Liquid crystal display screen capable of automatically adjusting brightness
By integrating the photosensitive sensing circuit on the lower substrate of the TFT liquid crystal display, sensing the brightness of the environment and adjusting the brightness of the backlight, the problem of increasing the cost of adding automatic dimming function in the prior art is solved, and low-cost automatic brightness adjustment is achieved, improving the The competitiveness of the product.
Patent Information
- Application Number
- CN202323639512.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2023-12-28
- Publication Date
- 2025-01-14
- Estimated Expiration
- 2033-12-28
AI Technical Summary
When the existing TFT LCD screens add automatic dimming function, they need to add light-sensitive IC circuits to the motherboard circuit or display FPC, resulting in an increase in production costs and reducing the competitiveness of the product.
Design a liquid crystal display that can automatically adjust brightness. By integrating a photosensitive sensing circuit on the lower substrate and electrically connected to the driver IC or motherboard main control chip, it induces the brightness of the environment and converts it into a PWM signal to send it to the backlight module to achieve brightness. Adjust, eliminating the photosensitive IC circuit.
It realizes the automatic brightness adjustment function to increase at the lowest cost, reduces production costs and improves the market competitiveness of the product.
Smart Images
Figure CN222354703U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of liquid crystal display, and more specifically to a liquid crystal display screen capable of automatically adjusting brightness. Background Art
[0002] TFT LCD screens are widely used in many fields. Through TFT LCD screens, information can be expressed more intuitively and vividly. In the industrial or consumer fields, in addition to the traditional products using TFT LCD screens, such as monitors, telephones, handheld scanners, cameras, etc., many devices that did not use TFT LCD screens before are now also beginning to use TFT LCD screens, such as remote controls, ovens, refrigerators, etc.
[0003] Nowadays, many TFT LCD screen manufacturers and module manufacturers are competing in the market, and customers have higher and higher requirements for the display specifications of TFT modules. Many products have automatic dimming functions, which can automatically adjust the brightness of the display according to the brightness of the environment, but they all need to add light-sensing IC circuits on the motherboard circuit or the display FPC, which increases the production cost of LCD screens and reduces the competitiveness of products. Utility Model Content
[0004] The technical problem to be solved by the utility model is how to add the automatic brightness adjustment function under the condition of the lowest cost.
[0005] The technical problem to be solved by the utility model is achieved through the following technical solutions:
[0006] In order to solve the above technical problems, the utility model provides a liquid crystal display screen with automatic brightness adjustment, which includes a backlight module, a lower polarizer, a lower substrate, an upper substrate, an upper polarizer and a cover plate which are stacked in sequence from bottom to top, the lower substrate is longer than the upper substrate and extends outward to form a step, the upper surface of the lower substrate located at the step is bound with a driver IC and an FPC, the upper surface of the lower substrate is provided with a photosensitive sensor circuit, the photosensitive sensor circuit is electrically connected to the driver IC or the main control chip of the main board, the photosensitive sensor circuit can sense the ambient brightness, and convert the sensed ambient brightness into an electrical signal and send it to the driver IC or the main control chip of the main board, the driver IC or the main control chip of the main board converts the received signal into a PWM signal and sends it to the backlight module, and the backlight module adjusts the backlight brightness according to the PWM signal.
[0007] As a preferred embodiment of the liquid crystal display screen with automatic brightness adjustment provided by the utility model, a protrusion is provided on the edge of the upper surface of the lower substrate extending outward, and a buffer glue is provided on the upper surface of the lower substrate between the protrusion and the upper substrate, and the buffer glue abuts against the cover plate.
[0008] As a preferred implementation of the liquid crystal display screen capable of automatically adjusting brightness provided by the utility model, the upper surface of the protrusion is flush with the upper surface of the upper substrate.
[0009] As a preferred implementation of the liquid crystal display screen capable of automatically adjusting brightness provided by the utility model, the buffer glue is silicone glue.
[0010] As a preferred implementation of the liquid crystal display screen capable of automatically adjusting brightness provided by the utility model, a rounded corner is arranged between the protrusion and the lower substrate.
[0011] As a preferred implementation of the liquid crystal display screen capable of automatically adjusting brightness provided by the utility model, the upper surface of the lower substrate and the side surfaces of the protrusion are rough surfaces.
