Desktop projection type display

Abstract

The invention provides a desktop projection type display, which is characterized in that a plurality of sounders are fixed on one side, far away from a QWP quarter-wave plate, of a spectroscope, and a first substrate layer is fixed at the bottom of each sounder; the sounder comprises a first electrode layer, a piezoelectric layer arranged below the first electrode layer and an insulating layer arranged below the piezoelectric layer, a cylindrical opening is formed in the bottom of the insulating layer, a second electrode layer is arranged in the cylindrical opening, and the insulating layer is flush with the bottom of the second electrode layer; a bearing layer, a connecting layer and a second substrate layer are sequentially arranged below the second electrode layer and the insulating layer, a vibration cavity is formed in the second substrate layer in a penetrating mode, the vibration cavity is cylindrical, the vibration cavity corresponds to the second electrode layer, the overall size of the device can be reduced, and the sound production effect is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of display devices, and in particular relates to a desktop telescopic display. Background Art

[0002] For existing telescopic displays, Figure 1 As shown, it is usually composed of a display 1, a convex lens 2, a reflector with a free-form surface 3 and a window glass, and the window glass is composed of a beam splitter 4, a QWP quarter-wave plate 5, a POL polarizer 6, and an AR anti-reflection film 7. Figure 1 It can be seen that the optical path of the existing telescopic display is: the outgoing light of the display 1 is emitted through the convex lens 2, is reflected by the beam splitter 4 to the reflector 3 for the first time, and is reflected by the reflector 3, so that the outgoing light successively penetrates the beam splitter 4, the QWP quarter-wave plate 5, the POL polarizer 6, and the AR anti-reflection film 7 until it reaches the human eye.

[0003] For a complete long-projection display, it is usually necessary to add corresponding sound-emitting parts, such as speakers, on the side or front shell of the display, but it generally does not have a directional sound-emitting function, and it is necessary to add a separate sound-emitting part on the outer shell, which results in a larger overall size of the entire device and is not convenient for daily use. Summary of the invention

[0004] In order to solve the above technical problems, the present invention provides a desktop telescopic display to solve the problems raised in the above background technology.

[0005] In a first aspect, an embodiment of the present invention provides the following technical solution: a desktop telescopic display, comprising a display, a convex lens, a reflector and a beam splitter, a QWP quarter wave plate, a POL polarizer, and an AR anti-reflection film, arranged below the display, wherein the convex lens, the beam splitter, and the reflector are arranged correspondingly in sequence, so that the outgoing light of the display passes through the convex lens and is reflected to the reflector by the beam splitter, and the outgoing light is reflected by the reflector and sequentially penetrates the beam splitter, the QWP quarter wave plate, the POL polarizer, and the AR anti-reflection film until it reaches the human eye; A plurality of sound generators distributed in a rectangular array and arranged in a cylindrical shape are fixed on one side of the beam splitter away from the QWP quarter wave plate, and a first substrate layer is fixed on the bottom of the sound generator; The sound generator includes a first electrode layer, a piezoelectric layer arranged below the first electrode layer, and an insulating layer arranged below the piezoelectric layer. A cylindrical opening is opened at the bottom of the insulating layer, and a second electrode layer is arranged in the cylindrical opening. The insulating layer and the bottom of the second electrode layer are arranged flush, and a bearing layer, a connecting layer and a second base layer are arranged in sequence below the second electrode layer and the insulating layer. A vibration cavity is arranged through the second base layer, and the vibration cavity is arranged in a cylindrical shape. The vibration cavity is arranged corresponding to the second electrode layer, and the projection of the second electrode layer on the first base layer coincides with the projection of the vibration cavity on the first base layer.

