherein the first electrode 160 is disposed between the liquid crystal layer 130 and the insulating layer 150, the insulating layer 150 is disposed between the first electrode 160 and the third electrode 140, the third electrode 140 is disposed between the insulating layer 150 and the first substrate 110, and the third electrode 140 overlaps the first opening 162s of the first electrode 160. The electric field between the first electrode 160 and the third electrode 140 is used to drive the liquid crystal molecules LC of the liquid crystal layer 130.

[0076] In this embodiment, the third electrode 140 may be a transparent conductive electrode. For example, in this embodiment, the material of the third electrode 140 may include metal oxides, such as indium tin oxide, indium zinc oxide, aluminum tin oxide, aluminum zinc oxide, indium germanium zinc oxide, other suitable oxides, or a combination of at least two of the above, but the present invention is not limited thereto.

[0077] Please refer to Figure 1 , the display device 10 further includes a first optical element OE1, wherein the first substrate 110 is disposed between the first electrode 160 and the first optical element OE1. Please refer to Figure 1 , Figure 2 and Figure 3, a natural light (not shown) has a first polarization direction after passing through the first optical element OE1, and the first polarization direction forms a substantially 45° angle with the short side direction x of the first electrode 160. For example, in the present embodiment, the first optical element OE1 may be a first polarizer POL1, and the transmission axis A of the first polarizer POL1 POL1 forms a substantially α1 angle with the short side direction x of the first electrode 160, and the angle α1 is substantially equal to 45°. After the natural light passes through the first polarizer POL1, a first linearly polarized light is formed, and the polarization direction of the first linearly polarized light forms a substantially 45° angle with the short side direction x of the first electrode 160. However, the present invention is not limited thereto. In other embodiments, the first optical element OE1 may also be other types of optical elements.

[0078] Please refer to Figure 1 , the display device 10 further includes a second optical element OE2, wherein the second substrate 120 is disposed between the second optical element OE2 and the liquid crystal layer 130. Please refer to Figure 1 , Figure 2 and Figure 3 , a natural light (not shown) has a second polarization direction after passing through the second optical element OE2, and the second polarization direction forms a substantially 135° angle with the short side direction x of the first electrode 160. For example, in the present embodiment, the second optical element OE2 may be a second polarizer POL2, and the transmission axis A of the second polarizer POL2 POL2 forms a substantially α2 angle with the short side direction x of the first electrode 160, and the angle α2 is substantially equal to 135°. After the natural light passes through the second polarizer POL2, a second linearly polarized light is formed, and the polarization direction of the second linearly polarized light forms a substantially 135° angle with the short side direction x of the first electrode 160. However, the present invention is not limited thereto. In other embodiments, the second optical element OE2 may also be other types of optical elements.

[0079] Please refer to Figure 1 and Figure 3 , in the present embodiment, the display device 10 may further selectively include a compensation film Re, which is disposed between the second optical element OE2 and the liquid crystal layer 130. For example, in the present embodiment, the compensation film Re may be a combination of a positive C-plate phase compensation film and a positive A-plate phase compensation film, a combination of a positive biaxial plate and a positive C-plate phase compensation film, or a combination of a positive biaxial plate and a negative biaxial plate phase compensation film, but the present invention is not limited thereto.

[0080] Please refer to Figure 1 and Figure 3The display device 10 further includes a backlight source BLU for emitting a light beam L, wherein the first optical element OE1 is disposed between the first substrate 110 and the backlight source BLU. In this embodiment, the backlight source BLU may be a direct-type backlight module or an edge-type backlight module, which is not limited by the present invention.

[0081] Please refer to Figure 1 and Figure 3 In this embodiment, the display device 10 may further selectively include a reflective polarized light enhancement film (Dual Brightness Enhancement Film) DBEF, which is disposed between the first optical element OE1 and the backlight source BLU. The light beam L emitted by the backlight source BLU includes a first portion L p (e.g., the P wave component of the light beam L) and the second part L s (e.g., the S wave component of the light beam L), the first part L of the light beam L p The second part L of the light beam L passes through the reflective polarizing film DBEF. s The light is reflected by the reflective polarized light enhancement film DBEF back to the backlight source BLU for reuse.