[0012] As a preferred embodiment of the liquid crystal display screen capable of automatically adjusting brightness provided by the utility model, the FPC includes a substrate layer, a circuit layer arranged on the upper surface of the substrate layer, and a metal heat dissipation layer arranged on the lower surface of the substrate layer.
[0013] As a preferred embodiment of the liquid crystal display screen with automatic brightness adjustment provided by the utility model, the FPC also includes at least one through-hole penetrating the substrate layer, the circuit layer and the metal heat dissipation layer, and the inner wall of the through-hole is provided with a thermal conductive layer in contact with the circuit layer and the metal heat dissipation layer.
[0014] As a preferred implementation of the liquid crystal display screen capable of automatically adjusting brightness provided by the utility model, a heat conductor connected to an external heat-conducting structure is arranged in the through hole, and the heat conductor is in contact with the heat-conducting layer.
[0015] As a preferred implementation of the liquid crystal display screen capable of automatically adjusting brightness provided by the utility model, the structure of the metal heat dissipation layer is a mesh structure, a strip structure, a wavy structure or a honeycomb structure.
[0016] The utility model has the following beneficial effects:
[0017] Since the photosensitive sensor circuit is integrated on the upper surface of the lower substrate, the photosensitive sensor circuit can be electrically connected to the driver IC or the main control chip of the main board. The driver IC or the main control chip of the main board sends the brightness information sensed by the photosensitive sensor circuit to the backlight module, thereby achieving the effect of automatically adjusting the backlight brightness according to the ambient brightness. It can eliminate the photosensitive IC circuit, and the overall cost is more advantageous and more competitive in the market. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] In order to more clearly illustrate the scheme in the present application, a brief introduction is given below to the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.
[0019] Figure 1 The utility model provides a schematic structural diagram of a liquid crystal display screen capable of automatically adjusting brightness.
[0020] Figure 2 This is a schematic diagram of the structure of Example 2.
[0021] Figure 3 This is a schematic diagram of the structure of Example 3.
[0022] Description of Figure Numbers:
[0023] Backlight module 1; lower polarizer 2; lower substrate 3; upper substrate 4; upper polarizer 5; cover plate 6; driver IC 7; FPC 8; photosensitive sensor circuit 9;
[0024] Protrusion 31; Buffer rubber 32;
[0025] Base material layer 81; circuit layer 82; metal heat dissipation layer 83; through hole 84. DETAILED DESCRIPTION
[0026] In order to enable those skilled in the art to better understand the solution of the utility model, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is only a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the utility model.
[0027] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.
[0028] In addition, the terms "first", "second", and "third" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first", "second", and "third" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.
[0029] The utility model provides a liquid crystal display screen capable of automatically adjusting brightness, comprising a backlight module, a lower polarizer, a lower substrate, an upper substrate, an upper polarizer and a cover plate which are sequentially stacked from bottom to top, wherein the lower substrate is longer than the upper substrate and extends outward to form a step, a driver IC and an FPC are bound to the upper surface of the lower substrate located at the step, a photosensitive sensor circuit is arranged on the upper surface of the lower substrate, the photosensitive sensor circuit is electrically connected to the driver IC or a main control chip of a main board, the photosensitive sensor circuit can sense ambient brightness, and convert the sensed ambient brightness into an electrical signal and send it to the driver IC or the main control chip of the main board, the driver IC or the main control chip of the main board converts the received signal into a PWM signal and sends it to the backlight module, and the backlight module adjusts the backlight brightness according to the PWM signal.
[0030] Since the photosensitive sensor circuit is integrated on the upper surface of the lower substrate, the photosensitive sensor circuit can be electrically connected to the driver IC or the main control chip of the main board. The driver IC or the main control chip of the main board sends the brightness information sensed by the photosensitive sensor circuit to the backlight module, thereby achieving the effect of automatically adjusting the backlight brightness according to the ambient brightness. It can eliminate the photosensitive IC circuit, and the overall cost is more advantageous and more competitive in the market.
[0031] In order to enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings. The present invention is described in detail below in conjunction with the accompanying drawings and embodiments, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements with the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limitations on the present invention.
