Liquid crystal interactive all-in-one machine

Abstract

The application provides a liquid crystal interactive all-in-one machine, which is used to solve the problem of unclear screen display of the liquid crystal interactive all-in-one machine. The liquid crystal interactive all-in-one machine comprises a glass cover plate and a liquid crystal display screen, the glass cover plate covers the display side of the liquid crystal display screen, the ratio between the roughness Ra of the surface of the glass cover plate and the roughness Rsm is not greater than 0.005, so that the transmittance of the glass cover plate is not less than 88%, the haze is not greater than 25%, and the distinctness-of-image is any value between 0.2 and 1.2.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electronics, and particularly relates to a liquid crystal interactive all-in-one machine. BACKGROUND

[0002] With the development of liquid crystal display screens, users have higher and higher use requirements for touch all-in-one machine devices. The touch all-in-one machine is an intelligent human-computer interaction device, mainly composed of a touch display screen, a computer mainboard hard disk, a processor and the like. At present, the touch display screen in the touch all-in-one machine is one of the important factors affecting user experience; in particular, the glass cover plate on the touch display screen directly affects the interaction effect of the user and the liquid crystal interactive all-in-one machine, for example, the user cannot write on the liquid crystal interactive all-in-one machine, the displayed font is not clear, and the like. SUMMARY

[0003] The present application provides a liquid crystal interactive all-in-one machine to solve the problem of unclear screen display of the liquid crystal interactive all-in-one machine.

[0004] The present application provides a liquid crystal interactive all-in-one machine, comprising a glass cover plate and a liquid crystal display screen, the glass cover plate covers the display side of the liquid crystal display screen, the ratio between the roughness Ra of the surface of the glass cover plate and the roughness Rsm is not greater than 0.005, so that the transmittance of the glass cover plate is not less than 88%, the haze is not greater than 25%, and the distinctness of image is any value between 0.2 and 1.2.

[0005] The liquid crystal interactive all-in-one machine in the above application embodiment controls the ratio between the roughness Ra and the roughness Rsm, ensures that the transmittance, haze and distinctness of image, i.e. the definition, of the glass cover plate in the liquid crystal interactive all-in-one machine meet the set threshold, so as to provide a more comfortable use experience for the user.

[0006] In a possible implementation, the roughness Rsm is not greater than 150 microns, so that the interference between the micro-morphology of the glass cover plate and the pixel points of the liquid crystal display screen causes the flash point density to be not more than a first set range.

[0007] In a possible implementation, the roughness Rz of the surface of the glass cover plate is greater than 3 microns, and the roughness Ra is greater than 0.5 microns, so that the chalk writing on the glass cover plate is within a second set range.

[0008] In a possible implementation, the roughness Ra is any value between 0.5 microns and 0.8 microns.

[0009] In a possible implementation, the glossiness of the glass cover plate is any value between 24GU and 38GU.

[0010] In a possible implementation, the glass cover plate has a haze of any value between 18% and 25%.

[0011] In a possible implementation, the glass cover plate has a substrate of at least one of aluminum-silicon glass, borosilicate glass, or soda-lime glass. BRIEF DESCRIPTION OF DRAWINGS

[0012] Figure 1 A structure diagram of a liquid crystal interactive all-in-one machine suitable for embodiments of the present application;

[0013] Figure 2 A schematic diagram of a cross section of a glass cover plate provided by embodiments of the present application;

[0014] Figure 3 A roughness parameter diagram provided by embodiments of the present application;

[0015] Figure 4 A flash point phenomenon diagram provided by embodiments of the present application;

[0016] Figure 5 Microscopic surface diagrams of a glass substrate before and after chemical polishing provided by embodiments of the present application. DETAILED DESCRIPTION

[0017] To address the problem of insufficient display clarity of a glass cover plate of a liquid crystal interactive all-in-one machine in the prior art, embodiments of the present application provide a liquid crystal interactive all-in-one machine. In the liquid crystal interactive all-in-one machine, the ratio between the roughness Ra of the surface of the glass cover plate and the roughness Rsm is controlled to be no greater than 0.005, so that the clarity of the glass cover plate meets the set requirements. That is, in embodiments of the present application, the microscopic parameters of the surface of the glass cover plate of the liquid crystal interactive all-in-one machine are controlled, so that the clarity of the glass cover plate is regulated, thereby optimizing the user experience.