[0082] Please refer to Figure 1 and Figure 3 In this embodiment, the first part L of the light beam L p The polarization direction A DBEF The first polarizer POL1 has an angle γ with the short side direction x of the first electrode 160, and the angle γ is substantially equal to 45°. POL1 The first electrode 160 substantially forms an angle α1 with the short side direction x, and the angle α1 is substantially equal to 45°. When the display device 10 is not enabled, the liquid crystal molecules LC of the liquid crystal layer 130 have an initial alignment direction (or rubbing direction or photo-alignment direction) A LC When the display device 10 is not enabled, the long axis direction (or slow axis direction) of the liquid crystal molecules LC and the initial alignment direction A of the liquid crystal molecules LC are LC In this embodiment, the initial alignment direction A of the liquid crystal molecules LC LC An angle θ is formed with the short side direction x of the first electrode 160, and the angle θ is substantially equal to 45° or 135°. In other words, θ=45°±1°, or θ=135°±1°. For example, in this embodiment, the angle θ is substantially equal to 135°, but the invention is not limited thereto.

[0083] The initial alignment direction A of the liquid crystal molecules LC LCThe first angle (i.e., angle θ) is formed with respect to the short side direction x of the first electrode 160. Natural light (not shown) has a first polarization direction after passing through the first optical element OE1, and the first polarization direction substantially forms a second angle (e.g., but not limited to, Figure 3 angle α1) with the short side direction x of the first electrode 160. Natural light (not shown) has a second polarization direction after passing through the second optical element OE2, and the second polarization direction substantially forms a second angle (e.g., but not limited to, Figure 3 angle α2) with the short side direction x of the first electrode 160. One of the first angle, the second angle, and the third angle is substantially the same. That is, the difference between one of the first angle, the second angle, and the third angle falls within the range of 0° to 5°.

[0084] Please refer to Figure 2 and Figure 3 , the length direction A of the first opening 162s of the first electrode 160 162S forms an angle η with the initial alignment direction A of the liquid crystal molecules LC LC , and the angle η is greater than or equal to 5° and less than or equal to 45°. For example, in this embodiment, 5° ≤ η ≤ 10°, but the present invention is not limited thereto.

[0085] Please refer to Figure 1 and Figure 3 , in this embodiment, the slow axis A of the compensation film Re Re forms an angle β with the short side direction x of the first electrode 160, and the angle β is substantially equal to 135°. In this embodiment, the transmission axis A of the second polarizer POL2 POL2 substantially forms an angle α2 with the short side direction x of the first electrode 160, and the angle α2 is substantially equal to 135°.

[0086] It should be noted that the contrast of the display device 10 is significantly improved at azimuth angles of 23.4° and tilt angles of 42.4°, at azimuth angles of 156.6° and tilt angles of 42.4°, at azimuth angles of 191.9° and tilt angles of 40.6°, and at azimuth angles of 348.1° and tilt angles of 40.6°. That is, the viewing angles of the display device 10 at azimuth angles of 23.4°, 156.6°, 191.9°, and 348.1° are significantly increased, and it can meet the requirements of special applications (e.g., display on the car center console). The following will be described in conjunction with Figures 4 to 7 an example.

[0087] Figure 4 is a cross-sectional schematic diagram of the display device 20 of the first comparative example of the present invention. Figure 5 is Figure 4 a top view schematic diagram of the first electrode 160' of the display device 20. Figure 6 shows Figure 4The backlight BLU, reflective polarizing brightness enhancement film DBEF, first polarizer POL1, liquid crystal layer 130, compensation film Re, and second polarizer POL2 of the display device 20.

[0088] Please refer to Figure 4 , Figure 5 and Figure 6 , the display device 20 of the first comparative example is similar to the display device 10 of the first embodiment, and the difference between the two is that: the first part L of the light beam L of the two p polarization direction A DBEF the angle between the short side direction x of the first electrode 160, the transmission axis A of the first polarizer POL1 POL1 the angle between the short side direction x of the first electrode 160, the initial alignment direction A of the liquid crystal molecules LC LC the angle θ between the short side direction x of the first electrode 160, the slow axis A of the compensation film Re Re the angle β between the short side direction x of the first electrode 160, and the transmission axis A of the second polarizer POL2 POL2 the angle α2 between the short side direction x of the first electrode 160 is different.

