Electronic blood pressure monitor

Abstract

The present application provides an electronic sphygmomanometer, comprising a cuff and a host detachably fixedly connected to the cuff, the host comprising a shell having an upper shell and a lower shell, and a display device arranged at one end of the shell in a first direction, wherein the display device comprises a nameplate from front to back in the first direction, the nameplate is fixedly connected to the lower shell in the first direction; a liquid crystal display LCD, the LCD has a light shielding layer on the front glass substrate and the rear glass substrate except for its display area, when observed from the second direction, the LCD has a step portion formed in a step shape by the front glass substrate and the rear glass substrate, and the step portion abuts against the lower shell; and a backlight source, the backlight source abuts against the LCD in the first direction. Through the embodiments of the present application, the problem of LCD light leakage is improved, the user experience is improved, and the LCD bracket is removed, the internal space of the host shell is saved, the cost is reduced, and the installation process is simplified.

Description

Technical Field

[0001] The embodiments of the present application relate to the field of medical health technology, and in particular to an electronic sphygmomanometer. Background Art

[0002] In existing electronic blood pressure monitors, especially in new generation integrated blood pressure monitors, in order to make the blood pressure monitor more portable and miniaturized, the blood pressure monitor host and the wristband (cuff) are usually fixed as one. In such a more portable electronic blood pressure monitor, the display device is usually arranged between the upper and lower shells of the host, and the display device includes a nameplate, a liquid crystal display (LCD), a backlight source, and an LCD bracket.

[0003] It should be noted that the above introduction to the background technology is only for the convenience of providing a clear and complete description of the technical solutions of the present application and facilitating the understanding of those skilled in the art. It cannot be considered that the above technical solutions are well known to those skilled in the art simply because they are described in the background technology section of the present application. Utility Model Content

[0004] The inventors found that in the above-mentioned existing structure, when viewing the LCD at a large tilt direction, the backlight source will leak light through the non-display area of ​​the LCD, resulting in a line of light being displayed, which gives the user a poor visual experience; and because the LCD and the backlight source require an LCD bracket to be fixed, the internal space of the host housing is occupied, making it difficult to layout other components in the narrow host housing, and the workpiece cost is high and the installation is cumbersome.

[0005] In order to solve one of the above problems or other similar problems, an embodiment of the present application provides an electronic blood pressure monitor, which improves the problem of LCD light leakage, improves user experience, removes the LCD bracket, saves the internal space of the host shell, reduces costs and simplifies the installation process.

[0006] According to one aspect of an embodiment of the present application, an electronic blood pressure meter is provided, comprising a cuff and a host detachably fixedly connected to the cuff, the host comprising a shell having an upper shell and a lower shell, and a display device arranged at one end of the shell in a first direction, wherein the display device comprises, from front to back in the first direction: a nameplate, the nameplate being fixedly connected to the lower shell in the first direction; a liquid crystal display screen LCD, the LCD having a shading layer on both the front glass substrate and the rear glass substrate except for its display area, when observed from a second direction, the LCD having a step portion formed in a step shape by the front glass substrate and the rear glass substrate, the step portion abutting against the lower shell; and a backlight source, the backlight source abutting against the LCD in the first direction.

[0007] In some embodiments, the light shielding layers are disposed on the upper and lower sides of the LCD.

[0008] In some embodiments, the light shielding rate of the light shielding layer is greater than or equal to 90%.

[0009] In some embodiments, a length of the front glass substrate of the LCD in the third direction is shorter than a length of the rear glass substrate of the LCD in the third direction.

[0010] In some embodiments, a distance between the rear surface of the nameplate and the front surface of the front glass substrate in the first direction is less than 2 mm.

[0011] In some embodiments, the lower shell has a first positioning portion, which is vertically formed on the upper surface of the lower shell and is arranged at the first end of the lower shell in the first direction, the rear surface of the first positioning portion abuts the front surface of the step portion, and the rear surface of the rear glass substrate of the LCD abuts the front surface of the backlight source.

[0012] In some embodiments, the surface of the first positioning portion facing the upper surface of the lower shell abuts against the upper surface of the step portion, the surface of the first positioning portion facing the upper shell abuts against the lower surface of the step portion, the inner surface of the first positioning portion facing the right side abuts against the left side surface of the LCD, and the inner surface of the first positioning portion facing the left side abuts against the right side surface of the LCD.

