Combined liquid crystal display

Abstract

The utility model is applicable to the field of liquid crystal displays, and provides a combined liquid crystal display, which comprises a black-white screen, a black-white screen, a black-white screen surface polarizer, a black-white screen bottom polarizer, a black-white screen top polarizer, a black-white screen top polarizer, a black-white screen bottom polarizer, a black-white screen top polarizer and a black-white screen bottom polarizer, and is characterized in that the black-white screen is provided with a stroke segment pattern display area and an electrode-free area; the black and white screen bottom polaroid does not cover an electrode-free area; and the TFT screen is pasted on the outer surface of the bottom glass of the black and white screen and directly faces the non-electrode area, so that an image displayed by the TFT screen can be seen through the non-electrode area of the black and white screen, and a TFT display area is formed on the black and white screen. According to the combined liquid crystal display provided by the utility model, the black and white screen does not need to be pasted with a bottom polaroid at the position of the TFT display area, so that the product cost is greatly reduced. And the light transmittance of the TFT display area is improved by more than 50%, so that the brightness of the light source of the TFT screen can be greatly reduced on the premise of the same target light transmittance, and the heat dissipation and power consumption of the light source of the TFT screen are further reduced.

Description

Technical Field

[0001] The utility model belongs to the field of liquid crystal displays, and in particular relates to a combined liquid crystal display. Background Art

[0002] Early applications of in-vehicle display technology included central control panels and instrument clusters. These were small, low-resolution, and often featured intermittent or dot-matrix screens. With the advancement of intelligent, connected, and electrified vehicles, the demand for in-vehicle audio and navigation has increased, leading to a trend toward larger, higher-definition, multi-screen, and multi-touch displays.

[0003] At present, there is a kind of vehicle-mounted display screen that uses a triple-display combination of a black and white display screen and a TFT display screen, such as Figure 1 As shown, it specifically includes a large black and white screen 1 (also called a passively driven vertically aligned liquid crystal display) and a small TFT screen 2, which are bonded together using OCA glue 3 (Optically Clear Adhesive). A correspondingly sized area (called the ON-segment area) is created in the middle of the black and white screen 1, corresponding to the display area of ​​the TFT screen 2, to allow light transmitted from the TFT screen 2 to pass through. This ON-segment area can be switched between light-transmitting and light-impermeable under the control of the driver chip. A plan view of the entire combined liquid crystal display is shown below. Figure 2 As shown, it includes pen segment pattern display areas located in the middle and on both sides.

[0004] Figure 3 For the exploded view of the combined liquid crystal display, refer to Figure 3 From top to bottom, the black-and-white screen 1 comprises, in order, a black-and-white screen polarizer 11, a black-and-white screen top glass 12, a black-and-white screen bottom glass 13, a black-and-white screen bottom polarizer 14, and a black-and-white screen diffusion film 15. The black-and-white screen bottom polarizer 14 is a single polarizer, covering the entire bottom surface of the black-and-white screen bottom glass 13. The black-and-white screen diffusion film 15 consists of two small diffusion films, separated by a gap to prevent the light from the TFT screen 2 from exiting the light source. The TFT screen 2 comprises, from top to bottom, a TFT surface polarizer 21, a TFT screen top glass 22, a TFT screen bottom glass 23, and a TFT bottom polarizer 24. In addition, the combined liquid crystal display further includes a black and white screen backlight source 4 and a TFT backlight source 5, wherein the light emitting surface of the TFT backlight source 5 faces the TFT screen 2, and the light emitting surface of the black and white screen backlight source 4 faces the pen segment pattern display areas on both sides of the black and white screen 1, and the TFT surface polarizer 21 is perpendicular to the light absorption axis direction of the black and white screen surface polarizer 11, as shown in FIG. Figure 4 shown.

