CN103216780A

CN103216780A - Backlight module and display equipment

Info

Publication number: CN103216780A
Application number: CN2012100192638A
Authority: CN
Inventors: 孙嘉辉
Original assignee: TPV Investment Co Ltd
Current assignee: TPV Investment Co Ltd; TPV Technology Co Ltd
Priority date: 2012-01-19
Filing date: 2012-01-19
Publication date: 2013-07-24

Abstract

A backlight module comprises a light guide plate, a solar panel, a light source unit and a power supply unit, wherein the light guide plate comprises a first side face, a second side face and a surrounding face. The solar panel covers the first side face and the surrounding face of the light guide face. The light source unit is arranged between the light guide plate and the solar panel, the light source unit emits light rays which are incident to the light guide plate, the incident light rays are emitted out by the reflection of the second side face of the light guide plate, and the light source unit emits light rays which are incident to the solar panel. The power supply unit comprises a power conversion circuit electrically connected with the solar panel, a battery and a switching circuit, the power conversion unit converts light energy received by the solar panel and stores in the battery, and the switching circuit switches one of the battery and an external power source for powering the light source unit according to the charge capacity of the battery.

Description

Backlight module and display device

Technical field

The present invention relates to a kind of backlight module, particularly relate to a kind of backlight module and a kind of display device that uses above-mentioned backlight module of display device.

Background technology

Along with the progress of science and technology, LCD can have more frivolous advantage compared to traditional CRT, so often apply in the electronic product miscellaneous; Little to portable electronic product as mobile phone, common LCD TV footprint of visible its application all to the family greatly.

Liquid crystal molecule itself in the LCD is not because of having luminous ability, must shine constantly by the light source of backlight module in liquid crystal molecule, just can keep the picture of LCD, and the power consumption of backlight liquid crystal display module accounts for LCD whole power consumption very high percentage.

Consult Fig. 1, backlight liquid crystal display module 9 has a LGP 91, a light source 92 and a polarizer 93 usually, light source 92 irradiations have 60% light to be directed into polarizer 93 via LGP 91 after LGP 91 approximately, and that is to say has 40% light to be effectively used approximately.Therefore, how the luminous energy of backlight module 9 is made full use of and the electric power that how to reduce external power source supply backlight module 9 is an important topic.

Summary of the invention

The object of the present invention is to provide a kind of backlight module of effective reduction external power source supply electric power.

Backlight module of the present invention receives an external power source, provides light source to a LCD MODULE during running, comprises a LGP, a solar panel, a light source cell and an electric power feed unit.

LGP of the present invention comprises one first side, one and second side of this first side thereof opposite and contiguous this LCD MODULE, and one around connecting the center on face of this first side with the periphery of this second side.This solar panel is covered in this first side of this LGP and the local at least face that centers on.This light source cell is located between this LGP and this solar panel, and the part light that this light source cell sends is incident to this LGP and goes out via this second side projection of this LGP, and all the other light that this light source cell sends are incident to this solar panel.This electric power feed unit comprises that a power conversion circuit, that is electrically connected this solar panel is electrically connected the battery of this power conversion circuit, reach the commutation circuit of this battery of electrical connection and this external power source, this power conversion circuit is changed the electric energy that this solar panel produces and is stored in this battery, and this commutation circuit switches this battery according to the charge capacity of this battery and this light source cell is given in one of them power supply of this external power source.

Preferably, this light source cell is close to being somebody's turn to do around face of this LGP, and centers on the face incident ray to this LGP via this.

Preferably, this first side of contiguous this LGP of this light source cell, and via this first side incident ray to this LGP.

More preferably, this commutation circuit judges according to a voltage quasi position whether the charge capacity of this battery has exceeded this voltage quasi position, and when the charge capacity of this battery accumulation exceeded this voltage quasi position, this commutation circuit was switched this powered battery to this light source cell.

Another object of the present invention is to provide a kind of display device.

Display device of the present invention comprises a backlight module and a LCD MODULE.