[0013] In some embodiments, the lower shell has a second positioning portion, which is vertically formed on the upper surface of the lower shell, and the second positioning portion includes: a first rib portion, which is arranged at the left end portion of the backlight source, and the right side surface of the first rib portion abuts against the left side end surface of the backlight source; a second rib portion, which is arranged at the left end portion of the backlight source, and the front side surface of the second rib portion abuts against the rear side surface of the backlight source; a third rib portion, which is arranged at the right end portion of the backlight source, and the left side surface of the third rib portion abuts against the right side end surface of the backlight source; and a fourth rib portion, which is arranged at the right end portion of the backlight source, and the front side surface of the fourth rib portion abuts against the rear side surface of the backlight source.

[0014] In some embodiments, the second positioning portion further includes: a fifth rib portion, and the lower surface of the backlight source abuts against the upper surface of the fifth rib portion.

[0015] In some embodiments, the upper housing has a third positioning portion, the third positioning portion is vertically formed on the lower surface of the upper housing, and the lower surface of the third positioning portion abuts against the upper surface of the backlight source.

[0016] One of the beneficial effects of the embodiments of the present application is that: according to the embodiments of the present application, the LCD has a shading layer on the front glass substrate and the rear glass substrate except for its display area, which improves the problem of LCD light leakage and improves user experience, and the step portion formed by the LCD that abuts against the lower shell saves the internal space of the host shell, and the LCD can be firmly fixed without using an LCD bracket, thereby reducing costs and simplifying the installation process.

[0017] With reference to the following description and accompanying drawings, the specific embodiments of the present application are disclosed in detail, indicating the way in which the principles of the present application can be adopted. It should be understood that the embodiments of the present application are not limited in scope. Within the scope of the spirit and clauses of the appended claims, the embodiments of the present application include many changes, modifications and equivalents. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The included drawings are used to provide a further understanding of the embodiments of the present application, which constitute a part of the specification, are used to illustrate the implementation methods of the present application, and together with the text description, explain the principles of the present application. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. In the drawings:

[0019] Figure 1 is a schematic diagram of an electronic blood pressure monitor according to an embodiment of the present application;

[0020] Figure 2 is a schematic diagram of a lower housing and a display device of an electronic sphygmomanometer according to an embodiment of the present application;

[0021] Figure 3 is from Figure 2 A cross-sectional view taken along line AA';

[0022] Figure 4 yes Figure 3 An enlarged view of the dotted box A1;

[0023] Figure 5 is another schematic diagram of the lower housing and the display device of the electronic blood pressure meter of an embodiment of the present application;

[0024] Figure 6 is another schematic diagram of the lower housing and the display device of the electronic blood pressure meter of an embodiment of the present application;

[0025] Figure 7 is another schematic diagram of the lower housing and the display device of the electronic blood pressure meter of an embodiment of the present application;

[0026] Figure 8 is from Figure 7 A partial cross-sectional view taken along line BB';

[0027] Fig. 9 is another schematic diagram of the lower housing of the electronic sphygmomanometer according to an embodiment of the present application;

[0028] Fig.10 Schematic diagram of the housing and display device of the electronic blood pressure meter according to an embodiment of the present application. DETAILED DESCRIPTION

[0029] With reference to the accompanying drawings, the above and other features of the present application will become apparent through the following description. In the description and the accompanying drawings, specific embodiments of the present application are specifically disclosed, which show some embodiments in which the principles of the present application can be adopted. It should be understood that the present application is not limited to the described embodiments. On the contrary, the present application includes all modifications, variations and equivalents falling within the scope of the attached claims.

[0030] In the embodiments of the present application, the terms "first", "second", etc. are used to distinguish different elements in terms of title, but do not indicate the spatial arrangement or temporal order of these elements, etc., and these elements should not be limited by these terms. The term "and / or" includes any one and all combinations of one or more of the associated listed terms. The terms "comprising", "including", "having", etc. refer to the presence of the stated features, elements, components or components, but do not exclude the presence or addition of one or more other features, elements, components or components.

[0031] In the embodiments of the present application, the singular forms "a", "the", etc. include plural forms and should be broadly understood as "a kind" or "a type" rather than being limited to the meaning of "one"; in addition, the term "said" should be understood to include both singular and plural forms, unless the context clearly indicates otherwise. In addition, the term "according to" should be understood as "at least in part according to...", and the term "based on" should be understood as "at least in part based on...", unless the context clearly indicates otherwise.