[0032] Example 1
[0033] See also Figure 1, a liquid crystal display screen with automatic brightness adjustment provided by the utility model, comprising a backlight module 1, a lower polarizer 2, a lower substrate 3, an upper substrate 4, an upper polarizer 5 and a cover plate 6 which are sequentially stacked from bottom to top, the lower substrate 3 is longer than the upper substrate 4 and extends outward to form a step, the upper surface of the lower substrate 3 located at the step is bound with a driver IC 7 and an FPC 8, a photosensitive sensor circuit 9 is arranged on the upper surface of the lower substrate 3, the photosensitive sensor circuit 9 is electrically connected to the driver IC 7 or the main control chip of the main board, the photosensitive sensor circuit 9 can sense the ambient brightness, and convert the sensed ambient brightness into an electrical signal and send it to the driver IC 7 or the main control chip of the main board, the driver IC 7 or the main control chip of the main board converts the received signal into a PWM signal and sends it to the backlight module 1, and the backlight module 1 adjusts the backlight brightness according to the PWM signal.
[0034] Example 2
[0035] See also Figure 2 As a further optimization scheme of Example 1, in this embodiment, the lower substrate 3 is longer than the upper substrate 4 and extends outward, and a protrusion 31 is provided on the edge of the upper surface of the lower substrate 3 extending outward, and a buffer glue 32 is provided on the upper surface of the lower substrate 3 between the protrusion 31 and the upper substrate 4, and the buffer glue 32 abuts against the cover plate 6. Since the edge of the lower substrate 3 is provided with a protrusion 31, the protrusion 31 can limit the flow of the buffer glue 32, so that the shape of the buffer glue 32 is easy to control, and there will be no overflow of glue or incomplete glue dispensing. Thereby preventing the LCD screen from being unable to be assembled with the casing. In addition, the problem of poor buffering effect caused by incomplete glue dispensing and easy rupture of the lower substrate 3 is avoided, and the LCD screen is prevented from displaying abnormally.
[0036] Furthermore, the upper surface of the protrusion 31 is flush with the upper surface of the upper substrate 4 to further limit the flow of the buffer glue 32, so that the shape of the buffer glue 32 is easy to control without overflowing glue or incomplete glue dispensing.
[0037] Furthermore, the buffer glue 32 is silicone glue.
[0038] Furthermore, a chamfer is provided between the protrusion 31 and the lower substrate 3 so that the buffer glue 32 can more easily fill the space between the protrusion 31 on the upper surface of the lower substrate 3 and the upper substrate 4. The protrusion 31 with a chamfer can make the buffer glue 32 flow more smoothly into the space between the protrusion 31 on the upper surface of the lower substrate 3 and the upper substrate 4, making it less likely for bubbles to appear.
[0039] Furthermore, the upper surface of the lower substrate 3 and the side surfaces of the protrusions 31 are rough surfaces to improve the fixing effect of the buffer glue 32 .
[0040] Furthermore, the rough surface is a frosted surface or a diamond knurling surface to further improve the fixing effect of the buffer glue 32 .
[0041] Example 3
[0042] See also Figure 3 As a further optimization scheme of Example 1, in this embodiment, the FPC8 includes a substrate layer 81, a circuit layer 82 arranged on the upper surface of the substrate layer 81, and a metal heat dissipation layer 83 arranged on the lower surface of the substrate layer 81. The arrangement method can be that the circuit layer 82 and the metal heat dissipation layer 83 are respectively attached to the substrate layer 81 by double-sided adhesive. Since the thickness of the substrate layer 81 is relatively thin, the heat on the FPC8 can be diffused to the metal heat dissipation layer 83 through the substrate layer 81. The metal heat dissipation layer 83 can effectively increase the heat dissipation area of the FPC8 and play a role in uniform heat dissipation, thereby improving the heat dissipation efficiency of the FPC8. The substrate layer 81 can be any one of polyimide, polyester, polysulfone or polytetrafluoroethylene, the double-sided adhesive is any one of an acrylic adhesive layer or an epoxy resin adhesive layer, and the metal heat dissipation layer 83 can be a copper foil layer.
[0043] Furthermore, the FPC 8 also includes at least one through-hole 84 penetrating the substrate layer 81, the circuit layer 82 and the metal heat dissipation layer 83, and the inner wall of the through-hole 84 is provided with a heat-conducting layer in contact with the circuit layer 82 and the metal heat dissipation layer 83. By utilizing the good thermal conductivity of the through-hole 84, the circuit layer 82 and the metal heat dissipation layer 83 on both sides of the substrate layer 81 can be electrically connected to play a good thermal conductivity function, and the thermal conductive layer can provide a thermal conductive function to achieve a good heat dissipation effect. Among them, the thermal conductive layer can be a copper glue conductive ink layer.