[0005] In addition, a black ink frame 16 is printed in the middle of the black and white screen bottom glass 13. Light transmitted by the TFT screen 2 will be emitted from the middle of the black ink frame 16 to the black and white screen 1. Black silicone rubber 7 is printed around the outer frame of the TFT screen 2 on the black and white screen bottom polarizer 14 to prevent light leakage.

[0006] In the above structure, for the image displayed in the TFT display area, its transmittance is equal to the transmittance of the black and white screen 1 plus the transmittance of the TFT screen 2, so that the overall transmittance is very low. Therefore, the light source of the display area of ​​the TFT screen 2 requires a higher brightness to compensate, and the heat dissipation and life requirements of the TFT backlight source 5 are very high. Utility Model Content

[0007] The technical problem to be solved by the present invention is how to make the surface brightness of the TFT screen and the black and white screen consistent with each other with a lower brightness of the TFT backlight source for a combined liquid crystal display, while also reducing the power consumption requirement and cost of the TFT screen.

[0008] To solve the above technical problems, the present invention is implemented as follows: a combined liquid crystal display comprising:

[0009] A black and white screen having a pen segment pattern display area and an electrodeless area, wherein a black and white screen surface polarizer is attached to the outer surface of the black and white screen's top glass, and a black and white screen bottom polarizer is attached to the outer surface of the black and white screen's bottom glass, and the black and white screen bottom polarizer does not cover the electrodeless area;

[0010] The TFT screen is attached to the outer surface of the bottom glass of the black and white screen and faces the electrodeless area, so that the image displayed by the TFT screen can be viewed through the electrodeless area of ​​the black and white screen, forming a TFT display area on the black and white screen.

[0011] Furthermore, a TFT screen polarizer is attached to the outer surface of the top glass of the TFT screen, and a TFT bottom polarizer is attached to the outer surface of the bottom glass of the TFT screen; the angle of the absorption axis of the TFT screen polarizer is perpendicular to the angle of the absorption axis of the TFT bottom polarizer; the angle of the absorption axis of the TFT screen polarizer is parallel to the angle of the absorption axis of the black and white screen polarizers.

[0012] Furthermore, the number of the pen segment pattern display areas is two, and the number of the TFT display area is one; the two pen segment pattern display areas are arranged on both sides of the TFT display area.

[0013] Furthermore, the TFT screen is adhered to the outer surface of the bottom glass of the black and white screen by means of OCA glue.

[0014] Furthermore, a black ink frame is printed around the outer surface of the bottom glass of the black and white screen corresponding to the position of the TFT screen to prevent light leakage, and the light from the TFT screen is transmitted from the black ink frame to the TFT display area.

[0015] Furthermore, black silicone is coated around the edge of the polarizer at the bottom of the black and white screen and the outer frame of the TFT screen to prevent light leakage.

[0016] Furthermore, the black and white screen includes, arranged from top to bottom in sequence: a black and white screen surface polarizer, a black and white screen surface glass, a black and white screen bottom glass, a black and white screen bottom polarizer, and a diffusion film pasted on the black and white screen bottom polarizer; wherein, liquid crystal material is sealed between the black and white screen surface glass and the black and white screen bottom glass; a PCB board is arranged below the diffusion film, and the black and white screen backlight source is installed on the PCB board.

[0017] Furthermore, the diffusion film is adhered to the polarizer at the bottom of the black and white screen by double-sided tape.

[0018] Furthermore, the TFT screen includes, arranged in sequence from top to bottom: a TFT screen surface polarizer, a TFT screen face glass, a TFT screen bottom glass, a TFT screen bottom polarizer, and a TFT screen light source; wherein, liquid crystal material is sealed between the TFT screen face glass and the TFT screen bottom glass; the bottom of the TFT screen light source is fixed on the PCB board; the installation area of ​​the black and white screen backlight source on the PCB board faces the diffusion film and avoids the fixed position of the TFT screen light source.

[0019] Furthermore, the light emitting surface of the TFT screen light source is adhered to the polarizer at the bottom of the TFT screen by double-sided tape.