[0006] Compared with the prior art, the beneficial effects of the present application are as follows: the present invention sets a sound generator, applies an excitation voltage to the piezoelectric layer, causes the piezoelectric layer to vibrate, and thus generates corresponding sound; and by setting a vibration cavity, on the one hand, it can provide direction and space for the vibration of the piezoelectric layer, thereby enabling the piezoelectric layer to obtain a larger amplitude and sound pressure level; at the same time, since the projection of the second electrode layer on the first substrate layer completely coincides with the projection of the vibration cavity on the first substrate layer, it can be ensured that the excitation voltage can accurately act on the piezoelectric layer in the corresponding area, and that the vibration position of the piezoelectric layer is consistent with the position of the cavity, thereby increasing the sound generation area and the corresponding sound generation effect; at the same time, the present invention designs the sound generator as a cylindrical structure, which is beneficial to improving the directional effect of the sound generation and at the same time can improve the vibration amplitude of the piezoelectric layer pushing the air and the corresponding sound pressure level, and can also improve the final electroacoustic conversion efficiency and reduce the loss of the sound pressure level, thereby ensuring the sound generation effect; and the sound generator of the present invention is arranged on the corresponding window glass, thereby reducing the overall volume of the device and improving the sound generation effect.

[0007] Preferably, the cross-sectional radius of the sound generator is 0.6 mm to 1.0 mm.

[0008] Preferably, the distance between two adjacent sound generators is 0.4 mm to 0.6 mm.

[0009] Preferably, the material of the first electrode layer is indium tin oxide, and the thickness of the first electrode layer is 0.06 μm-0.10 μm.

[0010] Preferably, the material of the second electrode layer is molybdenum, and the thickness of the second electrode layer is 0.20 μm-0.25 μm.

[0011] Preferably, the piezoelectric layer is a polyvinylidene fluoride film, and the thickness of the piezoelectric layer is 8 μm to 10 μm.

[0012] Preferably, the insulating layer is specifically SiN x The insulating layer has a thickness of 0.1 μm to 1 μm.

[0013] Preferably, the carrier layer is a polyimide film, and the thickness of the carrier layer is 10 μm to 20 μm.

[0014] Preferably, the connection layer is specifically an OCA optical adhesive layer, and the thickness of the connection layer is specifically 10 μm to 25 μm.

[0015] Preferably, both the first substrate layer and the second substrate layer are optical glass substrates, the thickness of the first substrate layer is 300 μm-700 μm, and the thickness of the second substrate layer is 50 μm-200 μm. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0017] Figure 1 It is a structural diagram of a telescopic display provided in the prior art; Figure 2 A structural diagram of a telescopic display provided in an embodiment of the present invention; Figure 3 A structural diagram of a first base layer and a sound generator provided in an embodiment of the present invention; Figure 4 A structural diagram of a sound generator provided in an embodiment of the present invention; Figure 5 This is a diagram of the sound pressure level simulation test results provided in an embodiment of the present invention.

[0018] Description of reference numerals:

[0019] The embodiments of the present invention will be further described below with reference to the accompanying drawings. DETAILED DESCRIPTION

[0020] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the embodiments of the present invention, and should not be construed as limiting the present invention.

[0021] In the description of the embodiments of the present invention, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0022] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the embodiments of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0023] In the embodiments of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific circumstances.

[0024] Embodiment 1 like Figure 2 , Figure 3 As shown, the first embodiment of the present invention provides a desktop telescopic display, comprising a display 1, a convex lens 2, a reflector 3, a beam splitter 4, a QWP quarter wave plate 5, a POL polarizer 6, and an AR anti-reflection film 7, which are arranged below the display 1. The convex lens 2, the reflector 3, and the beam splitter 4 are arranged correspondingly in sequence, so that the outgoing light of the display 1 passes through the convex lens 2 and is reflected to the reflector 3 by the beam splitter 4. The outgoing light is reflected by the reflector 3 and sequentially penetrates the beam splitter 4, the QWP quarter wave plate 5, the POL polarizer 6, and the AR anti-reflection film 7 until it reaches the human eye. Specifically, the above structure is the specific structure of the long-distance projection display in the prior art and its corresponding long-distance projection optical path principle, so it will not be described in detail in this application.