Backlight module of the present invention comprises a LGP, one solar panel, one light source cell and an electric power feed unit, this LGP has one first side, one with second side of this first side thereof opposite and a face that centers on around the periphery that is connected this first side and this second side, this solar panel is covered in this first side of this LGP and the local at least face that centers on, this light source cell is located between this LGP and this solar panel, the part light that this light source cell sends is incident to this LGP and goes out via this second side projection of this LGP, all the other light that this light source cell sends are incident to this solar panel, this electric power feed unit has the power conversion circuit of this solar panel of electrical connection, one battery and that is electrically connected this power conversion circuit is electrically connected the commutation circuit of this battery and this external power source, this power conversion circuit is changed the luminous energy that this solar panel receives and is stored in this battery, and this commutation circuit switches this battery according to the charge capacity of this battery and this light source cell is given in one of them power supply of this external power source.This LCD MODULE comprises the light that a plurality of liquid crystal molecules and reception are gone out by this backlight module scattering, and then illuminates described liquid crystal molecule, contiguous this LCD MODULE in this of this backlight module second side.

Beneficial effect of the present invention is: backlight module is provided with one and is covered in this first side of this LGP and the local at least solar panel around face, absorb the luminous energy of backlight module whereby, and convert electric energy to and recharge power supply and give backlight module, and then effectively reduce the supply electric power of external power source.

Description of drawings

Fig. 1 is a three-dimensional exploded view, and existing display device is described;

Fig. 2 is a combination cross-sectional schematic of first preferred embodiment of display device of the present invention, and the design of display device backlight module is described;

Fig. 3 is a circuit diagram of present embodiment, and the design of electric power feed unit is described; And

Fig. 4 is a combination cross-sectional schematic of second preferred embodiment of display device of the present invention, and the design of display device backlight module is described.

The specific embodiment

The present invention is described in detail below in conjunction with drawings and Examples.

Consult Fig. 2,3, first preferred embodiment of display device 100 of the present invention comprises a backlight module 2 and a LCD MODULE 3, and display device 100 receptions one provide the external power source 4 of electric power.

Backlight module 2 comprises a LGP 21, several solar panels 22, a light source cell 23 and an electric power feed unit 24, and in the present embodiment, backlight module 2 is the backlight module 2 of a side-light type.

LGP 21 has one first side 211, second side 212 and opposite with first side 211 around connecting the center on face 213 of first side 211 with the periphery of second side 212.

Solar panel 22 is covered in first side 211 of LGP 21 and the local at least face 213 that centers on, in the present embodiment, solar panel 22 is the solar panel 22 of one silica-based (Silicon-B ase), dye sensitization (Dye-sensitized), film (Thin Film) or gang type (Tandem), but do not exceed its first side 211 and the complete face 213 that centers in order to cover LGP 21 with above-mentioned content.

Light source cell 23 is located between LGP 21 and the solar panel 22, is to be located at the wherein face 213 that centers on of a side of contiguous LGP 21 at present embodiment, and light source cell 23 has the photophore 232 that a lampshade 231 and is located at lampshade 231.The inner surface of lampshade 231 has highly reflective, the light that photophore 232 sends can via around face 213 directly into being incident upon LGP 21, or by after the reflection of lampshade 231 inner surfaces, again via being incident to LGP 21 around face 213.The light that is incident to LGP 21 goes out via second side, 212 projections of LGP 21 again, and simultaneously, the light that photophore 232 sends also can be incident to solar panel 22.In other words, the part light that this light source cell 23 sends is incident to this LGP 21 and goes out via these second side, 212 projections of this LGP 21, and all the other light that this light source cell 23 sends are incident to this solar panel 22.In the present embodiment, photophore 232 is as light source with a light emitting diode (LED), an electroluminescence sheet (EL), a hot-cathode fluorescent lamp (HCFL) or a cold-cathode fluorescence lamp (CCFL).

