A screen integrated black adjustment system and adjustment method

Abstract

This invention provides a screen integrated black adjustment system and method. The screen integrated black adjustment system includes a backlight assembly with a black cover glass at the light-emitting end, a display panel, a hollow bonding block surrounding the display panel with an injection port and an outlet, a light-collecting assembly for collecting natural light to obtain the illumination direction of the natural light relative to the screen, an injection assembly connected to the injection port for injecting filling ink into the bonding block, a controller communicatively connected to both the light-collecting assembly and the injection assembly for controlling the type and injection parameters of the filling ink injected into the bonding block according to the illumination direction of the natural light, and a heat dissipation assembly connected to the outlet for dissipating heat from the filling ink flowing out of the bonding block. The screen integrated black adjustment system provided by this application has strong adaptability and good integrated black display effect.

Description

Technical Field

[0001] This invention relates to the field of liquid crystal display panel adjustment technology, specifically to an integrated black adjustment system and method for a screen. Background Technology

[0002] With the rapid development of the electronics industry, electronic products are increasingly entering people's work and life; LCD (Liquid Crystal Display) is also known as liquid crystal display panel. Liquid crystal display panels have very low power consumption, so they are highly favored by engineers.

[0003] Outdoor screens are those frequently used outdoors and are affected by the outdoor environment and climate. Regarding lighting, the main source of light is sunlight, which contains a large amount of ultraviolet radiation. This ultraviolet light penetrates the screen and affects various internal components, reducing its lifespan. The screen is divided into a display area and a non-display area. The cover glass is generally larger than the display area, with the surrounding area being the non-display area. To ensure that the surrounding non-display area appears the same black as the display area when no image is displayed, achieving a seamless black aesthetic, black light-blocking material is placed in the non-display area under the cover glass.

[0004] Currently, the main method for setting black light-shielding material in the non-display area under the glass cover is a fixed light-shielding block, which is made of the same material as the cover glass. However, the angle of natural outdoor light shining on the screen varies at different times of day, resulting in uneven black display between the display and non-display areas, affecting the overall black effect. In addition, the light-shielding block can easily cause the overall screen temperature to rise after absorbing red ultraviolet rays, which may damage the components inside the screen. Summary of the Invention

[0005] Therefore, the purpose of this invention is to provide an integrated black adjustment system and method for screens to solve the technical problems existing in the prior art.

[0006] This invention provides a screen black adjustment system for adjusting the black display effect of an outdoor screen, comprising:

[0007] A backlight assembly, wherein the light-emitting end of the backlight assembly is provided with a black cover glass, and the side of the cover glass near the light-emitting end of the backlight assembly is provided with a display area and a non-display area;

[0008] The display panel is disposed within the display area;

[0009] A bonding block is disposed within the non-display area and surrounds the outside of the display panel. The bonding block is hollow and has an injection port and an outlet.

[0010] A light-collecting component is used to collect natural light to obtain the direction of natural light illumination relative to the screen.

[0011] An injection assembly, which is connected to the injection port, is used to inject filling ink into the bonding block;

[0012] The controller, which is communicatively connected to both the light-collecting component and the injection component, is used to control the type and injection parameters of the filling ink injected into the bonding block by the injection component according to the direction of the natural light.

[0013] The filling inks include filling inks with different metal oxide concentrations. Filling inks with higher metal oxide concentrations have a greater absorption effect on red ultraviolet rays in natural light than filling inks with lower metal oxide concentrations, so as to adjust the light absorption effect of the bonding block according to the direction of natural light irradiation.

[0014] A heat dissipation component is connected to the outlet and is used to dissipate heat from the filling ink flowing out of the bonding block.

[0015] Preferably, the display panel and the cover glass are bonded together by OCA.

[0016] Preferably, the bonding block includes an outer shell, the outer shell having a cavity for accommodating the filling ink, and the outer shell being bonded to the glass cover via OCA.

[0017] Preferably, the bonding blocks surrounding the outside of the display panel include an upper bonding block, a lower bonding block, a left bonding block, and a right bonding block, each of which is provided with an injection port and an outlet port to realize the injection and outflow of filling ink.