[0020] The combined liquid crystal display provided by the utility model is composed of a black and white screen and a TFT screen. Because the TFT display area corresponding to the black and white screen does not require an ON-segment driver chip for display, as in the prior art, the circuit design is simplified. Furthermore, the black and white screen does not require a bottom polarizer to be attached to the TFT display area, significantly reducing product costs. Furthermore, because the bottom polarizer is omitted, the transmittance of the TFT display area is increased by over 50%. This significantly reduces the brightness of the TFT screen light source while maintaining the same target transmittance, further reducing heat dissipation and power consumption of the TFT screen light source. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a cross-sectional structural diagram of a triple-display integrated liquid crystal display provided by the prior art;

[0022] Figure 2 yes Figure 1 A plan view of the combined liquid crystal display shown;

[0023] Figure 3 yes Figure 1 A schematic diagram of the structure of the combined liquid crystal display shown;

[0024] Figure 4 yes Figure 1 Schematic diagram of the angular relationship between the absorption axes of the polarizers of the black and white screen and the TFT screen in the combined liquid crystal display;

[0025] Figure 5 This is a cross-sectional structural diagram of the triple-display integrated combined liquid crystal display provided by the present invention;

[0026] Figure 6 yes Figure 5 A schematic diagram of the structure of the combined liquid crystal display shown;

[0027] Figure 7 yes Figure 5 Schematic diagram of the angular relationship between the absorption axes of the polarizers of the black and white screen and the TFT screen in the combined liquid crystal display;

[0028] Figures 8A-8D This is a planar rendering of several other combined liquid crystal displays provided by the utility model;

[0029] Figure 9 This is a process flow chart of the combined liquid crystal display provided by the utility model. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0031] See Figure 5 The combined liquid crystal display provided by the present invention includes a black and white screen 1 and a TFT screen 2. The TFT screen 2 is pasted under the black and white screen 1. As an embodiment, the two can be pasted by OCA glue 3.

[0032] See also Figure 5 、 Figure 6 The black-and-white screen 1 includes at least the following components, arranged in order from top to bottom: a black-and-white screen polarizer 11, a black-and-white screen face glass 12, a black-and-white screen bottom glass 13, and a black-and-white screen bottom polarizer 141. Liquid crystal material is sealed between the black-and-white screen face glass 12 and the black-and-white screen bottom glass 13, and electrode patterns, such as an 8-shaped broken code, are arranged on the inner sides (i.e., the sides in contact with the liquid crystal material) of the black-and-white screen face glass 12 and the black-and-white screen bottom glass 13.

[0033] Similarly, the TFT screen 2 includes at least the following components, arranged in order from top to bottom: a TFT screen surface polarizer 21, a TFT screen surface glass 22, a TFT screen bottom glass 23, and a TFT screen bottom polarizer 24. That is, the outer surface of the TFT screen surface glass 22 is attached with the TFT screen surface polarizer 21, the outer surface of the TFT screen bottom glass 23 is attached with the TFT screen bottom polarizer 24, and liquid crystal material is sealed between the TFT screen surface glass 22 and the TFT screen bottom glass 23.

[0034] In the present invention, a black-and-white screen surface polarizer 11 is attached to the outer surface of the black-and-white screen's top glass 12, and a black-and-white screen bottom polarizer 141 is attached to the outer surface of the black-and-white screen's bottom glass 13. The black-and-white screen 1 has a pen segment pattern display area and an electrodeless area, and the black-and-white screen bottom polarizer 141 does not cover the electrodeless area.

[0035] The TFT screen 2 can be specifically adhered to the outer surface of the bottom glass 13 of the black and white screen through OCA glue 3, and facing the electrodeless area, so that the image displayed by the TFT screen 2 can be viewed through the electrodeless area of ​​the black and white screen 1, forming a TFT display area on the black and white screen 1.