[0018] To better understand the above technical solutions, the technical solutions of the present application are described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific features in the embodiments of the present application and the embodiments are detailed descriptions of the technical solutions of the present application, and are not limitations of the technical solutions of the present application. In the case of no conflict, the technical features in the embodiments of the present application and the embodiments can be combined with each other.

[0019] Embodiments of the present application provide a liquid crystal interactive all-in-one machine to solve the problem of insufficient screen clarity of the liquid crystal interactive all-in-one machine.

[0020] The liquid crystal interactive all-in-one machine includes a glass cover plate and a liquid crystal display screen, and the glass cover plate covers the display side of the liquid crystal display screen.

[0021] The structure of the liquid crystal interactive all-in-one machine is first introduced as follows, please refer to Figure 1 .Figure 1 As shown, the components of the liquid crystal interactive all-in-one machine include: a glass cover plate, a glass fixed plate, a buffer foam, a liquid crystal display screen, a support foam, an optical film assembly, a back plate, a light emitting element, and a circuit substrate. The light emitting element can be composed of an LED chip and an LED light bar (array). The light emitting element is fixed in the liquid crystal interactive all-in-one machine by the back plate, is powered by the circuit substrate to emit light, and the light emitted by the light emitting element passes through the optical film assembly to form a uniform backlight source. The optical film assembly is arranged above the circuit substrate and the light emitting element. The liquid crystal display screen (Open Cell, OC) is fixed above the optical film assembly by the support foam, and the liquid crystal display screen applies voltage to the pixel area through the TFT (Thin Film Transistor) therein, and controls the deflection angle of the liquid crystal in the pixel area, so as to control the opening and closing of the red, green and blue (RGB) three different pixels, thereby achieving the purpose of controlling different pixel points to display different brightness and different colors. The glass cover plate is fixed by the buffer foam and covers the display side of the liquid crystal display screen, which can protect the liquid crystal display screen and provide a writing surface. Further, for the glass cover plate, since it covers the liquid crystal display screen, that is, it is located in front of the entire liquid crystal display screen. Therefore, the performance parameters of the glass cover plate largely determine the user experience. The most important one is the definition.

[0022] Generally, the definition can be represented by the number of lines that can be distinguished under a fixed observation angle. Here, the number of lines includes the color of the font and the frame structure that can be seen to a certain line. In the embodiments of the present application, the number of lines of the font with a size of 15 mm under a 60° viewing angle is taken as the basis for determining the definition. Because the haze of the glass cover plate directly affects the definition, that is, the greater the haze of the glass cover plate, the worse the definition. Therefore, in the embodiments of the present application, the haze is not greater than 25% under the condition that the transmittance of the glass cover plate is not less than 88%.

[0023] Further, the distinctness of image is another parameter that can be used to represent the definition of the font or image seen by the eye after reflection on the surface of the glass cover plate. The expression of the distinctness of image Haze a can be:

[0024]

[0025] In order to make the use of the liquid crystal interactive all-in-one machine in the embodiments of the present application not affected by the reflection phenomenon on the surface of the glass cover plate, the distinctness of image is set to any value between 0.2 and 1.2 in the embodiments of the present application.

[0026] Of course, the setting of the distinctness of image and the haze of the surface of the glass cover plate indicates that the glass light plate is not smooth. Therefore, reflection phenomenon will occur. That is, the micro-topography of the glass cover plate is composed of continuous and / or discontinuous concave-convex structures. Figure 2This is a schematic diagram of the cross-section of the glass cover. (For example...) Figure 2 As shown, the surface of the glass cover is not smooth, exhibiting raised or recessed features, and the specific morphology of these protrusions and depressions can affect the clarity of the glass cover. Therefore, it is necessary to control the microstructure of the glass cover to ensure clarity.

[0027] The following describes the parameters for protrusions and depressions in the microstructure of the glass cover plate. It should be noted that in the embodiments of this application, the depressions of the glass cover plate correspond to "valleys" or "troughs" in the following parameter descriptions, while the protrusions correspond to "peaks" or "peaks" in the following parameter descriptions. Please refer to... Figure 3 The parameters used in this application to measure the surface roughness of the glass cover may include:

[0028] The arithmetic mean deviation of the profile Ra (i.e., roughness Ra) is the arithmetic mean of the absolute values ​​of the profile offsets over the sampling length (lr). Here, profile offset refers to the distance between a point on the profile and the baseline in the measurement direction. Figure 3 As shown in section (a), in this embodiment of the application, Ra is used as a parameter to measure the height of the wave crest, and the baseline is the horizontal coordinate (x) axis.