Electric power feed unit 24 has the battery 242 that a power conversion circuit 241, that is electrically connected solar panel 22 is electrically connected power conversion circuit 241, and the commutation circuit 243 of an electrical connection battery 242 and external power source 4.The electric energy that power conversion circuit 241 conversion solar panels 22 are produced also is stored in battery 242, and commutation circuit 243 switches battery 242 according to the charge capacity of battery 242 and light source cell 23 is given in external power source 4 one of them power supply.In the present embodiment, commutation circuit 243 judges according to a voltage quasi position whether the charge capacity of battery 242 has exceeded voltage quasi position, and when the charge capacity of battery 242 accumulations exceeded voltage quasi position, commutation circuit 243 was switched battery 242 power supplies to light source cell 23.When the charge capacity of battery 242 accumulations did not exceed voltage quasi position, commutation circuit 243 was switched external power source 4 power supplies to light source cell 23.

LCD MODULE 3 comprises a layer of liquid crystal molecule 31, two Polarizers 32, two glass substrates 33, two alignment films 34, reaches a colored filter 35.

Layer of liquid crystal molecule 31 is located in respectively between this two glass substrate 33, each glass substrate 33 is respectively equipped with an alignment film 34 and a Polarizer 32, alignment film 34 in order to Liquid Crystal Molecules Alignment evenly between

glass substrate

33,32 of each Polarizers have a specific polarization direction, and, wherein a glass substrate 33 also is provided with several triodes, reverse liquid crystal molecule in order to control, wherein 33 of another glass substrates are provided with colored filter 35, in order to provide each pixel required red, green and primary colors.What further specify is, when light during by a Polarizer 32 incidents wherein, the light that only meets its polarization direction could pass through, at this moment, the triode control liquid crystal molecule of glass substrate 33 is reversed into a specific direction, allows shine in the light of liquid crystal molecule change its direct of travel, to form different GTG brightness in display frame, form the pixel required color by colored filter 35 again, promptly finish the display frame of LCD MODULE 3.

In more detail, display device 100 of the present invention is to give backlight module 2 and LCD MODULE 3 by external power source 4 power supplies at the beginning, but the photophore 232 of backlight module 2 is incident to the light of LGP 21, and can't absolutely go out by second side, 212 projections of LGP 21, therefore, the light that has a part is worn via first side 211 of LGP 21 and around face 213 and is penetrated, at this moment, can receive around the solar panel 22 of LGP 21 and to wear the light penetrated and its luminous energy of accumulation and to convert electric energy to, pass through battery 242 store electrical energy of electric power feed unit 24 again, thus, display device 100 of the present invention can change by battery 242 power supplies, reduces the power usage of external power source 4.

Consult Fig. 3 and Fig. 4, second preferred embodiment of display device 100 of the present invention and the difference of first preferred embodiment are that backlight module is the backlight module 2 ' of a straight-down negative.

Light source cell 23 ' is located between LGP 21 and the solar panel 22, and first side 211 of contiguous LGP 21, light source cell 23 ' has several photophores 232 ', the light that photophore 232 ' sends via first side 211 directly into being incident upon LGP 21, simultaneously, the light that sends of photophore 232 ' also can be incident to solar panel 22.She Ji advantage is that backlight module 2 ' has higher briliancy and good bright dipping visual angle like this, cover first side 211 of photophore 232 ' and LGP 21 and center on face 213 by solar panel 22, absorbing photophore 232 ' can't be directly into the light that is incident upon LGP 21, and then with the transform light energy that absorbs for the electric energy of display device 100 is provided, the backlight module 2 ' that effectively overcomes straight-down negative is than the backlight module 2 of the side-light type shortcoming of power consumption more.

In sum, the side light type back light module 2 and the direct type backlight module 2 ' of display device 100 of the present invention are covered in light source cell 23 by solar panel 22,23 ' photophore 232,232 ' and first side 211 of LGP 21 with around face 213, effectively absorb photophore 232,232 ' can't be directly into the light that is incident upon LGP 21, and by first side 211 of LGP 21 and the light that penetrates around face 213, battery 242 by electric power feed unit 24 recharges power supply to display device 100 again, effectively utilize backlight module 2,2 ' luminous energy, prolong backlight module 2,2 ' service time, save the power cost of display device 100, so can reach purpose of the present invention really.