[0089] Please refer to Figure 4 , Figure 5 and Figure 6 , specifically, in this embodiment, the first part L of the light beam L p polarization direction A DBEF the angle between the short side direction x of the first electrode 160 is substantially equal to 0°, the transmission axis A of the first polarizer POL1 POL1 the angle between the short side direction x of the first electrode 160 is substantially equal to 0°, the initial alignment direction A of the liquid crystal molecules LC LC the angle θ between the short side direction x of the first electrode 160 is substantially equal to 90°, the slow axis A of the compensation film Re Re the angle β between the short side direction x of the first electrode 160 is substantially equal to 90°, and the transmission axis A of the second polarizer POL2 POL2 the angle α2 between the short side direction x of the first electrode 160 is substantially equal to 90°.

[0090] Figure 7 Shows the viewing angle diagrams of the display device 20 of the first comparative example and the display device 10 of the first embodiment, the relative liquid crystal efficiency in the main viewing direction, and the relative contrast at azimuth 156.6° and tilt angle 42.4°.

[0091] By Figure 7The data shows that, compared with the display device 20 of the first comparative example, the display device 10 of the first embodiment has a significantly large improvement in relative contrast at azimuth angles of 23.4° and tilt angles of 42.4°, at azimuth angles of 156.6° and tilt angles of 42.4°, at azimuth angles of 191.9° and tilt angles of 40.6°, and at azimuth angles of 348.1° and tilt angles of 40.6°; in addition, the relative liquid crystal efficiency of the display device 10 of the first embodiment is also slightly improved in the main viewing direction.

[0092] It must be noted here that the following embodiments follow the component numbers and some content of the foregoing embodiments, where the same numbers are used to represent the same or similar components, and the description of the same technical content is omitted. For the description of the omitted parts, reference can be made to the foregoing embodiments, and the following embodiments will not be repeated.

[0093] Figure 8 It is a cross-sectional schematic diagram of the display device 10A according to the second embodiment of the present invention. Figure 9 Shows Figure 8 The backlight BLU, the reflective polarizing brightness enhancement film DBEF, the first polarizer POL1, the first half-wave plate HWP1, the liquid crystal layer 130, the compensation film Re, and the second polarizer POL2 of the display device 10A.

[0094] Please refer to Figure 8 And Figure 9 , the display device 10A of the second embodiment is similar to the display device 10 of the first embodiment, and the difference between the two is that: the first part L of the light beam L of the two p The polarization direction A DBEF The angle between the short side direction x of the first electrode 160 is different, and the transmission axis A of the first polarizer POL1 of the two POL1 The angle between the short side direction x of the first electrode 160 is different, and the first optical element OE1 of the two is different.

[0095] Specifically, in this embodiment, the first optical element OE1 includes, in addition to the first polarizer POL1, the first half-wave plate HWP1, where the first half-wave plate HWP1 is disposed between the liquid crystal layer 130 and the first polarizer POL1. In this embodiment, the reflective polarizing brightness enhancement film DBEF, the first polarizer POL1, the first half-wave plate HWP1, the liquid crystal layer 130, the compensation film Re, and the second polarizer POL2 are sequentially disposed on the backlight BLU.

[0096] In this embodiment, the first part L of the light beam L p The polarization direction A DBEF The angle between the short side direction x of the first electrode 160 is substantially 0°, and the transmission axis A of the first polarizer POL1 POL1The angle formed with the short side direction x of the first electrode 160 is substantially 0°, and the slow axis A of the first half-wave plate HWP1 HWP1 The angle δ1 formed with the short side direction x of the first electrode 160 is substantially equal to 22.5°, and the initial alignment direction A of the liquid crystal molecules LC LC The angle θ formed with the short side direction x of the first electrode 160 is substantially equal to 135°, and the slow axis A of the compensation film Re Re The angle β formed with the short side direction x of the first electrode 160 is substantially equal to 135°, and the transmission axis A of the second polarizer POL2 POL2 The angle α2 formed with the short side direction x of the first electrode 160 is substantially equal to 135°.