[0029] Maximum profile height Rz (i.e., roughness Rz): The distance between the peak and valley lines of the profile. For example... Figure 3 As shown in part (b) of the document.

[0030] The average width Rsm of the profile element (i.e., roughness Rsm): the average spacing of the micro-irregularities of the profile within the sampling length. A profile element is a combination of a profile peak and adjacent profile valleys. For example... Figure 3 As shown in section (c), In this embodiment, Rsm is used as a parameter to measure the spacing between wave crests. That is, the smaller Rsm is, the denser the wave crests are.

[0031] As described in the roughness parameters Ra and Rsm above, a larger ratio between Ra and Rsm indicates a smaller Rsm, meaning more concentrated peaks. Furthermore, more concentrated peaks mean a steeper slope from the baseline (or trough) to the peak, resulting in greater light dispersion. Therefore, the ratio of Ra to Rsm of the glass cover is inversely proportional to sharpness; the larger the ratio, the lower the sharpness of the glass cover. Thus, in this embodiment, the ratio of Ra to Rsm of the glass cover surface is set to no more than 0.005 to ensure the sharpness of the glass cover, which determines the transmittance, haze, and clarity of the glass cover parameters.

[0032] Therefore, in an LCD interactive all-in-one machine, in order for users to clearly see the content displayed on the LCD screen through the glass cover, it is first necessary to ensure the clarity of the glass cover. Thus, in this embodiment, the following control parameters are set: the ratio between the surface roughness Ra and the surface roughness Rsm of the glass cover is not greater than 0.005, such that the transmittance of the glass cover is not less than 88%, the haze is not greater than 25%, and the sharpness is any value between 0.2 and 1.2.

[0033] Furthermore, it is also necessary to control the flash point phenomenon of the glass cover. The flash point is a phenomenon caused by interference when glass particles on the surface of the glass cover are similar in size to the pixels of the liquid crystal display. For example... Figure 4 The diagram illustrates the flash point phenomenon. Part (a) shows a more severe flash point phenomenon than part (b). Therefore, to avoid flash point occurrence, it is necessary to control the size difference between the particles on the glass cover and the pixels on the liquid crystal display. To ensure this size difference and prevent flash points from affecting the use of the LCD interactive all-in-one machine, it is necessary to control the roughness (Rsm) at a low level. However, since a smaller Ra / Rsm ratio is more beneficial for clarity when controlling the glass cover's sharpness, the Rsm value cannot be reduced indiscriminately. In this embodiment, the roughness Rsm is set to no more than 150 micrometers, ensuring that the flash point density caused by interference between the microstructure of the glass cover and the pixels of the liquid crystal display does not exceed a first set range. That is, when Rsm is less than or equal to 150 micrometers, it can be ensured that there is no interference between the glass cover and the liquid crystal display, or even if interference occurs with smaller pixel sizes, the impact on the user is negligible.

[0034] Furthermore, when LCD interactive all-in-one machines are used in the education industry, users often need to write on the screen. Therefore, in this embodiment, to ensure that chalk can write on the glass cover of the LCD interactive all-in-one machine, that is, to ensure that the degree of chalk residue when writing on the glass cover is within a second set range. Regarding the microstructure of the glass cover, the higher the peak, that is, the greater the distance difference between the protrusions and depressions, the more continuously and clearly the chalk can write; therefore, the roughness Rz of the glass cover is set to be greater than 3 micrometers, and the roughness Ra is greater than 0.5 micrometers. It should be noted that the above-mentioned degree of chalk residue can be the volume of chalk consumed when writing the same content on the blackboard; therefore, the second set range is the volume of chalk consumed when the writing trajectory on the glass cover is continuous and clear. Preferably, the roughness Ra is set to any value between 0.5 micrometers and 0.8 micrometers, which can simultaneously take into account the degree of chalk residue when writing on the blackboard, avoiding flashing, without affecting the content displayed on the LCD screen through the glass cover.

[0035] Further, in the embodiments of the present application, the glossiness of the glass cover plate can be set to any value between 24GU and 38GU to ensure that the glass surface does not produce glare that affects the normal use of the liquid crystal interactive all-in-one machine by the user. Glossiness is generally used to indicate the degree to which the surface of an object approaches a mirror surface. Its reference standard is black glass with a refractive index np = 1.567. Assuming that the plane thereof is in an ideal polished state, the glossiness value is defined as 100.0 gloss units when the plane reflects a natural light beam in a mirror direction. The glossiness value signifies the percentage of the reflected amount.