The above person of thought, it only is preferred embodiment of the present invention, when not limiting scope of the invention process with this, promptly the simple equivalent of being done according to claim of the present invention and invention description content generally changes and modifies, and all still belongs in the scope that patent of the present invention contains.

Claims

1. backlight module, receive an external power source, provide light source to a LCD MODULE during running, this backlight module comprises a LGP, this LGP comprises one first side, one and second side of this first side thereof opposite and contiguous this LCD MODULE, and one around connecting the center on face of this first side with the periphery of this second side; It is characterized in that: this backlight module also comprises a solar panel, one light source cell and an electric power feed unit, this solar panel is covered in this first side of this LGP and the local at least face that centers on, this light source cell is located between this LGP and this solar panel, the part light that this light source cell sends is incident to this LGP and goes out via this second side projection of this LGP, all the other light that this light source cell sends are incident to this solar panel, this electric power feed unit comprises that one is electrically connected the power conversion circuit of this solar panel, one is electrically connected the battery of this power conversion circuit, reach the commutation circuit of this battery of electrical connection and this external power source, this power conversion circuit is changed the electric energy that this solar panel produces and is stored in this battery, and this commutation circuit switches this battery according to the charge capacity of this battery and this light source cell is given in one of them power supply of this external power source.

2. backlight module according to claim 1 is characterized in that: this light source cell is close to being somebody's turn to do around face of this LGP, and centers on the face incident ray to this LGP via this.

3. backlight module according to claim 1 is characterized in that: this first side of contiguous this LGP of this light source cell, and via this first side incident ray to this LGP.

4. according to claim 2 or 3 described backlight modules, it is characterized in that: this commutation circuit judges according to a voltage quasi position whether the charge capacity of this battery has exceeded this voltage quasi position, when the charge capacity of this battery accumulation exceeded this voltage quasi position, this commutation circuit was switched this powered battery to this light source cell.

5. display device receives an external power source that electric power is provided, and this display device comprises a backlight module and a LCD MODULE; It is characterized in that: this backlight module comprises a LGP, one solar panel, one light source cell and an electric power feed unit, this LGP has one first side, one with second side of this first side thereof opposite and a face that centers on around the periphery that is connected this first side and this second side, this solar panel is covered in this first side of this LGP and the local at least face that centers on, this light source cell is located between this LGP and this solar panel, the part light that this light source cell sends is incident to this LGP and goes out via this second side projection of this LGP, all the other light that this light source cell sends are incident to this solar panel, this electric power feed unit has the power conversion circuit of this solar panel of electrical connection, one battery and that is electrically connected this power conversion circuit is electrically connected the commutation circuit of this battery and this external power source, this power conversion circuit is changed the luminous energy that this solar panel receives and is stored in this battery, this commutation circuit switches this battery according to the charge capacity of this battery and this light source cell is given in one of them power supply of this external power source, this LCD MODULE comprises the light that a plurality of liquid crystal molecules and reception are gone out by this backlight module scattering, and then illuminate described liquid crystal molecule, and contiguous this LCD MODULE in this second side of this backlight module.

6. display device according to claim 5 is characterized in that: this light source cell is close to being somebody's turn to do around face of this LGP, and centers on the face incident ray to this LGP via this.

7. display device according to claim 5 is characterized in that: this first side of contiguous this LGP of this light source cell, and via this first side incident ray to this LGP.

8. according to claim 6 or 7 described display devices, it is characterized in that: this commutation circuit judges according to a voltage quasi position whether the charge capacity of this battery has exceeded this voltage quasi position, when the charge capacity of this battery accumulation exceeded this voltage quasi position, this commutation circuit was switched this powered battery to this light source cell.