[0032] In the following description of this application, unless otherwise specified, the direction extending along the length of the blood pressure meter main unit is referred to as the "first direction" (hereinafter referred to as the "first direction"). Figure 2 The direction D1 shown in the figure is referred to as the “front side” or “front” of the backlight source and the direction D2 of the backlight source is referred to as the “rear side” or “rear” of the backlight source. The direction extending along the width of the blood pressure monitor mainframe is referred to as the “second direction” (as shown in the figure below). Figure 2 and Figure 7 direction D2), where Figure 7 The left side of the word is called the "left side" or "left side", such as Figure 7The right side in the figure is called the "right direction" or "right side"; the direction extending along the height of the blood pressure monitor main unit is called the "third direction" (as shown below Figure 3 The direction D3 shown in the figure, wherein the direction from the lower housing to the upper housing is called "upper" or "upper side", and the direction from the upper housing to the lower housing is called "lower" or "lower side". It is worth noting that these directions are defined only for the convenience of explanation and do not limit the orientation of the electronic blood pressure monitor during use and manufacturing.

[0033] The following describes the implementation methods of the embodiments of the present application in conjunction with the accompanying drawings. These implementation methods are only exemplary and are not intended to limit the embodiments of the present application.

[0034] An embodiment of the present application provides an electronic blood pressure monitor. Figure 1 is a schematic diagram of an electronic blood pressure meter according to an embodiment of the present application, showing a stereogram of the whole; Figure 2 is a schematic diagram of the lower housing and display device of the electronic sphygmomanometer of an embodiment of the present application, showing a top view of the electronic sphygmomanometer viewed from the main body side of the sphygmomanometer after removing the upper housing and wristband and other components; Figure 3 is from Figure 2 A cross-sectional view taken along line AA'; Figure 4 yes Figure 3 An enlarged view of the dashed box A1.

[0035] like Figures 1 to 4 As shown, the electronic sphygmomanometer 1 may include a cuff 10 and a host 20 detachably fixedly connected to the cuff 10, the host 20 includes a shell 21 having an upper shell 210 and a lower shell 211, and a display device 22 arranged at one end of the shell 21 in the first direction D1; the display device 22 may include a nameplate 221, a liquid crystal display (LCD) 222, and a backlight source 223 from the front side to the rear side in the first direction D1, wherein the nameplate 221 is fixedly connected to the lower shell 211 in the first direction D1, the LCD 222 has a shading layer on the front glass substrate 2221 and the rear glass substrate 2222 except its display area, and when observed from the second direction D2, the LCD 222 has a step portion ST formed in a step shape by the front glass substrate 2221 and the rear glass substrate 2222, and the step portion ST abuts against the lower shell 211. That is, the LCD 222 is coated with a light shielding layer on both the front glass substrate 2221 and the rear glass substrate 2222 , and the coated area is the non-display area of ​​the LCD 222 .

[0036] According to the above embodiment, the LCD 222 has a shading layer on both the front glass substrate 2221 and the rear glass substrate 2222 except for its display area, thereby improving the problem of LCD light leakage and improving the user experience. In addition, the step portion formed by the LCD 222 that abuts against the lower shell 211 saves the internal space of the host shell, and the LCD 222 can be firmly fixed without using an LCD bracket, thereby reducing costs and simplifying the installation process.

[0037] In the embodiment of the present application, there are non-display areas of the LCD 222 on both the upper and lower sides and the left and right sides, and the light shielding layer can be provided in both the non-display areas of the upper and lower sides and the non-display areas of the left and right sides to prevent light leakage on both the upper and lower sides and the left and right sides. However, since the light leakage phenomenon usually occurs on the upper and lower sides, that is, light leakage occurs at the upper and lower edges of the display area of ​​the LCD, the light shielding layer can be provided only in the non-display areas of the upper and lower sides, thereby further saving processes and costs.

[0038] In the embodiment of the present application, the material forming the light shielding layer may be black ink, film, etc. Since the light shielding density of the light shielding layer is too small and may not achieve the light shielding effect, and too large may also affect the visual effect, etc., it is necessary to select a material with a suitable light shielding density to form the light shielding layer. For example, the light shielding rate of the material forming the light shielding layer may be greater than or equal to 90%, that is, the light shielding rate of the light shielding layer formed thereby is greater than or equal to 90%.

[0039] In the embodiment of the present application, the nameplate 221 can be fixed to the lower shell 211 by bonding, for example.