[0097] The display device 10A of the second embodiment can also significantly improve the contrast at azimuth angles of 23.4° and tilt angles of 42.4°, at azimuth angles of 156.6° and tilt angles of 42.4°, at azimuth angles of 191.9° and tilt angles of 40.6°, and at azimuth angles of 348.1° and tilt angles of 40.6°.

[0098] Figure 10 It is a cross-sectional schematic diagram of the display device 10B according to the third embodiment of the present invention. Figure 11 Shows Figure 10 The backlight BLU, the reflective polarizing brightness enhancement film DBEF, the first polarizer POL1, the liquid crystal layer 130, the compensation film Re, the second half-wave plate HWP2, and the second polarizer POL2 of the display device 10B.

[0099] Please refer to Figure 10 And Figure 11 , the display device 10B of the third embodiment is similar to the display device 10 of the first embodiment, and the difference between the two is that the second optical element OE2 of the two is different.

[0100] Specifically, in this embodiment, the second optical element OE2 includes a second half-wave plate HWP2 in addition to the second polarizer POL2, and the second half-wave plate HWP2 is disposed between the second polarizer POL2 and the liquid crystal layer 130. In this embodiment, the reflective polarizing brightness enhancement film DBEF, the first polarizer POL1, the liquid crystal layer 130, the compensation film Re, the second half-wave plate HWP2, and the second polarizer POL2 are sequentially disposed on the backlight BLU.

[0101] In this embodiment, the first part L of the light beam L p The polarization direction A DBEF The angle γ formed with the short side direction x of the first electrode 160 is substantially 45°, and the transmission axis A of the first polarizer POL1 POL1The angle α1 formed with the short side direction x of the first electrode 160 is substantially 45°, and the initial alignment direction A of the liquid crystal molecules LC LC The angle θ formed with the short side direction x of the first electrode 160 is substantially equal to 135°, and the slow axis A of the compensation film Re Re The angle β formed with the short side direction x of the first electrode 160 is substantially equal to 135°, and the slow axis A of the second half-wave plate HWP2 HWP2 The angle δ2 formed with the short side direction x of the first electrode 160 is substantially equal to 22.5°, and the transmission axis A of the second polarizer POL2 POL2 The angle α2 formed with the short side direction x of the first electrode 160 is substantially equal to 90°.

[0102] The display device 10B of the third embodiment can also significantly improve the contrast at azimuth angles of 23.4° and tilt angles of 42.4°, at azimuth angles of 156.6° and tilt angles of 42.4°, at azimuth angles of 191.9° and tilt angles of 40.6°, and at azimuth angles of 348.1° and tilt angles of 40.6°.

[0103] Figure 12 It is a cross-sectional schematic diagram of the display device 10C according to the fourth embodiment of the present invention. Figure 13 Shows Figure 12 The backlight BLU, the reflective polarizing brightness enhancement film DBEF, the first polarizer POL1, the first half-wave plate HWP1, the liquid crystal layer 130, the compensation film Re, the second half-wave plate HWP2, and the second polarizer POL2 of the display device 10C.

[0104] Please refer to Figure 12 And Figure 13 , The display device 10C of the fourth embodiment is similar to the display device 10 of the first embodiment, and the difference between the two is that the first optical element OE1 and the second optical element OE2 of the two are different.

[0105] Specifically, in this embodiment, the first optical element OE1 includes, in addition to the first polarizer POL1, a first half-wave plate HWP1, where the first half-wave plate HWP1 is disposed between the liquid crystal layer 130 and the first polarizer POL1; the second optical element OE2 includes, in addition to the second polarizer POL2, a second half-wave plate HWP2, where the second half-wave plate HWP2 is disposed between the second polarizer POL2 and the liquid crystal layer 130. In this embodiment, the reflective polarizing brightness enhancement film DBEF, the first polarizer POL1, the first half-wave plate HWP1, the liquid crystal layer 130, the compensation film Re, the second half-wave plate HWP2, and the second polarizer POL2 are sequentially disposed on the backlight BLU.