[0025] A plurality of sound generators 8 distributed in a rectangular array and arranged in a cylindrical shape are fixed on one side of the beam splitter 4 away from the QWP quarter wave plate 5, and a first substrate layer 9 is fixed on the bottom of the sound generator 8; Specifically, in the present application, the sound generator 8 is specifically a cylindrical structure, and is distributed in a rectangular array. Compared with the sound generator with a square structure, the sound generator provided in the present application has a large amplitude and a large vibration amplitude of the air driven under the same working environment and driving voltage, so the sound pressure level generated is also large, resulting in a high final electroacoustic conversion efficiency. In the present application, for a single sound generator 8, the sound pressure level of a single sound generator 8 obtained by simulation ranges from 67dB to 71dB. Through the relationship of the corresponding array sound pressure superposition, it can be seen that in order to ensure that the final sound pressure level of the long-distance display can reach more than 100dB, the corresponding number of sound generators 8 can be determined by conversion, which is approximately 53. In the present application, the rectangular array is arranged in a 6×9 manner, with a total of 54 sound generators 8.

[0026] At the same time, in order to ensure better acoustic sound effects and optimal operating frequencies, i.e., 30kHz~40kHz, in the present application, the cross-sectional radius of the sound generator 8 is set to 0.6mm~1.0mm, preferably 0.8mm, and the spacing between two adjacent sound generators 8 is set to 0.4mm~0.6mm, preferably 0.5mm. It should be noted that all dimensional requirements in the present application are based on the size of the first substrate layer 9, and the size of the first substrate layer 9 is 11.2mm×6.2mm.

[0027] like Figure 4 As shown, the sound generator 8 includes a first electrode layer 81, a piezoelectric layer 82 arranged below the first electrode layer 81, and an insulating layer 83 arranged below the piezoelectric layer 82. A cylindrical opening is opened at the bottom of the insulating layer 83, and a second electrode layer 84 is arranged in the cylindrical opening. The insulating layer 83 is arranged flush with the bottom of the second electrode layer 84. A bearing layer 85, a connecting layer 86 and a second substrate layer 87 are arranged in sequence below the second electrode layer 84 and the insulating layer 83. A vibration cavity 88 is arranged through the second substrate layer 87. The vibration cavity 88 is arranged in a cylindrical shape, and the vibration cavity 88 is arranged corresponding to the second electrode layer 84. The projection of the second electrode layer 84 on the first substrate layer 9 coincides with the projection of the vibration cavity 88 on the first substrate layer 9. Specifically, the material of the first electrode layer 81 is indium tin oxide, and the thickness of the first electrode layer 81 is 0.06 μm to 0.10 μm. By limiting the material of the first electrode layer 81, the visible light transmittance of the first electrode layer 81 can be improved, and the first electrode layer 81 has a lower resistivity and better wear resistance. In the present application, the thickness of the first electrode layer 81 is preferably 0.07 μm; The piezoelectric layer 82 is the main sound-generating element in the present application. The sound-generating principle is to apply an excitation voltage to the piezoelectric layer 82, control the piezoelectric layer 82 to vibrate itself and squeeze the surrounding air to vibrate, thereby achieving the effect of sound generation. The present application uses polyvinylidene fluoride film as the piezoelectric layer 82, so that the piezoelectric layer 82 has high elastic compliance coefficient, good flexibility, can be bent into different shapes and work in a resonant environment for a long time, has good processing performance, small mechanical quality factor, high Curie temperature, easy matching, good stability, low density, light weight, and little impact on the structure. At the same time, the thickness of the piezoelectric layer 82 in the present application is 8μm~10μm, preferably 9μm.

[0028] The second electrode layer 84 can cooperate with the first electrode layer 81 to generate a corresponding excitation voltage for the piezoelectric layer 82, thereby controlling the piezoelectric layer 82 to vibrate and make sound. In order to reduce the insertion loss as much as possible while avoiding affecting the electroacoustic conversion efficiency, the second electrode layer 84 adopts a metal electrode with high conductivity, namely a molybdenum metal electrode, and the thickness of the second electrode layer 84 is 0.20μm~0.25μm, preferably 0.22μm.