[0036] Figure 7 The figure shows the angular relationship between the absorption axes of the polarizers of the black and white screen 1 and the TFT screen 2 in the combined liquid crystal display provided by the present invention. As can be seen from the figure, the angle of the absorption axis of the TFT screen polarizer 21 is perpendicular to the angle of the absorption axis of the TFT bottom polarizer 24, and the angle of the absorption axis of the TFT screen polarizer 21 is parallel to the angle of the absorption axis of the black and white screen polarizer 11.

[0037] It should be noted that Figure 7 The absorption axis angles of the polarizers shown are limited to the TFT display area. For the pen segment pattern display area, there is no TFT screen polarizer 21 and TFT bottom polarizer 24, and a black and white screen bottom polarizer 141 is also required.

[0038] As can be seen, the combined liquid crystal display provided by the present invention is composed of a black and white screen 1 and a TFT screen 2. Because the TFT display area corresponding to the center of the black and white screen 1 lacks an electrode pattern, it does not require the use of an ON-segment driver chip as in the prior art. This simplifies the circuit design, and eliminates the need for a bottom polarizer in the TFT display area of ​​the black and white screen 1, significantly reducing product costs. Furthermore, because the bottom polarizer 141 of the black and white screen is omitted, the light transmittance of the TFT display area is increased by over 50%. This significantly reduces the brightness of the TFT screen light source while maintaining the same target light transmittance, further reducing heat dissipation and power consumption of the TFT screen light source.

[0039] Further reading Figure 6A black ink frame 16 for preventing light leakage can be printed around the outer surface of the bottom glass 13 of the black and white screen corresponding to the position of the TFT screen 2. The light from the TFT screen 2 is transmitted from the black ink frame to the TFT display area.

[0040] Continue reading Figure 6 The edges of the black and white screen bottom polarizer 14 and the outer frame of the TFT screen 2 are coated with black silicone 7 to prevent light leakage.

[0041] Continue reading Figure 6 A diffusion film 15 is also attached to the polarizer 14 at the bottom of the black and white screen. This can be done with double-sided tape. Below the diffusion film 15 is a PCB 4, on which the black and white screen backlight is mounted. The black and white screen backlight is primarily LED. The diffusion film 15's function is to disperse the light emitted by the point-source LEDs into a uniform surface light source.

[0042] The TFT screen may further include a TFT backlight source 5 , the light emitting surface of the TFT screen light source 5 is adhered to the TFT screen bottom polarizer 14 through double-sided tape, and the bottom is fixed on the PCB board 4 .

[0043] The size of the TFT screen light source 5 is consistent with that of the TFT screen 2 , and the installation area of ​​the black and white screen backlight source on the PCB board 4 faces the diffusion film 15 and avoids the fixed position of the TFT screen light source 5 .

[0044] The above composite liquid crystal display is not limited to Figure 5 、 Figure 6 In the triple display integrated structure shown, the number of the segment pattern display area and the TFT display area can be arbitrary, and the positional relationship between the two can also be flexibly designed according to the specific vehicle display requirements, for example Figure 5 、 Figure 6 The number of the pen segment pattern display areas shown is two, and the number of the TFT display area is one. The two pen segment pattern display areas are arranged on both sides of the TFT display area. Figure 8A The two segment pattern display areas and two TFT display areas shown, or Figure 8B The TFT display area shown is surrounded by the pen segment pattern display area, or Figure 8C As shown, there are one pen segment pattern display area and one TFT display area arranged on the left and right, or Figure 8D As shown, there is one pen segment pattern display area and one TFT display area arranged one above and one below.