[0040] In the embodiments of the present application, Figure 4 As shown, the dotted line L1 is roughly the dividing line between the front glass substrate 2221 and the rear glass substrate 2222 of the LCD 222. The length of the front glass substrate 2221 in the third direction D3 is W1, and the length of the rear glass substrate 2222 in the third direction D3 is W2. Figure 4 As shown, the length W1 of the front glass substrate 2221 in the third direction D3 is less than the length W2 of the rear glass substrate 2222 in the third direction D3. Thus, the cross section of the LCD 222 in the third direction D3 is substantially formed in a step shape, that is, the step portion ST of the LCD 222 may be formed by setting the length W1 of the front glass substrate 2221 in the third direction D3 to be shorter than the length W2 of the rear glass substrate 2222 in the third direction D3. However, the present application is not limited thereto, and any method of setting the LCD 222 to have the step portion ST may be included in the present application.

[0041] In the embodiments of the present application, Figure 4As shown, the front glass substrate 2221 is approximately centered relative to the rear glass substrate 2222 in the third direction D3, that is, the upper surface of the front glass substrate 2221 is not aligned with the upper surface of the rear glass substrate 2222, and the lower surface of the front glass substrate 2221 is not aligned with the lower surface of the rear glass substrate 2222, thereby forming step portions ST on both the upper and lower sides of the LCD 222. In other words, the cross-section of the LCD 222 in the third direction D3 is approximately convex, so that the front glass substrate 2221 is easily embedded in the lower housing 211.

[0042] In the embodiment of the present application, by setting the length W1 of the front glass substrate 2221 in the third direction D3 to be shorter than the length W2 of the rear glass substrate 2222 in the third direction D3, not only can the LCD 222 be set to have a step portion ST to facilitate positioning of the LCD 222, but also the distance between the nameplate 221 and the LCD 222 in the first direction can be shortened. This is because the front glass substrate 2221 is embedded in the lower housing 211, thereby shortening the distance between the nameplate 221 and the LCD 222 in the first direction.

[0043] For example, Figure 4 As shown, the distance W3 between the rear surface of the nameplate 221 and the front surface of the front glass substrate 2221 in the first direction D1 may be less than 2 mm. In the embodiment of the present application, the distance W3 may also be adaptively adjusted based on the specifications of the liquid crystal, for example, W3 may be 0.9 mm or even 0.6 mm or close to zero. The smaller W3 is, the less light from the liquid crystal may leak out, thereby further improving the user experience.

[0044] Figure 5 is another schematic diagram of the lower housing and the display device of the electronic blood pressure meter of the embodiment of the present application, showing a stereoscopic view when viewed from the front side after the nameplate is removed; Figure 6 is another schematic diagram of the lower housing and the display device of the electronic blood pressure meter of the embodiment of the present application, showing a partial stereoscopic view when viewed from the rear upper side; Figure 7 is another schematic diagram of the lower housing and the display device of the electronic sphygmomanometer of the embodiment of the present application, showing a side view when viewed from the left side after the nameplate is removed; Figure 8 is from Figure 7 A partial cross-sectional view taken along line BB'; Fig. 9 is another schematic diagram of the lower housing of the electronic blood pressure meter according to an embodiment of the present application, showing a top view when viewed from the upper side after removing the backlight source; Fig.10 The schematic diagram of the housing and display device of the electronic blood pressure meter according to the embodiment of the present application shows a side view of the upper housing when viewed from the right side.

[0045] In the embodiments of the present application, Figure 4 , Figure 5 and Figure 6 As shown, the lower shell 211 has a first positioning portion 2111, the first positioning portion 2111 is vertically formed on the upper surface F1 of the lower shell 211 and is arranged at the first end E1 of the lower shell 211 in the first direction D1, the rear surface F2 of the first positioning portion 2111 abuts against the front surface F3 of the step portion ST; the rear surface F4 of the rear glass substrate 2222 of the LCD 222 abuts against the front surface F5 of the backlight source 223, that is, the rear surface F4 of the rear glass substrate 2222 abuts against the front surface F5 of the backlight source 223 in the first direction D1.

[0046] Thereby, positioning of the LCD 222 in the first direction D1 (front-rear direction) is achieved.

[0047] In the embodiments of the present application, Figure 4 As shown, the surface F6 of the first positioning portion 2111 facing the upper surface F1 of the lower shell 211 abuts against the upper surface F7 of the step portion ST, and the first positioning portion 2111 facing the upper shell 210 (at Figure 4 A surface F8 (not shown) abuts against a lower surface F9 of the step portion ST.

[0048] Thereby, positioning of the LCD 222 in the third direction D3 (up and down direction) is achieved.