[0029] The insulating layer 83 can play a corresponding insulating role. In this application, SiN x The layer serves as the insulating layer 83, which has excellent insulating properties, and the thickness of the insulating layer 83 is 0.1μm~1μm, preferably 0.5μm. The bearing layer 85, the connecting layer 86, the second base layer 87 and the first base layer 9 can play a supporting role. The bearing layer is specifically a polyimide film, which has excellent high and low temperature resistance and can work for a long time in a temperature range of about ±280°C. The good electrical insulation and adhesion properties enable it to not only be well bonded to the second base layer 87 through the connecting layer 86 but also to further play an insulating role. The thickness of the bearing layer 85 is 10μm~20μm, preferably 20μm. The connecting layer 86 adopts OCA optical adhesive layer as the connecting material, which is colorless and transparent, with a light transmittance of more than 90% and good bonding strength. Moreover, the curing shrinkage of OCA is relatively small, which can make the surface after bonding smooth and free of wrinkles and bubbles, with almost no effect on the light transmittance of the displayed image, and can also increase the display contrast under strong light irradiation, thereby improving the corresponding display effect. The thickness of the connecting layer 86 is specifically 10μm~25μm, preferably 10μm, and the first substrate layer 9 and the second substrate layer 87 are both optical glass substrates. The two can be arranged in one piece or separately and bonded accordingly through optical glue, and the first substrate layer 9 and the second substrate layer 87 can be used as protective layers for the entire sound generator 8, which also has the characteristic of high light transmittance, which can meet the needs of installing the sound generator 8 on the window glass, and the thickness of the first substrate layer 9 is 300μm~700μm, preferably 600μm, and the thickness of the second substrate layer 87 is 50μm~200μm, preferably 150μm.

[0030] As for the vibration cavity 88, the vibration cavity 88 can be obtained by opening a corresponding cylindrical cavity on the second substrate layer 87. By setting the vibration cavity 88, the vibration mass of the sound generator 8 can be greatly reduced, thereby reducing the driving energy required for the sound generator and improving the corresponding electroacoustic conversion efficiency. At the same time, the vibration cavity 88 can also provide a corresponding cavity for the vibration of the piezoelectric layer 82, and the position of the vibration cavity 88 is set corresponding to the second electrode layer 84 to ensure that the excitation voltage can be accurately applied to the piezoelectric layer 82 in the corresponding area, thereby improving the uniformity of the sound. At the same time, since the first electrode layer 81 is the top structure of the sound generator 8, the first electrode layer 81 may be folded, bent or worn during its preparation. Once the above situation occurs, it may easily cause the piezoelectric layer 82 in the corresponding area to be unable to effectively sound. Therefore, by controlling the second electrode layer 84 located in the middle layer to be set corresponding to the vibration cavity 88, it can be ensured that the sound generator 8 can effectively sound and the sound is uniform when the voltage is applied.

[0031] It should be noted that, for the entire sound generator 8, all its components are transparent, so as to ensure that the outgoing light of the display 1 can be smoothly emitted. In this application, in order to further verify the sound effect of the application, the sound pressure level simulation test of the remote projection display is carried out, and the corresponding results are as follows: Figure 5 As shown, from Figure 5 It can be seen that the sound pressure level of the present application is the highest at 40kHz, which can reach 107dB, and no other peaks appear in the range, so this peak is the first-order frequency with the largest amplitude. Therefore, it can be proved that the present invention achieves the best self-adjustment effect near 40kHz, and the working frequency resonance point frequency is in line with expectations. Taking the resonance point frequency as the working frequency, the best ultrasonic self-demodulation audible sound performance can be obtained under ideal conditions, and the ultrasonic sound pressure level at the resonance point is better.