[0018] Preferably, the filling ink comprises at least a first component and a second component;

[0019] The first component is composed of the following components by weight: 50-52 parts of epoxy black ink for glass screen printing, 10-18 parts of epoxy white ink for glass screen printing, 16-20 parts of epoxy red and yellow ink for glass screen printing, 8-10 parts of epoxy tackifier for glass screen printing, and 7-9 parts of epoxy diluent for glass screen printing.

[0020] The second component is a curing agent, which is divided into 10-15 parts by weight.

[0021] Preferably, the filling ink further includes a flow aid, which is used to improve the flowability of the filling ink, and the flow aid is black powder or polyvinylamide.

[0022] Preferably, the outlet of the heat dissipation component is connected to the inlet of the injection component. The filling ink, after being cooled by the heat dissipation component, flows back into the injection component and is then injected into the bonding block through the injection component to adjust the screen to a uniform black, so that the filling ink circulates within the system.

[0023] Preferably, the metal oxide includes at least aluminum oxide and tungsten oxide.

[0024] The beneficial effects of this invention are as follows: The integrated black adjustment system provided by this invention can collect the current natural light irradiation direction in real time through the light acquisition component. The controller controls the injection parameters of the filling ink injected into the bonding block based on the natural light irradiation direction. The injection parameters include, but are not limited to, inks with different metal oxide concentrations, injection pressure, injection temperature, injection time, etc., so that the bonding block can adaptively inject inks with corresponding metal oxide concentrations according to different natural light irradiation directions, automatically adjusting the red and ultraviolet absorption capacity of the non-display area, thereby adjusting the integrated black display effect under different lighting environments; the degree of integrated black is higher; furthermore, the outlet of the bonding block is connected to the heat dissipation component, and the flowing filling ink has the effect of quickly carrying away the absorbed red and ultraviolet energy, which can effectively cool the screen and its surrounding components, making it suitable for widespread application.

[0025] The present invention also provides a method for adjusting the screen to a unified black level using the above-described integrated black adjustment system, comprising the following steps:

[0026] Step 1: Obtain the current direction of natural light relative to the screen using the light acquisition component;

[0027] Step 2: After receiving the direction of natural light, the controller, which is communicatively connected to the light-emitting component, sends a control signal to the injection component. The control signal is used to control the parameters of the filling ink injected into the bonding block by the injection component.

[0028] Step 3: Inject filler ink with a first metal oxide concentration into the corresponding position of the bonding block near the direction of natural light irradiation through the injection port, and inject filler ink with a second metal oxide concentration into other positions of the bonding block, wherein the first metal oxide concentration is greater than the second metal oxide concentration;

[0029] Step four: The filling ink, after absorbing red ultraviolet light inside the bonding block, flows out from the outlet of the bonding block. The heat dissipation component connected to the outlet receives the filling ink and dissipates heat from it.

[0030] Preferably, the bonding block includes an upper bonding block, a lower bonding block, a left bonding block, and a right bonding block, each part being provided with an injection port and an outlet port to realize the injection and outflow of filling ink respectively;

[0031] Step three specifically includes:

[0032] When the direction of natural light is close to the upper part of the screen, filler ink with a first metal oxide concentration is injected into the injection port of the upper bonding block, and filler ink with a second metal oxide concentration is injected into the other bonding blocks.

[0033] When the direction of natural light is close to the upper left of the screen, filler ink with a first metal oxide concentration is injected into the injection ports of the upper bonding block and the left bonding block, and filler ink with a second metal oxide concentration is injected into the other bonding blocks.

[0034] When the direction of natural light is perpendicular to the surface of the screen, filler ink with a second metal oxide concentration is injected into the injection ports of the upper bonding block, the lower bonding block, the left bonding block, and the right bonding block.

[0035] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0036] Figure 1 This is a schematic diagram of the integrated black adjustment system for the screen in Embodiment 1 of the present invention;

[0037] Figure 2 This is a flowchart of the screen-integrated black adjustment method in Embodiment 2 of the present invention.

[0038] Explanation of key component symbols:

[0039] 10. Backlight assembly; 11. Cover glass; 12. Display panel; 13. Bonding block; 14. Light collection assembly; 15. Injection assembly; 16. Controller; 17. Controller.