[0049] In the embodiment of the present application, the surface F6 of the first positioning portion 2111 facing the upper surface F1 of the lower housing 211 and the upper surface F7 of the step portion ST can be formed into an interference fit so as to abut against each other, so that the installation stability of the LCD 222 is higher and it is not easy to shake. Figure 4 As shown, F6 of the first positioning portion 2111 and the upper surface F7 of the step portion ST form a clearance fit, so that during assembly, the LCD 222 is easily embedded in the inner surface of the first positioning portion 2111, thereby facilitating installation.

[0050] In the embodiments of the present application, Figure 7 and Figure 8 As shown, the inner surface F10 of the first positioning portion 2111 facing the right side abuts against the left side surface F11 of the LCD 222 , and the inner surface F12 of the first positioning portion 2111 facing the left side abuts against the right side surface F13 of the LCD 222 .

[0051] Thereby, positioning of the LCD 222 in the second direction D2 (left-right direction) is achieved.

[0052] Similarly, the inner surface F10 of the first positioning portion 2111 facing the right side and the left side surface F11 of the LCD 222 may be an interference fit or a clearance fit. The interference fit is beneficial to the stability of the LCD 222 , while the clearance fit is beneficial to the installation of the LCD 222 .

[0053] In the embodiment of the present application, based on the structure of the first positioning portion 2111 described above, as Figure 5 As shown, the first positioning portion 2111 can be formed as a window frame structure perpendicular to the upper surface F1 of the lower shell 211, which is conducive to the front glass substrate 2221 of the LCD 222 being embedded in the inner surface of the first positioning portion 2111, and is also conducive to the positioning of the LCD 222 in the first direction, the second direction and the third direction.

[0054] In the embodiments of the present application, Figure 8 and Fig. 9 As shown, the lower housing 211 has a second positioning portion 2112, and the second positioning portion 2112 is vertically formed on the upper surface F1 of the lower housing 211, wherein the second positioning portion 2112 may include: a first rib 2112-1, the first rib 2112-1 is arranged at the left end E2 of the backlight source 223, and the right side surface F14 of the first rib 2112-1 abuts against the left side end surface F15 of the backlight source 223; a second rib 2112-2, the second rib 2112-2 is arranged at the left end E2 of the backlight source 223, and the second rib The front side surface F16 of 2112-2 abuts against the rear side surface F17 of the backlight source 223; the third rib 2112-3, the third rib 2112-3 is arranged at the right end portion E3 of the backlight source 223, and the left side surface F18 of the third rib 2112-3 abuts against the right side end surface F19 of the backlight source 223; and the fourth rib 2112-4, the fourth rib 2112-4 is arranged at the right end portion E3 of the backlight source 223, and the front side surface F20 of the fourth rib 2112-4 abuts against the rear side surface F17 of the backlight source 223.

[0055] Thereby, positioning of the backlight source 223 in the first direction (front-rear direction) and the second direction (left-right direction) is achieved.

[0056] In the embodiments of the present application, Fig. 9 and Fig.10 As shown, the second positioning portion 2112 may also include: a fifth rib 2112-5, the lower surface F21 of the backlight source 223 abuts against the upper surface F22 of the fifth rib 2112-5; the upper shell 210 may have a third positioning portion 2101, the third positioning portion 2101 is vertically formed on the lower surface F23 of the upper shell 210, and the lower surface F24 of the third positioning portion 2101 abuts against the upper surface F25 of the backlight source 223.

[0057] Thereby, the backlight source 223 is positioned in the third direction (up and down direction).

[0058] In the embodiment of the present application, the fifth rib 2112 - 5 and the third positioning portion 2101 can be arranged as a pair opposite to each other in the up-down direction, or can be arranged as two pairs opposite to each other in the up-down direction at the left and right ends of the backlight source 223 .

[0059] In the embodiments of the present application, Fig. 9 As shown, the first rib 2112 - 1 and the second rib 2112 - 2 can be integrally formed into an L-shape.

[0060] In the embodiment of the present application, by directly positioning the LCD 222 and the backlight source 223 using the structure of the lower shell 211 and the upper shell 210, the bracket components for positioning the LCD 222 and the backlight source 223 can be omitted, thereby saving space and making the sphygmomanometer more miniaturized.

[0061] The above only describes the structures related to the electronic blood pressure meter 1 in the embodiment of the present application. The present application is not limited thereto. The electronic blood pressure meter 1 may also include other conventional structures. For details, please refer to the relevant technology, and the description is omitted here.