[0106] In this embodiment, the first part L of the light beam L p has a polarization direction A DBEF that forms an angle of substantially 0° with the short side direction x of the first electrode 160. The transmission axis A of the first polarizer POL1 POL1 forms an angle of substantially 0° with the short side direction x of the first electrode 160. The slow axis A of the first half-wave plate HWP1 HWP1 forms an angle δ1 that is substantially equal to 22.5° with the short side direction x of the first electrode 160. The initial alignment direction A of the liquid crystal molecules LC LC forms an angle θ that is substantially equal to 135° with the short side direction x of the first electrode 160. The slow axis A of the compensation film Re Re forms an angle β that is substantially equal to 135° with the short side direction x of the first electrode 160. The slow axis A of the second half-wave plate HWP2 HWP2 forms an angle δ2 that is substantially equal to 22.5° with the short side direction x of the first electrode 160, and the transmission axis A of the second polarizer POL2 POL2 forms an angle α2 that is substantially equal to 90° with the short side direction x of the first electrode 160.

[0107] The display device 10C of the fourth embodiment can also significantly improve the contrast at azimuth angles of 23.4° and tilt angles of 42.4°, at azimuth angles of 156.6° and tilt angles of 42.4°, at azimuth angles of 191.9° and tilt angles of 40.6°, and at azimuth angles of 348.1° and tilt angles of 40.6°.

[0108] Figure 14 is a top view schematic diagram of the first electrode 160D of the display device 10D according to the fifth embodiment of the present invention. The display device 10D of the fifth embodiment is similar to the display device 10 of the first embodiment, and the difference between the two is that their first electrodes 160 and 160D are different. Please refer to Figure 14 , specifically, in this embodiment, the shape of the first opening 162s of the first electrode 160D can be generally in the shape of a honeycomb. The first electrode 160D having the honeycomb-shaped first opening 162s can be used to replace the first electrode 160 having the slit-shaped first opening 162s of the first embodiment, thereby forming the display device 10D of the fifth embodiment.

[0109] Figure 15 is a top view schematic diagram of the first electrode 160E of the display device 10E according to the sixth embodiment of the present invention. The display device 10E of the sixth embodiment is similar to the display device 10D of the fifth embodiment, and the difference between the two is that their first electrodes 160D and 160E are different. Please refer to Figure 15 , specifically, in this embodiment, the honeycomb-shaped first openings 162s arranged in the same direction can communicate with each other.Figure 15 The first electrode 160E can be used to replace the first electrode 160 of the first embodiment to form the display device 10E of the sixth embodiment.

[0110] Figure 16 FIG. is a top view schematic diagram of the first electrode 160’A of the display device 20A of the second comparative example of the present invention. The display device 20A of the second comparative example is similar to the display device 20 of the first comparative example. The difference between the two is that the first electrodes 160A and 160’A of the two are different. Please refer to Figure 16 , specifically, in this embodiment, the shape of the first opening 162s of the first electrode 160’A can be generally in the shape of a honeycomb. The first electrode 160’A having the honeycomb-shaped first opening 162s can be used to replace the first electrode 160A having the slit-shaped first opening 162s of the first comparative example to form the display device 20A of the second comparative example.

[0111] Figure 17 FIG. shows the perspective view, the relative liquid crystal efficiency in the main viewing direction, the relative contrast at the azimuth angle of 156.6° and the tilt angle of 42.4°, and the degree of improvement in the relative response time of the display device 10 of the first embodiment, the display device 10D of the fifth embodiment, the display device 10E of the sixth embodiment, and the display device 20A of the second comparative example.

[0112] From Figure 17 the data can be proved that compared with the display device 20A of the second comparative example, the display devices 10D of the fifth embodiment and 10E of the sixth embodiment have significantly improved relative contrast at the azimuth angle of 23.4° and the tilt angle of 42.4°, at the azimuth angle of 156.6° and the tilt angle of 42.4°, at the azimuth angle of 191.9° and the tilt angle of 40.6°, and at the azimuth angle of 348.1° and the tilt angle of 40.6°; in addition, the response time is also improved.

[0113] Figure 18 FIG. is a cross-sectional schematic diagram of the display device 10F of the seventh embodiment of the present invention. Figure 19 is Figure 18 a top view schematic diagram of the first electrode 160 and the second electrode 190 of the display device 10F. Figure 20 is Figure 18 a perspective view of the display device 10F.