[0040] The following detailed description, in conjunction with the accompanying drawings, will further illustrate the present invention. Detailed Implementation

[0041] To facilitate understanding of the present invention, a more complete description will be given below with reference to the accompanying drawings. Several embodiments of the invention are illustrated in the drawings. However, the invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

[0042] It should be noted that when a component is said to be "fixed to" another component, it can be directly on the other component or there may be an intervening component. When a component is said to be "connected to" another component, it can be directly connected to the other component or there may be an intervening component. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0043] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0044] Example 1

[0045] Specifically, such as Figure 1 As shown, in this embodiment of the invention, a screen integrated black adjustment system is provided for adjusting the integrated black display effect of an outdoor screen. It is particularly suitable for outdoor advertising screens, large vertical advertising screens, and especially borderless high-end vertical advertising screens. Specifically, the screen integrated black adjustment system includes:

[0046] The backlight assembly 10 has a black cover glass 11 at its light-emitting end. The cover glass 11 has a display area and a non-display area on the side near the light-emitting end of the backlight assembly 10.

[0047] Display panel 12 is located within the display area;

[0048] The bonding block 13 is located in the non-display area and surrounds the outside of the display panel 12. The bonding block 13 is a hollow bonding block and has an injection port and an outlet.

[0049] Light acquisition component 14 is used to acquire natural light to obtain the direction of natural light relative to the screen.

[0050] Injection assembly 15 is connected to the injection port of bonding block 13 and is used to inject filling ink into bonding block 13.

[0051] The controller 16 is communicatively connected to the light acquisition component 14 and the injection component 15, respectively, and is used to control the type and injection parameters of the filling ink injected into the bonding block by the injection component 15 according to the direction of natural light.

[0052] The filling inks include filling inks with different metal oxide concentrations. Filling inks with higher metal oxide concentrations have a greater absorption effect on red ultraviolet rays in natural light than filling inks with lower metal oxide concentrations, so as to adjust the light absorption effect of the bonding block according to the direction of natural light irradiation.

[0053] Heat dissipation component 17 is connected to the outlet of bonding block 13 and is used to dissipate heat from the filling ink flowing out of bonding block 13.

[0054] Optionally, in this embodiment, the backlight assembly 10 is arranged inside the screen, and the light-emitting end of the backlight assembly 10 is provided with a black cover glass 11; a display area and a non-display area are provided between the backlight assembly 10 and the cover glass, and the coverage area of ​​the cover glass 11 is larger than the liquid crystal display area, with the part exceeding the cover glass being the non-display area. That is, the display area is located at the center of the backlight assembly, and the non-display area is located outside the display area. A display panel 12 is provided within the display area, and the display panel 12 is higher than the surface of the backlight assembly 10; Optionally, the display panel 12 and the cover glass 11 can be bonded by OCA (Optically Clear Adhesive). OCA optical adhesive has a light transmittance of over 95%, good bonding strength, can be cured at room temperature or medium temperature, and has the characteristics of low curing shrinkage.

[0055] Metal oxides are added to the glass cover plate 11, and the metal oxides added to the filling ink can be the same as those filled in the glass cover plate. An adhesive block 13 is provided on the side of the non-display area of ​​the glass cover plate 11 closest to the display area. The shape of the adhesive block 13 matches the non-display area and is tightly close to the display area without gaps. The adhesive block 13 is a hollow block with an internal space and an outer shell. The outer shell has a cavity for accommodating the filling ink, and the outer shell can also be bonded to the glass cover plate using OCA. Optionally, the outer shell itself can be made of a transparent material, such as transparent acrylic. In other optional embodiments, the outer shell can also be made black by mixing a colored material into the raw material to achieve the initial purpose of a black non-display area. The colored material is, for example, melanin, preferably carbon black, graphene, or other materials with additional red ultraviolet absorption properties.

