WO2019080322A1

WO2019080322A1 - Direct type backlight display module and terminal device

Info

Publication number: WO2019080322A1
Application number: PCT/CN2017/116792
Authority: WO
Inventors: 宋高博
Original assignee: 广州视源电子科技股份有限公司; 广州视睿电子科技有限公司
Priority date: 2017-10-23
Filing date: 2017-12-17
Publication date: 2019-05-02
Also published as: CN207396930U

Abstract

A direct type backlight display module and a terminal device. The direct type backlight display module comprises a backlight module, a liquid crystal panel (6), an electromagnetic input module, and a master control circuit; the backlight module comprises a backplane (1), a light emitting structure provided on the backplane (1), and a diffusion plate (4) directly facing the light emitting structure; the liquid crystal panel (6) is provided at one side of the diffusion plate (4) away from the light emitting structure; the electromagnetic input module comprises an electromagnetic circuit printed on the diffusion plate (4); the backlight module, the liquid crystal panel (6), and the electromagnetic circuit are all connected to the master control circuit. By printing the electromagnetic circuit on the diffusion plate (4), the low-cost direct type backlight display module can also integrate the electromagnetic input technology to meet the requirements for touch control, and the printed electromagnetic circuit can be more closely connected to the diffusion plate (4).

Description

Direct type backlight display module and terminal device

Technical field

The utility model relates to the technical field of display devices, in particular to a direct type backlight display module and a terminal device comprising the direct type backlight display module.

Background technique

In the conventional technology, the liquid crystal display has become a mainstream display in the market due to its low electromagnetic radiation, low power consumption, low heat generation, light weight and the like, and the LED backlight display has also been widely used. At present, LED backlight displays on the market are mainly divided into two types: side-in and direct-down. Wherein, the side-entry type is to install the LED light string as the backlight module around the liquid crystal screen, and the direct-type type is to install the LED light string as the backlight module on the front and back of the liquid crystal screen, and the direct-lit backlight display is relatively straight. Lower cost and wider application.

With the development of input technology and display technology, the combination of commonly used liquid crystal displays and touch devices is a market development trend. Moreover, the market demand for touch input is also getting higher and higher, such as the pursuit of the original handwriting input effect, so the electromagnetic screen technology has been widely used. However, for a direct-lit LED-backlit display (DLED), since the light source is disposed on the front side of the liquid crystal screen, when the electromagnetic screen is mounted on the liquid crystal screen, the effect of the light source on the liquid crystal screen is seriously affected. If the DLED electromagnetic screen is embedded between the reflective sheet and the light guide plate, the following two problems will occur: 1. The circuit on the light strip will interfere with the electromagnetic wave; The electromagnetic screen is too far away from the writing surface, and both of these problems will reduce the writing effect.

Utility model content

The purpose of the embodiments of the present invention is to provide a direct-lit backlight display module and a terminal device, which can integrate the electromagnetic touch input into the direct-lit backlight display module.

To achieve the above objective, the embodiment of the present invention adopts the following technical solutions:

In one aspect, a direct type backlight display module is provided, including:

a backlight module, the backlight module includes a back plate, a light emitting structure disposed on the back plate, and a diffusing plate facing the light emitting structure;

a liquid crystal panel disposed on a side of the diffusion plate away from the light emitting structure;

An electromagnetic input module, the electromagnetic input module comprising an electromagnetic circuit printed on the diffusion plate;

The main control circuit, the backlight module, the liquid crystal panel and the electromagnetic circuit are all connected to the main control circuit.

As a preferred embodiment of the direct-lit backlight display module, a side of the diffusing plate adjacent to the light-emitting structure is provided with a groove structure matching the electromagnetic circuit, and the electromagnetic circuit is disposed in the groove structure; or,

The diffusion plate is disposed adjacent to a side surface of the liquid crystal panel with a groove structure matching the electromagnetic circuit, and the electromagnetic circuit is disposed in the groove structure.

As a preferred embodiment of the direct type backlight display module, a side of the electromagnetic circuit away from the groove bottom of the groove structure is flush with a notch of the groove structure.

As a preferred embodiment of the direct type backlight display module, an optical film assembly is disposed between the diffusion plate and the liquid crystal panel, and the optical film assembly includes a diffusion film and a brightness enhancement film sequentially stacked on the diffusion plate. .

As a preferred embodiment of the direct type backlight display module, the shape and area of the liquid crystal panel and the optical film assembly are the same, and the liquid crystal panel is aligned with the edge of the optical film assembly.