[0114] Please refer to Figure 18 and Figure 19 , the display device 10F of the seventh embodiment is similar to the display device 10 of the first embodiment. The difference between the two is that the display device 10F of the seventh embodiment further includes a second electrode 190, an insulating layer 180, and a fourth electrode 170.

[0115] Please refer toFigure 18 and Figure 19 In this embodiment, the display device 10F further includes a second electrode 190, an insulating layer 180, and a fourth electrode 170. The second electrode 190 is disposed between the second substrate 120 and the liquid crystal layer 130 and has a second opening 192s. The insulating layer 180 is disposed between the second electrode 190 and the fourth electrode 170. The fourth electrode 170 is disposed between the insulating layer 180 and the second substrate 120, and the fourth electrode 170 overlaps the second opening 192s of the second electrode 190. The electric field between the second electrode 190 and the fourth electrode 170 is used to drive the liquid crystal molecules LC of the liquid crystal layer 130.

[0116] The first electrode 160 has a first branch 162 that defines a first opening 162s. The second electrode 190 has a second branch 192 that defines a second opening 192s. In this embodiment, the virtual reference line K substantially forms an angle angle substantially equal to 135° with the short side direction x of the first electrode 160, and the first branch 162 and the second branch 192 can be mirror-symmetric with respect to the virtual reference line K. In this embodiment, the first branch 162 of the first electrode 160 and the second branch 192 of the second electrode 190 have an included angle ρ, and the included angle ρ can fall within the range of 10° to 60°. Considering the improvement degree of the response time, preferably, the included angle ρ can fall within the range of 14° to 30°.

[0117] Table 1 below shows the relative liquid crystal efficiency in the main viewing direction of the display device 10 of the first embodiment, the relative contrast at the azimuth angle of 156.6° and the tilt angle of 42.4°, and the relative reduced response time. Table 1 below also shows the relative liquid crystal efficiency in the main viewing direction of the display device 10F of the seventh embodiment and the relative contrast and the degree of improvement of the relative response time at the azimuth angle of 156.6° and the tilt angle of 42.4° when the included angle ρ is equal to 10°, 14°, 30°, and 60°, respectively.

[0118]

[0119] [Table 1]

[0120] Please refer to Figure 18 , Figure 19 and Figure 20 , the display device 10F of this embodiment also has a high contrast at the azimuth angle of 23.4° and the tilt angle of 42.4°, at the azimuth angle of 156.6° and the tilt angle of 42.4°, at the azimuth angle of 191.9° and the tilt angle of 40.6°, and at the azimuth angle of 348.1° and the tilt angle of 40.6°; in addition, the response time is also improved.

Claims

1. A display device, comprising: a first substrate; a second substrate disposed opposite to the first substrate; a liquid crystal layer disposed between the first substrate and the second substrate, wherein when the display device is not enabled, a plurality of liquid crystal molecules in the liquid crystal layer have an initial alignment direction; a first electrode disposed between the liquid crystal layer and the first substrate and having a first opening, wherein the initial alignment direction of the plurality of liquid crystal molecules substantially forms an angle of 45° or 135° with a short side direction of the first electrode, and a length direction of the first opening of the first electrode forms an angle with the initial alignment direction of the plurality of liquid crystal molecules, and the angle is greater than or equal to 5° and less than or equal to 45°; a first optical element, wherein the first substrate is disposed between the first electrode and the first optical element, a natural light has a first polarization direction after passing through the first optical element, and the first polarization direction substantially forms an angle of 45° with the short side direction of the first electrode; and a second optical element, wherein the second substrate is disposed between the second optical element and the liquid crystal layer, a natural light has a second polarization direction after passing through the second optical element, and the second polarization direction substantially forms an angle of 135° with the short side direction of the first electrode; a second electrode disposed between the second substrate and the liquid crystal layer and having a second opening; the first electrode has a first branch defining the first opening, and the second electrode has a second branch defining the second opening; the first branch of the first electrode and the second branch of the second electrode have an included angle ρ, and the included angle ρ falls within the range of 10° to 60°.