[0056] Optionally, the bonding block has at least one injection port and one outlet, both of which communicate with the internal space. The light acquisition component 14 can be a light acquisition camera, which can be integrated into the host unit assembled with the display screen, such as the camera integrated into a high-end outdoor smart advertising machine. It is used to collect the direction of natural light relative to the screen. The injection component 15 is connected to the injection port, and the controller 16 is communicatively connected to the injection component 15 and the light acquisition component 14 respectively. The controller 16 controls the injection parameters of the filling ink injected into the bonding block 13 by the injection component 15 based on the direction of natural light. The filling ink is a black substance, preferably liquid or viscous fluid, which makes the bonding block appear black after injection. The filling ink contains metal oxides, which can absorb the red ultraviolet rays in natural light, effectively reducing the radiation temperature rise caused by red ultraviolet rays. On the one hand, it prevents the high temperature from affecting the internal components, and on the other hand, it can effectively prevent the high temperature from affecting the black pigment in the ink. The black pigment may decompose faster under the influence of high temperature or red ultraviolet rays, affecting the absorption of natural light and thus affecting the display effect of the integrated black.

[0057] The heat dissipation component 17 is connected to the outlet of the bonding block 13 and has a heat dissipation channel inside for dissipating heat from the filling ink flowing out of the bonding block.

[0058] The integrated black adjustment system provided in this application can collect the current natural light irradiation direction in real time through the light acquisition component. The controller controls the injection parameters of the filling ink injected into the bonding block 13 by the injection component 15 based on the natural light irradiation direction. The injection parameters include, but are not limited to, inks with different metal oxide concentrations, injection pressure, injection temperature, injection time, etc., so that the bonding block can adaptively inject inks with corresponding metal oxide concentrations according to different natural light irradiation directions, automatically adjust the red and ultraviolet absorption capacity of the non-display area, thereby adjusting the integrated black display effect under different lighting environments; the integrated black level is higher; furthermore, the outlet of the bonding block 13 is connected to the heat dissipation component, and the flowing filling ink has the effect of quickly carrying away the absorbed red and ultraviolet energy, which can effectively cool the screen and its surrounding components.

[0059] Optionally, in this embodiment, the bonding blocks surrounding the outside of the display panel 12 include an upper bonding block, a lower bonding block, a left bonding block, and a right bonding block. Each part is provided with an injection port and an outlet to realize the injection and outflow of filling ink. The filling ink in the bonding blocks at different positions can be controlled individually. The filling ink includes at least a first component and a second component. The first component is composed of the following components by weight: 50-52 parts of epoxy black ink for glass screen printing, 10-18 parts of epoxy white ink for glass screen printing, 16-20 parts of epoxy red-yellow ink for glass screen printing, 8-10 parts of epoxy tackifier for glass screen printing, and 7-9 parts of epoxy diluent for glass screen printing. The second component is a curing agent, composed of 10-15 parts by weight. In some optional embodiments, the filling ink also includes a flow aid, which is used to improve the flowability of the filling ink. The flow aid is black powder or polyvinylamide.

[0060] Optionally, in this embodiment, the outlet of the heat dissipation component 17 is connected to the inlet of the injection component 15. For example, they can be connected by a dual-channel pipe. The filling ink, after being cooled by the heat dissipation component 17, flows back into the injection component 15 and is then injected into the bonding block 13 through the injection component 17 for integrated black adjustment of the screen, so that the filling ink circulates within the system. The metal oxide includes at least aluminum oxide and tungsten oxide. In some optional embodiments, the metal oxide may also include a mixture of titanium oxide, vanadium oxide, iron oxide, cobalt oxide, etc.

[0061] Optionally, in this embodiment, the ability of the metal oxide in the filler to absorb red ultraviolet light is positively correlated with its concentration. The residual energy of the red ultraviolet light applied to the screen per unit area after absorption is reflected to form the red-green and yellow-blue light values ​​displayed in that part. These two values, along with the brightness, are used as the basis for judging the integrated black visual effect. The specific calculation formula is as follows: The L value represents brightness, the a value represents red-green, and the b value represents yellow-blue. A smaller ΔE indicates a better overall black visual effect; less than 1 indicates a good overall black visual effect. The brightness, red-green, and yellow-blue values ​​of the display and non-display areas are collected separately, and the difference is calculated to obtain ΔE. This means that the overall black visual effect is a comparative value. Therefore, this solution can automatically adjust the absorption capacity of the non-display area as outdoor lighting changes with the angle of sunlight, thereby achieving a better overall black visual effect.