[0045] Figure 9 The process flow of the combined liquid crystal display provided by the present invention is as follows:

[0046] The production process of the semi-finished black and white screen is as follows: FOG (Flexible On Glass), the flexible circuit board is bonded to the black and white screen bottom glass 13 - a black ink frame is printed on the outer surface of the black and white screen bottom glass - affixed with the black and white screen top polarizer and the black and white screen bottom polarizer - affixed with the diffusion film;

[0047] TFT screen semi-finished product production process: FOG (Flexible On Glass), binding the flexible circuit board to the bottom glass 23 of the TFT screen ----- pasting the TFT screen polarizer and the black and white screen bottom polarizer ----- assembling the TFT screen backlight on the outer surface of the TFT screen bottom polarizer;

[0048] OCA bonding process: The semi-finished TFT screen is glued to the outer surface of the bottom glass of the black and white screen through OCA glue-----black silicone is applied around the edge of the black and white screen bottom polarizer and the outer frame of the TFT screen.

[0049] The above process sequence can be adaptively adjusted according to specific products and operating habits.

[0050] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A combined liquid crystal display, characterized in that: include: A black and white screen having a pen segment pattern display area and an electrodeless area, wherein a black and white screen surface polarizer is attached to the outer surface of the black and white screen's top glass, and a black and white screen bottom polarizer is attached to the outer surface of the black and white screen's bottom glass, and the black and white screen bottom polarizer does not cover the electrodeless area; The TFT screen is attached to the outer surface of the bottom glass of the black and white screen and faces the electrodeless area, so that the image displayed by the TFT screen can be viewed through the electrodeless area of ​​the black and white screen, forming a TFT display area on the black and white screen.

2. The combined liquid crystal display according to claim 1, wherein: The outer surface of the TFT screen's top glass is attached with a TFT screen polarizer, and the outer surface of the TFT screen's bottom glass is attached with a TFT bottom polarizer; The angle of the light absorption axis of the TFT screen polarizer is perpendicular to the angle of the light absorption axis of the TFT bottom polarizer; The angle of the absorption axis of the TFT panel polarizer is parallel to the angle of the absorption axis of the black and white panel polarizer.

3. The combined liquid crystal display according to claim 1, wherein: The number of the pen segment pattern display areas is two, and the number of the TFT display area is one; The two segment pattern display areas are arranged on both sides of the TFT display area.

4. The combined liquid crystal display according to claim 1, wherein: The TFT screen is adhered to the outer surface of the bottom glass of the black and white screen by OCA glue.

5. The combined liquid crystal display according to claim 1, wherein: A black ink frame is printed around the outer surface of the bottom glass of the black and white screen corresponding to the position of the TFT screen to prevent light leakage. The light from the TFT screen is transmitted through the black ink frame to the TFT display area.

6. The combined liquid crystal display according to claim 1, wherein: The edges of the polarizer at the bottom of the black and white screen and the outer frame of the TFT screen are coated with black silicone to prevent light leakage.

7. The combined liquid crystal display according to claim 1, wherein: The black and white screen includes the following components arranged from top to bottom: black and white screen surface polarizer, black and white screen surface glass, black and white screen bottom glass, black and white screen bottom polarizer, and diffusion film attached to the black and white screen bottom polarizer; Among them, liquid crystal material is sealed between the black and white screen surface glass and the black and white screen bottom glass; A PCB board is provided under the diffusion film, and a black and white screen backlight source is installed on the PCB board.

8. The combined liquid crystal display according to claim 7, wherein: The diffusion film is adhered to the polarizer at the bottom of the black and white screen by double-sided adhesive tape.

9. The combined liquid crystal display according to claim 7 or 8, wherein: The TFT screen includes the following components arranged from top to bottom: TFT screen polarizer, TFT screen surface glass, TFT screen bottom glass, TFT screen bottom polarizer, and TFT screen light source; Among them, liquid crystal material is sealed between the surface glass of the TFT screen and the bottom glass of the TFT screen; The bottom of the TFT screen light source is fixed on the PCB board; The installation area of ​​the black and white screen backlight on the PCB board faces the diffusion film and avoids the fixed position of the TFT screen light source.

10. The combined liquid crystal display according to claim 9, wherein: The light emitting surface of the TFT screen light source is glued to the polarizer at the bottom of the TFT screen through double-sided tape.

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