2. The display device according to claim 1, wherein the first optical element includes a first polarizer, and a transmission axis of the first polarizer substantially forms an angle of 45° with the short side direction of the first electrode; the second optical element includes a second polarizer, and a transmission axis of the second polarizer substantially forms an angle of 135° with the short side direction of the first electrode.

3. The display device according to claim 2, further comprising: a compensation film disposed between the second optical element and the liquid crystal layer, wherein a slow axis of the compensation film substantially forms an angle of 135° with the short side direction of the first electrode.

4. The display device according to claim 3, further comprising: a backlight for emitting a light beam, wherein the first optical element is disposed between the first substrate and the backlight; and a reflective polarizing brightness enhancement film disposed between the first optical element and the backlight, wherein a first part of the light beam passes through the reflective polarizing brightness enhancement film, a second part of the light beam is reflected by the reflective polarizing brightness enhancement film, and a polarization direction of the first part of the light beam substantially forms an angle of 45° with the short side direction of the first electrode.

5. The display device according to claim 1, wherein the first optical element includes a first polarizer and a first half-wave plate, the first half-wave plate is disposed between the liquid crystal layer and the first polarizer, a transmission axis of the first polarizer substantially forms an angle of 0° with the short side direction of the first electrode, and a slow axis of the first half-wave plate substantially forms an angle of 22.5° with the short side direction of the first electrode; the second optical element includes a second polarizer, and a transmission axis of the second polarizer substantially forms an angle of 135° with the short side direction of the first electrode.

6. The display device according to claim 5, further comprising: a compensation film disposed between the second optical element and the liquid crystal layer, wherein a slow axis of the compensation film substantially forms an angle of 135° with the short side direction of the first electrode.

7. The display device according to claim 6, further comprising: a backlight for emitting a light beam, wherein the first optical element is disposed between the first substrate and the backlight; and a reflective polarizing brightness enhancement film disposed between the first optical element and the backlight, wherein a first part of the light beam passes through the reflective polarizing brightness enhancement film, a second part of the light beam is reflected by the reflective polarizing brightness enhancement film, and a polarization direction of the first part of the light beam substantially forms an angle of 0° with the short side direction of the first electrode.

8. The display device according to claim 1, wherein the first optical element includes a first polarizer, and a transmission axis of the first polarizer substantially forms an angle of 45° with the short side direction of the first electrode; the second optical element includes a second polarizer and a second half-wave plate, the second half-wave plate is disposed between the second polarizer and the liquid crystal layer, a transmission axis of the second polarizer substantially forms an angle of 90° with the short side direction of the first electrode, and a slow axis of the second half-wave plate substantially forms an angle of 22.5° with the short side direction of the first electrode.

9. The display device according to claim 8, further comprising: a compensation film disposed between the second optical element and the liquid crystal layer, wherein a slow axis of the compensation film substantially forms an angle of 135° with the short side direction of the first electrode.

10. The display device according to claim 9, further comprising: a backlight for emitting a light beam, wherein the first optical element is disposed between the first substrate and the backlight; and a reflective polarizing brightness enhancement film disposed between the first optical element and the backlight, wherein a first part of the light beam passes through the reflective polarizing brightness enhancement film, a second part of the light beam is reflected by the reflective polarizing brightness enhancement film, and a polarization direction of the first part of the light beam substantially forms an angle of 45° with the short side direction of the first electrode.

11. The display device according to claim 1, wherein the first optical element includes a first polarizer and a first half-wave plate. The first half-wave plate is disposed between the first polarizer and the liquid crystal layer. A transmission axis of the first polarizer substantially forms an angle of 90° with the short side direction of the first electrode, and a slow axis of the first half-wave plate substantially forms an angle of 22.5° with the short side direction of the first electrode; the second optical element includes a second polarizer and a second half-wave plate. The second half-wave plate is disposed between the second polarizer and the liquid crystal layer. A transmission axis of the second polarizer substantially forms an angle of 0° with the short side direction of the first electrode, and a slow axis of the second half-wave plate substantially forms an angle of 22.5° with the short side direction of the first electrode.

12. The display device according to claim 11, further comprising: a compensation film disposed between the second optical element and the liquid crystal layer, wherein a slow axis of the compensation film substantially forms an angle of 135° with the short side direction of the first electrode.