[0062] Furthermore, for outdoor displays in fixed locations, the angle of natural light illumination is relatively fixed each day over a longer period of time (monthly or quarterly). Therefore, the processor can collect the angle of natural light illumination only once within the planned period based on the monthly or quarterly collection plan, and use the control scheme of each injection component in a fixed manner within that period, which helps to save data processing energy consumption and costs.

[0063] Example 2

[0064] This embodiment provides a method for adjusting the screen to a unified black level using the integrated black adjustment system in Embodiment 1, such as... Figure 2 As shown, it includes the following steps:

[0065] Step 1: Obtain the current direction of natural light relative to the screen using the light acquisition component;

[0066] Step 2: After receiving the direction of natural light, the controller, which is communicatively connected to the light-emitting component, sends a control signal to the injection component. The control signal is used to control the injection parameters of the filling ink injected into the bonding block by the injection component.

[0067] Step 3: Inject filler ink with a first metal oxide concentration into the corresponding position of the bonding block near the direction of natural light irradiation through the injection port, and inject filler ink with a second metal oxide concentration into other positions of the bonding block, wherein the first metal oxide concentration is greater than the second metal oxide concentration;

[0068] Step four: The filling ink, after absorbing red ultraviolet light inside the bonding block, flows out from the outlet of the bonding block. The heat dissipation component connected to the outlet receives the filling ink and dissipates heat from it.

[0069] Optionally, in this embodiment, the bonding block includes an upper bonding block, a lower bonding block, a left bonding block, and a right bonding block, each part being provided with an injection port and an outlet port to realize the injection and outflow of filling ink respectively;

[0070] Step three specifically includes:

[0071] When the direction of natural light is close to the upper part of the screen, filler ink with a first metal oxide concentration is injected into the injection port of the upper bonding block, and filler ink with a second metal oxide concentration is injected into the other bonding blocks. Optionally, when the direction of natural light is close to the upper part of the bonding block, it means that the light intensity of the upper part of the bonding block is stronger than that of the other parts. Therefore, the concentration of metal oxide in the filler ink injected into the upper bonding block should be greater than the concentration of metal oxide in the filler ink of the other three parts. This is to improve the absorption of red ultraviolet rays by the upper bonding block, reduce the irradiation temperature rise at the upper bonding block position, and thus achieve a black display effect of the screen as a whole.

[0072] When the direction of natural light is close to the upper left of the screen, filler ink with a first metal oxide concentration is injected into the injection ports of the upper and left bonding blocks, and filler ink with a second metal oxide concentration is injected into the other bonding blocks; similarly, when the direction of natural light is close to the upper left of the bonding blocks, it means that the light intensity in the upper left of the screen is stronger, and filler ink with a higher metal oxide concentration is injected accordingly.

[0073] When the direction of natural light is perpendicular to the surface of the screen, filler ink with a second metal oxide concentration is injected into the injection ports of the upper bonding block, lower bonding block, left bonding block, and right bonding block.

[0074] It should be noted that the above implementation process is only to illustrate the feasibility of this application, but it does not mean that the integrated black adjustment system and method of this application are limited to the above implementation processes. On the contrary, as long as the integrated black adjustment system and method of this application can be implemented, they can be included in the feasible implementation scheme of this application.

[0075] In the description of this specification, references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0076] The above embodiments merely illustrate several implementation methods of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this patent should be determined by the appended claims.

Claims

1. A screen integrated black adjustment system for adjusting the integrated black display effect of an outdoor screen, characterized in that, The integrated black adjustment system for the screen includes: A backlight assembly, wherein the light-emitting end of the backlight assembly is provided with a black cover glass, and the side of the cover glass near the light-emitting end of the backlight assembly is provided with a display area and a non-display area; The display panel is disposed within the display area; A bonding block is disposed within the non-display area and surrounds the outside of the display panel. The bonding block is hollow and has an injection port and an outlet. A light-collecting component is used to collect natural light to obtain the direction of natural light illumination relative to the screen. An injection assembly, which is connected to the injection port, is used to inject filling ink into the bonding block; The controller is communicatively connected to both the light acquisition component and the injection component, and is used to control the type and injection parameters of the filling ink injected into the bonding block by the injection component according to the direction of the natural light. The filling inks include filling inks with different metal oxide concentrations. Filling inks with higher metal oxide concentrations have a greater absorption effect on red ultraviolet rays in natural light than filling inks with lower metal oxide concentrations, so as to adjust the light absorption effect of the bonding block according to the direction of natural light irradiation. A heat dissipation component is connected to the outlet and is used to dissipate heat from the filling ink flowing out of the bonding block.