[0032] In summary, the present invention sets a sound generator 8, and applies an excitation voltage to the piezoelectric layer 82 to make the piezoelectric layer 82 vibrate, thereby making corresponding sounds. By setting the vibration cavity 88, on the one hand, it can provide direction and space for the vibration of the piezoelectric layer 82, so that the piezoelectric layer 82 can obtain a larger amplitude and sound pressure level. At the same time, since the projection of the second electrode layer 84 on the first substrate layer 9 and the projection of the vibration cavity 88 on the first substrate layer 9 completely coincide with each other, it can be ensured that the excitation voltage can accurately act on the piezoelectric layer 82 in the corresponding area, and the vibration position of the piezoelectric layer 82 is consistent with the position of the cavity, thereby increasing the sound area and the corresponding sound effect. At the same time, the present invention designs the sound generator 8 as a cylindrical structure, which can be beneficial to improving the directional effect of the sound while increasing the vibration amplitude of the piezoelectric layer 82 pushing the air and the corresponding sound pressure level, and can also improve the final electroacoustic conversion efficiency and reduce the loss of the sound pressure level to ensure the sound effect. The sound generator 8 of the present invention is arranged on the corresponding window glass, which reduces the overall volume of the equipment and improves the sound effect.

[0033] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A desktop telescopic display, comprising a display, a convex lens, a reflector and a beam splitter, a QWP quarter wave plate, a POL polarizer, and an AR anti-reflection film, each of which is disposed below the display. The convex lens, the beam splitter, and the reflector are disposed correspondingly in sequence, so that the outgoing light of the display passes through the convex lens and is reflected to the reflector by the beam splitter, and the outgoing light is reflected by the reflector and sequentially penetrates the beam splitter, the QWP quarter wave plate, the POL polarizer, and the AR anti-reflection film until it reaches the human eye, characterized in that: A plurality of sound generators distributed in a rectangular array and arranged in a cylindrical shape are fixed on one side of the beam splitter away from the QWP quarter wave plate, and a first substrate layer is fixed on the bottom of the sound generator; The sound generator includes a first electrode layer, a piezoelectric layer arranged below the first electrode layer, and an insulating layer arranged below the piezoelectric layer. A cylindrical opening is opened at the bottom of the insulating layer, and a second electrode layer is arranged in the cylindrical opening. The insulating layer and the bottom of the second electrode layer are arranged flush, and a bearing layer, a connecting layer and a second base layer are arranged in sequence below the second electrode layer and the insulating layer. A vibration cavity is arranged through the second base layer, and the vibration cavity is arranged in a cylindrical shape. The vibration cavity is arranged corresponding to the second electrode layer, and the projection of the second electrode layer on the first base layer coincides with the projection of the vibration cavity on the first base layer.

2. The desktop telescopic display according to claim 1, characterized in that: The cross-sectional radius of the sound generator is 0.6 mm to 1.0 mm.

3. The desktop telescopic display according to claim 1, characterized in that: The distance between two adjacent sound generators is 0.4 mm to 0.6 mm.

4. The desktop telescopic display according to claim 1, characterized in that: The material of the first electrode layer is indium tin oxide, and the thickness of the first electrode layer is 0.06 μm-0.10 μm.

5. The desktop telescopic display according to claim 1, characterized in that: The material of the second electrode layer is molybdenum, and the thickness of the second electrode layer is 0.20 μm-0.25 μm.

6. The desktop telescopic display according to claim 1, characterized in that: The piezoelectric layer is specifically a polyvinylidene fluoride film, and the thickness of the piezoelectric layer is 8 μm-10 μm.

7. The desktop telescopic display according to claim 1, characterized in that: The insulating layer is specifically SiN x The insulating layer has a thickness of 0.1 μm to 1 μm.

8. The desktop telescopic display according to claim 1, characterized in that: The bearing layer is specifically a polyimide film, and the thickness of the bearing layer is 10 μm-20 μm.

9. The desktop telescopic display according to claim 1, characterized in that: The connection layer is specifically an OCA optical adhesive layer, and the thickness of the connection layer is specifically 10 μm to 25 μm.

10. The desktop telescopic display according to claim 1, characterized in that: The first substrate layer and the second substrate layer are both optical glass substrates. The thickness of the first substrate layer is 300 μm to 700 μm, and the thickness of the second substrate layer is 50 μm to 200 μm.

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