[0036] Further, since the higher the glossiness, the clearer the content on the liquid crystal display screen can be seen through the glass cover plate, the higher the glossiness, the clearer the glass cover plate, and the lower the haze. That is, the glossiness and the haze are inversely proportional. Therefore, when the glossiness is ensured to be 24GU to 38GU, the haze needs to be ensured to be no less than 18%. Therefore, the haze of the glass cover plate can be further set to any value between 18% and 25%.

[0037] Generally, the glass substrate can be etched by the steps of cleaning, shielding, frosting, polishing, unshielding, and clearing to obtain the glass cover plate that satisfies the above parameters. The preparation of the glass cover plate in the embodiments of the present application is described below.

[0038] First, the positions of the glass substrate that do not need to be etched are shielded. The shielding method can be that a material resistant to hydrofluoric acid is coated on the surface of the glass cover plate, for example, polytetrafluoroethylene. Then, the glass substrate can be subjected to frosting treatment to obtain a glass substrate with a certain roughness. During the frosting treatment, the frosting agent can be KN-02 frosting powder, the frosting treatment time is 100s to 130s, and the corresponding treatment temperature is 40°C to 42°C. Generally, the roughness Ra of the glass substrate subjected to the frosting treatment is 0.65 microns to 0.95 microns, the roughness Rsm is 120 to 150 microns, and impurities are attached to the surface. Then, the glass substrate is subjected to chemical polishing. Chemical polishing refers to etching liquid with hydrofluoric acid as the main component to mainly change the curvature or height of the micro-surface peaks of the glass substrate. Therefore, the surface of the glass substrate subjected to chemical polishing mainly changes the roughness Ra to 0.5 microns to 0.8 microns, while the roughness Rsm remains unchanged. As shown in FIG. 8, the micro-surface of the glass substrate before and after chemical polishing is shown. Part (a) is before polishing, and part (b) is after polishing. Finally, the chemical substances used for shielding are removed from the surface of the glass substrate, and the surface is cleaned to obtain the glass cover plate. The glass substrate of the glass cover plate described above can be at least one of aluminum-silicon glass, boron-silicon glass, or soda-lime glass. Figure 5

[0039] ​Correspondingly, if the glass cover plate prepared (produced) according to the above method does not meet the parameter requirements of the liquid crystal interactive all-in-one machine provided in the present application, the preparation parameters of the above glass cover plate preparation steps need to be adjusted in sequence to obtain the parameters of the glass cover plate provided in the present application, so as to ensure the clarity of the liquid crystal interactive all-in-one machine and the user experience.

[0040] It should be noted that the parameter control of the glass cover plate and the corresponding range in the embodiments of the present application are not only applicable to the liquid crystal interactive all-in-one machine, but also applicable to other display devices which need to cover the display screen display side with the glass cover plate.

[0041] Obviously, those skilled in the art can make various modifications and variations to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application belong to the scope of the claims of the present application and their equivalents, the present application also intends to include these modifications and variations.

Claims

1. A liquid crystal interactive all-in-one machine, comprising a glass cover plate and a liquid crystal display screen, the glass cover plate covering the display side of the liquid crystal display screen, characterized in that, The ratio between the roughness Ra of the surface of the glass cover plate and the roughness Rsm is not more than 0.005, so that the transmittance of the glass cover plate is not less than 88%, the haze is not more than 25%, and the distinctness of image is any value between 0.2 and 1.

2. 2.The liquid crystal interactive all-in-one machine of claim 1, wherein, The roughness Rsm is not more than 150 microns, so that the interference between the micro-topography of the glass cover plate and the pixel points of the liquid crystal display screen does not result in a flash point density exceeding a first set range. 3.The liquid crystal interactive all-in-one machine of claim 2, wherein, The roughness Rz of the surface of the glass cover plate is more than 3 microns, and the roughness Ra is more than 0.5 microns, so that the degree of chalk adhesion when chalk is written on the glass cover plate is within a second set range.

4. The liquid crystal interactive all-in-one machine of claim 3, wherein, The roughness Ra is any value between 0.5 microns and 0.8 microns.

5. The liquid crystal interactive all-in-one machine according to any one of claims 1-4, characterized in that, The glossiness of the glass cover plate is any value between 24 GU and 38 GU. 6.The liquid crystal interactive all-in-one machine of claim 5, wherein, The haze of the glass cover plate is any value between 18% and 25%. 7.The liquid crystal interactive all-in-one machine of claim 6, wherein, The base material of the glass cover plate is at least one of aluminum-silicon glass, boron-silicon glass, or soda-lime glass.

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