2. The integrated black adjustment system for the screen according to claim 1, characterized in that, The display panel and the cover glass are bonded together using OCA.

3. The integrated black adjustment system for the screen according to claim 1, characterized in that, The bonding block includes an outer shell, and the outer shell has a cavity for accommodating the filling ink. The outer shell is bonded to the cover glass via OCA.

4. The integrated black adjustment system for the screen according to claim 1, characterized in that, The bonding blocks surrounding the outside of the display panel include an upper bonding block, a lower bonding block, a left bonding block, and a right bonding block. Each part is provided with an injection port and an outlet to realize the injection and outflow of filling ink.

5. The integrated black adjustment system for the screen according to claim 1, characterized in that, The filling ink includes at least a first component and a second component; The first component is composed of the following components by weight: 50-52 parts of epoxy black ink for glass screen printing, 10-18 parts of epoxy white ink for glass screen printing, 16-20 parts of epoxy red and yellow ink for glass screen printing, 8-10 parts of epoxy tackifier for glass screen printing, and 7-9 parts of epoxy diluent for glass screen printing. The second component is a curing agent, which is divided into 10-15 parts by weight.

6. The integrated black adjustment system for the screen according to claim 5, characterized in that, The filling ink also includes a flow aid, which is used to improve the flowability of the filling ink. The flow aid is black powder or polyvinylamide.

7. The integrated black adjustment system for the screen according to claim 1, characterized in that, The outlet of the heat dissipation component is connected to the inlet of the injection component. The filling ink, after being cooled by the heat dissipation component, flows back into the injection component and is then injected into the bonding block through the injection component to adjust the screen to a uniform black, so that the filling ink circulates within the system.

8. The integrated black adjustment system for the screen according to claim 1, characterized in that, The metal oxide includes at least aluminum oxide and tungsten oxide.

9. A method for adjusting the integrated black level of a screen using the integrated black leveling system according to any one of claims 1-8, characterized in that, Includes the following steps: Step 1: Obtain the current direction of natural light relative to the screen using the light acquisition component; Step 2: After receiving the direction of natural light, the controller, which is communicatively connected to the light acquisition component, sends a control signal to the injection component. The control signal is used to control the parameters of the filling ink injected into the bonding block by the injection component. Step 3: Inject filler ink with a first metal oxide concentration into the corresponding position of the bonding block near the direction of natural light irradiation through the injection port, and inject filler ink with a second metal oxide concentration into other positions of the bonding block, wherein the first metal oxide concentration is greater than the second metal oxide concentration; Step four: The filling ink, after absorbing red ultraviolet light inside the bonding block, flows out from the outlet of the bonding block. The heat dissipation component connected to the outlet receives the filling ink and dissipates heat from it.

10. The screen integrated black adjustment method according to claim 9, characterized in that, The bonding block includes an upper bonding block, a lower bonding block, a left bonding block, and a right bonding block. Each part is provided with an injection port and an outlet to realize the injection and outflow of filling ink. Step three specifically includes: When the direction of natural light is close to the upper part of the screen, filler ink with a first metal oxide concentration is injected into the injection port of the upper bonding block, and filler ink with a second metal oxide concentration is injected into the other bonding blocks. When the direction of natural light is close to the upper left of the screen, filler ink with a first metal oxide concentration is injected into the injection ports of the upper bonding block and the left bonding block, and filler ink with a second metal oxide concentration is injected into the other bonding blocks. When the direction of natural light is perpendicular to the surface of the screen, filler ink with a second metal oxide concentration is injected into the injection ports of the upper bonding block, the lower bonding block, the left bonding block, and the right bonding block.

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