A preferred embodiment of the direct type backlight display module further includes a touch provided on the liquid crystal panel Touching the input module, the touch input module includes a touch input board disposed on the liquid crystal panel, and a touch control circuit connected to the touch input board, wherein the touch control circuit is connected to the main control circuit.

As a preferred embodiment of the direct-lit backlight display module, the light-emitting structure includes a light bar disposed on the back plate and facing the diffusion plate, and a reflection surrounding the bottom side and the circumference side of the light bar. a sheet, the reflection sheet corresponding to the diffusion plate.

As a preferred solution of the direct type backlight display module, a heat dissipation plate is disposed between the back plate and the light emitting structure.

As a preferred solution of the direct type backlight display module, the heat dissipation plate is a nano carbon heat dissipation plate.

In another aspect, there is also provided a terminal device comprising the direct type backlight display module as described above.

The beneficial effects of the embodiments of the present invention are: by printing electromagnetic lines on the diffusion plate, the electromagnetic input technology can also be integrated on the low-cost direct-lit backlight display module to meet the needs of the touch, and the electromagnetic molding of the printing The connection between the line and the diffuser is tighter.

DRAWINGS

The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

1 is a cross-sectional view of a direct type backlight display module according to an embodiment of the present invention.

In the picture:

1, back plate; 2, reflective sheet; 3, light strip; 4, diffuser; 5, optical diaphragm assembly; 51, diffusion film; 52, brightness enhancement film; 6, liquid crystal panel; 7, tempered glass.

Detailed ways

The technical solutions of the present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

As shown in FIG. 1 , the direct-lit backlight display module provided by the embodiment of the present invention includes a backlight module, a liquid crystal panel 6, an electromagnetic input module, and a main control circuit, wherein the backlight module includes a back plate 1 and is disposed on a light-emitting structure on the back plate 1, and a diffusing plate 4 facing the light-emitting structure, the liquid crystal panel 6 is disposed on a side of the diffusing plate 4 away from the light-emitting structure, and the electromagnetic input module includes an electromagnetic circuit printed on the diffusing plate 4, and the backlight The module, the liquid crystal panel 6, and the electromagnetic circuit are all connected to the main control circuit. By printing the electromagnetic circuit on the diffusion plate 4, the electromagnetic input technology can be integrated on the low-cost direct-type backlight display module to meet the needs of the touch, and the connection between the printed electromagnetic circuit and the diffusion plate 4 is satisfied. More closely.

Specifically, the backboard 1 provides a mounting base for the entire backlight module, and can be made of metal. When the backboard 1 is made of metal, not only the support strength is high, but also the heat dissipation effect of the light-emitting structure can be improved, and the light-emitting structure can be emitted. The light illuminates the liquid crystal panel 6, and the tempered glass 7 is provided on the side of the liquid crystal panel 6 away from the light emitting structure, and the tempered glass 7 is used to protect the liquid crystal panel 6.

In the embodiment, the diffusion plate 4 is made of PS and has a thickness of 1 to 2 mm. The diffusion plate 4 can atomize the light source to improve the uniformity of the image. In addition, the diffusion plate 4 has a certain rigidity and can support the printing in diffusion. Electromagnetic circuit on board 4.

PS board is polystyrene board, commonly known as "organic board", the English name Polystyene, density is 1.02 ~ 1.08, it is a thermoplastic, the transparency is relatively high (transmittance is second only to plexiglass), has excellent electrical insulation Sex, high-frequency insulation is better, the quality is brittle, impact resistance, can resist general chemical corrosion, chemical stability, hardness similar to that of organic glass, water absorption and thermal expansion coefficient are smaller than that of organic glass, and the price is lower than that of organic glass.

In other embodiments, the diffuser panel 4 can also be made of acrylic, PET or PC.

Acrylic, also known as PMMA or Acrylic, is derived from English acrylic (acrylic plastic). The chemical name is polymethyl methacrylate, which is an important plastic polymer material developed earlier and has better properties. It has a wide range of applications in the construction industry due to its transparency, chemical stability and weather resistance, easy dyeing, easy processing and beautiful appearance.