13. The display device according to claim 12, further comprising: a backlight for emitting a light beam, wherein the first optical element is disposed between the first substrate and the backlight; and a reflective polarizing brightness enhancement film disposed between the first optical element and the backlight, wherein a first part of the light beam passes through the reflective polarizing brightness enhancement film, a second part of the light beam is reflected by the reflective polarizing brightness enhancement film, and a polarization direction of the first part of the light beam substantially forms an angle of 0° with the short side direction of the first electrode.

14. The display device according to claim 1, wherein a virtual reference line substantially forms an angle of 45° with the short side direction of the first electrode, and the first branch and the second branch are mirror-symmetric with respect to the virtual reference line.

15. A display device, comprising: a first substrate; a second substrate disposed opposite to the first substrate; a liquid crystal layer disposed between the first substrate and the second substrate, wherein when the display device is not enabled, a plurality of liquid crystal molecules in the liquid crystal layer have an initial alignment direction; a first electrode disposed between the liquid crystal layer and the first substrate and having a first opening, wherein the initial alignment direction of the plurality of liquid crystal molecules forms a first angle with a short side direction of the first electrode, and a length direction of the first opening of the first electrode forms an angle with the initial alignment direction of the plurality of liquid crystal molecules, and the angle is greater than or equal to 5° and less than or equal to 45°; a first optical element, wherein the first substrate is disposed between the first electrode and the first optical element, and a natural light has a first polarization direction after passing through the first optical element, and the first polarization direction forms a second angle with the short side direction of the first electrode; and a second optical element, wherein the second substrate is disposed between the second optical element and the liquid crystal layer, and a natural light has a second polarization direction after passing through the second optical element, and the second polarization direction substantially forms a third angle with the short side direction of the first electrode. The difference between one of the second angle and the third angle and the first angle falls within the range of 0° to 5°. A second electrode is disposed between the second substrate and the liquid crystal layer and has a second opening. The first electrode has a first branch defining the first opening, and the second electrode has a second branch defining the second opening; the first branch of the first electrode and the second branch of the second electrode have an included angle ρ, and the included angle ρ falls within the range of 10° to 60°.

16. The display device according to claim 15, wherein the first optical element includes a first polarizer, and a transmission axis of the first polarizer forms an angle of substantially 45° with the short side direction of the first electrode; the second optical element includes a second polarizer, and a transmission axis of the second polarizer forms an angle of substantially 135° with the short side direction of the first electrode.

17. The display device according to claim 15, wherein the first optical element includes a first polarizer and a first half-wave plate, the first half-wave plate is disposed between the liquid crystal layer and the first polarizer, a transmission axis of the first polarizer forms an angle of substantially 0° with the short side direction of the first electrode, and a slow axis of the first half-wave plate forms an angle of substantially 22.5° with the short side direction of the first electrode; the second optical element includes a second polarizer, and a transmission axis of the second polarizer forms an angle of substantially 135° with the short side direction of the first electrode.

18. The display device according to claim 15, wherein the first optical element includes a first polarizer, and a transmission axis of the first polarizer forms an angle of substantially 45° with the short side direction of the first electrode; the second optical element includes a second polarizer and a second half-wave plate, the second half-wave plate is disposed between the second polarizer and the liquid crystal layer, a transmission axis of the second polarizer forms an angle of substantially 90° with the short side direction of the first electrode, and a slow axis of the second half-wave plate forms an angle of substantially 22.5° with the short side direction of the first electrode.

19. The display device according to claim 15, wherein the first optical element includes a first polarizer and a first half-wave plate, the first half-wave plate is disposed between the first polarizer and the liquid crystal layer, a transmission axis of the first polarizer forms an angle of substantially 90° with the short side direction of the first electrode, and a slow axis of the first half-wave plate forms an angle of substantially 22.5° with the short side direction of the first electrode; the second optical element includes a second polarizer and a second half-wave plate, the second half-wave plate is disposed between the second polarizer and the liquid crystal layer, a transmission axis of the second polarizer forms an angle of substantially 0° with the short side direction of the first electrode, and a slow axis of the second half-wave plate forms an angle of substantially 22.5° with the short side direction of the first electrode.

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