[0044] Furthermore, a heat conductor connected to an external heat-conducting structure is disposed in the through-hole 84. The heat conductor is connected to the external heat-conducting structure from one side of the circuit layer 82 and is also in contact with the heat-conducting layer in the through-hole 84, so that the circuit layer 82 and the metal heat-dissipating layer 83 can be connected to the external heat-conducting structure through the through-hole 84, so that the heat in the FPC 8 is diffused to the external heat-conducting structure through the heat conductor in the through-hole 84, so as to further improve the heat dissipation efficiency of the FPC 8. Preferably, in order to enable the through-hole 84 to be connected to the external heat-conducting structure, the through-hole 84 is disposed at the edge of the FPC 8.
[0045] Furthermore, the metal heat dissipation layer 83 is a uniform heat dissipation structure, and its structure can be any one of a mesh structure, a strip structure, a wavy structure or a honeycomb structure. Through this uniform heat dissipation structure, the heat dissipation effect can be better improved.
[0046] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.
[0047] Obviously, the embodiments described above are only some embodiments of the present application, rather than all embodiments. The preferred embodiments of the present application are given in the accompanying drawings, but they do not limit the patent scope of the present application. The present application can be implemented in many different forms. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present application more thorough and comprehensive. Although the present application is described in detail with reference to the aforementioned embodiments, for those skilled in the art, it is still possible to modify the technical solutions recorded in the aforementioned specific implementation methods, or to perform equivalent replacement of some of the technical features therein. Any equivalent structure made using the contents of the specification and drawings of this application, directly or indirectly used in other related technical fields, is similarly within the scope of patent protection of this application.
Claims
1. A liquid crystal display screen capable of automatically adjusting brightness, characterized in that: It includes a backlight module, a lower polarizer, a lower substrate, an upper substrate, an upper polarizer and a cover plate which are stacked in sequence from bottom to top. The lower substrate is longer than the upper substrate and extends outward to form a step. The upper surface of the lower substrate located at the step is bound with a driver IC and an FPC. The upper surface of the lower substrate is provided with a photosensitive sensor circuit, which is electrically connected to the driver IC or the main control chip of the main board. The photosensitive sensor circuit can sense the ambient brightness and convert the sensed ambient brightness into an electrical signal and send it to the driver IC or the main control chip of the main board. The driver IC or the main control chip of the main board converts the received signal into a PWM signal and sends it to the backlight module. The backlight module adjusts the backlight brightness according to the PWM signal.
2. The liquid crystal display screen capable of automatically adjusting brightness according to claim 1, characterized in that: A protrusion is arranged on the edge of the upper surface of the lower substrate extending outward, and a buffer glue is arranged on the upper surface of the lower substrate between the protrusion and the upper substrate, and the buffer glue abuts against the cover plate.
3. The liquid crystal display screen capable of automatically adjusting brightness according to claim 2, characterized in that: An upper surface of the protrusion is flush with an upper surface of the upper substrate.
4. The liquid crystal display screen capable of automatically adjusting brightness according to claim 2, characterized in that: The buffer glue is silicone glue.
5. The liquid crystal display screen capable of automatically adjusting brightness according to claim 2, characterized in that: A rounded corner is arranged between the protrusion and the lower substrate.
6. The liquid crystal display screen capable of automatically adjusting brightness according to claim 2, characterized in that: The upper surface of the lower substrate and the side surfaces of the protrusion are rough surfaces.
7. The liquid crystal display screen capable of automatically adjusting brightness according to claim 1, characterized in that: The FPC includes a substrate layer, a circuit layer disposed on an upper surface of the substrate layer, and a metal heat dissipation layer disposed on a lower surface of the substrate layer.
8. The liquid crystal display screen capable of automatically adjusting brightness according to claim 7, characterized in that: The FPC further includes at least one through-hole penetrating the substrate layer, the circuit layer and the metal heat dissipation layer, and an inner wall of the through-hole is provided with a heat-conducting layer in contact with the circuit layer and the metal heat dissipation layer.
9. The liquid crystal display screen capable of automatically adjusting brightness according to claim 8, characterized in that: A heat conductor connected to an external heat-conducting structure is arranged in the through hole, and the heat conductor is in contact with the heat-conducting layer.