PET is polyethylene terephthalate, which is the most important type of thermoplastic polyester. The English name is Polyethylene terephthalate. PET is a milky white or light yellow highly crystalline polymer with a smooth and lustrous surface. PET has the following advantages: (1) resistance to creep, fatigue resistance, abrasion resistance and dimensional stability, low abrasion and high hardness, and maximum toughness in thermoplastics; (2) good electrical insulation properties, temperature The impact is small; (3) non-toxic, weather-resistant, chemical-resistant, and low water absorption.

The PC board is a high-quality sheet made of polycarbonate as the main component and co-extrusion technology CO-EXTRUSION. PC board has the following characteristics: (1) Transmittance: PC board transmittance is up to 89%, comparable to glass; (2) Impact resistance: impact strength is 250-300 times that of ordinary glass, the same thickness 30 times of acrylic sheet is 2-20 times of tempered glass. It has no cracks from 2 meters to PC board with 3kg weight. It has the reputation of “not broken glass” and “ring steel”; (3) UV protection The PC board is coated with an anti-ultraviolet (UV) coating on one side and anti-condensation treatment on the other side. It combines UV-resistant, heat-insulating and anti-drip functions to block UV rays, which is suitable for protecting valuable artworks and exhibits. It is not damaged by ultraviolet rays; (4) Light weight: the specific gravity is only half of the glass, saving the cost of transportation, handling, installation and supporting frame; (5) Flame retardant: the national standard GB50222-95 confirms that the PC board is flame retardant Class, ie B1 level, PC board's own ignition point is 580 degrees Celsius, self-extinguishing from the fire, no toxic gas will be produced during combustion, will not promote the spread of fire; (6) Flexibility: can be used in the construction site according to the design drawings Cold-bending, mounted in an arched, semi-circular top and window. The minimum bending radius is 175 times of the thickness of the plate, and it can also be hot-bent; (7) Sound insulation: The PC board has obvious sound insulation effect, and has better acoustic insulation than the same thickness of glass and acrylic sheet under the same thickness. The sound insulation of PC board is 3-4DB higher than that of glass. It is the preferred material for highway noise barriers in the world; (8) Energy-saving: cool in summer, warm in winter, PC board is lower than ordinary glass and other plastics. Thermal conductivity (K value), insulation effect is 7%-25% higher than equivalent glass, PC board insulation is highest 49%, so that the heat loss is greatly reduced, for buildings with heating equipment, is an environmentally friendly material; (9) Temperature adaptability: PC board does not occur cold-brittle at -100 °C, does not soften at 135 °C, in bad The mechanics and mechanical properties of the environment did not change significantly.

In a preferred embodiment of the present invention, the diffuser plate 4 is disposed on a side of the light emitting structure with a groove structure matching the electromagnetic circuit, and the electromagnetic circuit is disposed in the groove structure; or the diffuser plate 4 is adjacent to the liquid crystal panel. One side of the 6 is provided with a groove structure matching the electromagnetic circuit, and the electromagnetic circuit is disposed in the groove structure.

In this embodiment, the side of the electromagnetic circuit away from the groove bottom of the groove structure is flush with the groove of the groove structure.

By providing a groove structure on the diffusion plate 4 in advance, the shape of the groove structure on the diffusion plate 4 is consistent with the structure of the electromagnetic circuit, and then the electromagnetic circuit is printed in the groove structure, that is, the electromagnetic circuit is hidden in the diffusion plate 4. It does not require extra space and is convenient for the thin design of the device.

In another preferred embodiment of the present invention, an optical film assembly 5 is disposed between the diffusion plate 4 and the liquid crystal panel 6. The optical film assembly 5 includes a diffusion film 51 and a brightness enhancement film 52 which are sequentially stacked on the diffusion plate 4. .

The optical patch assembly 5 can further process the light for better light effects. The use of the diffusion film 51 further enhances the utilization of light and enhances the brightness. In addition, the brightness enhancement film 52 can further enhance the brightness of the light and improve the display effect.

In the present embodiment, the shape and area of the liquid crystal panel 6 and the optical film assembly 5 are the same, and the liquid crystal panel 6 is aligned with the edge of the optical film assembly 5.

In another preferred embodiment of the present invention, the direct-lit backlight display module further includes a touch input module disposed on the liquid crystal panel 6, and the touch input module includes a touch input board disposed on the liquid crystal panel 6, and Touch control circuit connected to touch input pad, touch control circuit and main control circuit connection.

The touch control circuit can be used to control the touch input board to control the opening, closing and adjusting of the touch input function, so that the direct type backlight display module has an ordinary touch input function. The touch input panel of the touch input module also has good light transmittance, and does not affect the display effect of the direct type backlight display module.