[0062] According to the present embodiment, the LCD 222 has a shading layer on both the front glass substrate 2221 and the rear glass substrate 2222 except for its display area, thereby improving the problem of LCD light leakage and enhancing the user experience. In addition, the step portion formed by the LCD 222 that abuts against the lower shell 211 saves the internal space of the host shell, and the LCD 222 can be firmly fixed without using an LCD bracket, thereby reducing costs and simplifying the installation process.

[0063] The present application is described above in conjunction with specific embodiments, but it should be clear to those skilled in the art that these descriptions are exemplary and are not intended to limit the scope of protection of the present application. Those skilled in the art can make various modifications and variations to the present application based on the spirit and principles of the present application, and these modifications and variations are also within the scope of the present application.

[0064] The preferred embodiments of the present application are described above with reference to the accompanying drawings. Many features and advantages of these embodiments are clear from this detailed description, and therefore the appended claims are intended to cover all such features and advantages of these embodiments that fall within their true spirit and scope. In addition, since many modifications and changes are easily conceivable to those skilled in the art, the embodiments of the present application are not intended to be limited to the precise structures and operations illustrated and described, but all suitable modifications and equivalents that fall within their scope may be covered.

Claims

1. An electronic sphygmomanometer, comprising a cuff and a host detachably fixedly connected to the cuff, the host comprising a shell having an upper shell and a lower shell, and a display device arranged at one end of the shell in a first direction, characterized in that: The display device comprises, from front to back in a first direction: A nameplate, the nameplate being fixedly connected to the lower housing in a first direction; A liquid crystal display LCD, wherein the LCD has a light shielding layer on both the front glass substrate and the rear glass substrate except for the display area thereof, and when observed from the second direction, the LCD has a step portion formed in a step shape by the front glass substrate and the rear glass substrate, and the step portion abuts against the lower housing; and A backlight source is provided, wherein the backlight source abuts against the LCD in a first direction.

2. The electronic sphygmomanometer according to claim 1, characterized in that: The light shielding layers are arranged on the upper and lower sides of the LCD.

3. The electronic sphygmomanometer according to claim 1 or 2, characterized in that: The shading rate of the shading layer is greater than or equal to 90%.

4. The electronic sphygmomanometer according to claim 1, characterized in that: A length of the front glass substrate of the LCD in the third direction is shorter than a length of the rear glass substrate of the LCD in the third direction.

5. The electronic sphygmomanometer according to claim 4, characterized in that: A distance between the rear surface of the nameplate and the front surface of the front glass substrate in the first direction is less than 2 mm.

6. The electronic sphygmomanometer according to claim 1, characterized in that: The lower shell has a first positioning portion, which is vertically formed on the upper surface of the lower shell and is arranged at a first end of the lower shell in the first direction, and the rear surface of the first positioning portion abuts against the front surface of the step portion. The rear surface of the rear glass substrate of the LCD abuts against the front surface of the backlight source.

7. The electronic sphygmomanometer according to claim 6, characterized in that: The surface of the first positioning portion facing the upper surface of the lower shell abuts against the upper surface of the step portion, and the surface of the first positioning portion facing the upper shell abuts against the lower surface of the step portion. The inner surface of the first positioning portion facing the right side abuts against the left side surface of the LCD, and the inner surface of the first positioning portion facing the left side abuts against the right side surface of the LCD.

8. The electronic sphygmomanometer according to claim 1 or 6, characterized in that: The lower shell has a second positioning portion, and the second positioning portion is vertically formed on the upper side surface of the lower shell. The second positioning portion includes: a first rib portion, the first rib portion being disposed at a left end portion of the backlight source, and a right side surface of the first rib portion being in contact with a left side end surface of the backlight source; a second rib portion, the second rib portion being disposed at a left end portion of the backlight source, and a front surface of the second rib portion being in contact with a rear surface of the backlight source; a third rib portion, the third rib portion being disposed at a right end portion of the backlight source, a left side surface of the third rib portion being in contact with a right side end surface of the backlight source; and A fourth rib portion is disposed at a right end portion of the backlight source, and a front surface of the fourth rib portion abuts against a rear surface of the backlight source.

9. The electronic sphygmomanometer according to claim 8, characterized in that: The second positioning portion further includes: A fifth rib portion, wherein the lower surface of the backlight source abuts against the upper surface of the fifth rib portion.

10. The electronic sphygmomanometer according to claim 9, characterized in that: The upper housing has a third positioning portion, which is vertically formed on the lower surface of the upper housing, and the lower surface of the third positioning portion abuts against the upper surface of the backlight source.

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