In a specific embodiment of the present invention, the light-emitting structure includes a light bar 3 disposed on the back plate 1 and facing the diffuser plate 4, and a reflective sheet 2 surrounding the bottom side and the circumference side of the light bar 3, The reflection sheet 2 corresponds to the diffusion plate 4.

The reflection sheet 2 can reflect part of the exposed light, and reflect the light to the diffusion plate 4, so that the light can be used twice, thereby improving the utilization of the light and improving the brightness. Moreover, the reflection sheet 2 is semi-enclosed on one side of the light bar 3, and the light emitted from the light bar 3 can be sufficiently reflected to better improve the light utilization efficiency.

In order to improve the heat dissipation effect of the light bar 3, a heat dissipation plate is disposed between the back plate 1 and the light emitting structure. Preferably, the heat dissipation plate is a nano carbon heat dissipation plate. The nano-carbon material has a photo-thermal conversion effect, which can convert thermal energy into light energy, and can also convert light energy into heat energy, which not only can improve the heat dissipation effect, but also improve the brightness of the display module.

The embodiment of the present invention further provides a terminal device, including the direct type backlight display module of any of the above embodiments.

It should be noted that the foregoing specific embodiments are merely preferred embodiments of the present invention and the technical principles applied thereto, and any changes that are easily conceived by those skilled in the art are possible within the technical scope of the present disclosure. Replacement should be covered by the scope of the present invention.

The present invention has been described above by way of specific embodiments, but the present invention is not limited to these specific embodiments. Those skilled in the art should understand that various modifications can be made to the present invention. Change, equivalent replacement, change, etc. However, these modifications are intended to be within the scope of the present invention as long as they do not depart from the spirit of the invention. In addition, some terms used in the specification and claims of the present application are not limiting, but are merely for convenience of description. In addition, the "one embodiment", the "another embodiment" and the like in the various places above represent different embodiments, and of course, all or part of them may be combined in one embodiment.

Claims

A direct type backlight display module, comprising:

a backlight module, the backlight module includes a back plate, a light emitting structure disposed on the back plate, and a diffusing plate facing the light emitting structure;

a liquid crystal panel disposed on a side of the diffusion plate away from the light emitting structure;

An electromagnetic input module, the electromagnetic input module comprising an electromagnetic circuit printed on the diffusion plate;

The main control circuit, the backlight module, the liquid crystal panel and the electromagnetic circuit are all connected to the main control circuit.
The direct-lit backlight display module of claim 1 , wherein a side of the diffuser plate adjacent to the light-emitting structure is provided with a groove structure matching the electromagnetic circuit, and the electromagnetic circuit is disposed at Within the groove structure; or,

The diffusion plate is disposed adjacent to a side surface of the liquid crystal panel with a groove structure matching the electromagnetic circuit, and the electromagnetic circuit is disposed in the groove structure.
The direct-lit backlight display module according to claim 2, wherein a side of the electromagnetic circuit away from the groove bottom of the groove structure is flush with a notch of the groove structure.
The direct-lit backlight display module according to claim 3, wherein an optical film assembly is disposed between the diffusion plate and the liquid crystal panel, and the optical film assembly includes a diffusion plate sequentially stacked on the diffusion plate. Diffusion film and brightness enhancement film.
The direct-lit backlight display module according to any one of claims 1 to 4, wherein a shape and an area of the liquid crystal panel and the optical film assembly are the same, and the liquid crystal panel and the optical The edges of the diaphragm assembly are aligned.
The direct-lit backlight display module according to any one of claims 1 to 4, further comprising a touch input module disposed on the liquid crystal panel, wherein the touch input module comprises a liquid crystal display a touch input pad on the panel, and a touch control circuit connected to the touch input pad, The touch control circuit is connected to the main control circuit.
The direct-lit backlight display module according to any one of claims 1 to 4, wherein the light-emitting structure comprises a light bar disposed on the back plate and facing the diffusion plate, and surrounding The reflection sheet on the bottom side and the circumference side of the light bar, the reflection sheet corresponding to the diffusion plate.
The direct type backlight display module according to any one of claims 1 to 4, wherein a heat dissipation plate is disposed between the back plate and the light emitting structure.
The direct type backlight display module according to claim 8, wherein the heat dissipation plate is a nano carbon heat dissipation plate.
A terminal device comprising the direct type backlight display module according to any one of claims 1 to 9.