CN1570728A - High-resolution liquid crystal display device with field emission display backlight source - Google Patents

带场发射显示背光源的高分辨率液晶显示器件，涉及带有背光源的液晶显示器件，特别是高分辨率液晶显示中所采用的背光源技术，该显示器件的层状结构自上至下顺序为：表面反射膜(8)、检偏片(7)、液晶板(5)、起偏片(4)、漫射板(3)、场发射显示背光源(9)。场发射显示背光源(9)包括在后玻璃基板(10)与前玻璃漫射板(13)之间制作在后玻璃基板(10)上的阴极电极(11)、阴极发射体(12)，制作在前玻璃漫射板(13)上的荧光粉(14)、阳极电极(15)，形成二极管结构。在后玻璃基板与前玻璃漫射板之间设有控制电极(16)，控制电极可以是独立的，也可以由阴极电极(11)或阳极电极(15)兼，对应相同显示颜色的控制电极连通在一起，形成三极管结构。

A high-resolution liquid crystal display device with a field emission display backlight, relating to a liquid crystal display device with a backlight, especially the backlight technology used in a high-resolution liquid crystal display, the layered structure of the display device is from top to bottom The sequence is: surface reflection film (8), analyzer (7), liquid crystal panel (5), polarizer (4), diffuser plate (3), field emission display backlight source (9). The field emission display backlight source (9) comprises a cathode electrode (11) and a cathode emitter (12) fabricated on the rear glass substrate (10) between the rear glass substrate (10) and the front glass diffuser plate (13), Phosphor powder (14) and anode electrode (15) are fabricated on the front glass diffuser plate (13) to form a diode structure. A control electrode (16) is arranged between the rear glass substrate and the front glass diffuser plate, the control electrode can be independent, or it can be combined by the cathode electrode (11) or the anode electrode (15), corresponding to the control electrodes of the same display color connected together to form a triode structure.

The high-resolution liquid crystal display part of band field emission display backlight source

Technical field

The present invention relates to have liquid crystal display (LCD) device of backlight, particularly the backlight technology that is adopted in the high-resolution liquid crystal demonstration.

Background technology

Liquid crystal display device (LCD) is a kind of passive luminous flat-panel display device, and it comprises reflective and two kinds of forms of transmission-type.Reflective needs utilize could display message under the external environment optical illumination condition.Transmission-type need need add backlight at the back side of liquid crystal flat-panel.Present active Color Liquid Crystal Display adopts transmission-type basically, both added white light source at the liquid crystal display back side, make the corresponding different color cell of different liquid crystal cells by color filter, on-off action by liquid crystal display again, adopt spacing color mixed method, the length of the switching time of control color cell, thereby the demonstration of realization image.It is made up of the structure of a kind of typical TFT (thin film transistor (TFT)) LCD panel backlight fluorescent light, light guide plate, diffusing panel, polarizer slice, TFT liquid crystal board, color filter, checking bias slice, surface reflection film etc.

The LCD backlight mainly adopts cold-cathode fluorescence lamp and light guide plate to realize at present, adds diffusing panel to improve the homogeneity of backlight between backlight and liquid crystal board.Adopt the liquid crystal display of this kind mode, because liquid crystal cells need adopt optical filter, the transmitance of its light is about 30%, is minimum parts of transmitance in the liquid crystal optics assembly, and most of light is absorbed, and therefore greatly reduces the brightness of display screen; In order to improve brightness, general quantity that increases fluorescent light and the transmittance that improves color filter of adopting solves.Increase the quantity of fluorescent light, will improve the power consumption and the volume of display screen undoubtedly, the raising scope of the transmittance of color filter is also very little, can not deal with problems fully.

Field Emission Display is a kind of luminous flat pannel display of utilizing under the highfield of little sharp emitter ejected electron impact fluorescence powder.This display device has that luminescence efficiency height, brightness height, response speed are fast, the characteristics of panelized, utilizes the Field Emission Display principle, can be with its backlight as liquid crystal display.

In order further to improve the resolution and the brightness of LCD panel, employing time color mixing method, three two field pictures of corresponding red, green, blue three looks respectively both a two field picture be converted into, or the multiple image identical in multi-color systems with number of colours, the transmitance of the display unit when being controlled at the different colours frame with a liquid crystal cells realizes the time colour mixture.Owing to adopt a liquid crystal cells to substitute three display units of traditional liquid crystal display, the resolution of demonstration is improved, the optical filter in the LCD panel can be removed simultaneously, increase the transmitance of liquid crystal cells, improve the brightness of LCD panel, reduce cost.Owing to adopt the time colour mixture, under the situation of different colours frame, need the backlight of different colors, because need be in the conversion of color under the scanning situation fast, this be to traditional cold-cathode fluorescence lamp difficulty relatively.But employing field emission display backlight source, because it has high response speed, therefore the Field Emission Display plate can be made the form of light source of red, green, blue three looks, or the polychromatic source form identical with number of color in the multi-color systems, utilize the diffusing panel of LCD panel to make backlight even simultaneously.

Summary of the invention

Technical matters: the purpose of this invention is to provide a kind of high-resolution liquid crystal display part, have high brightness, high-resolution technique effect with the FED backlight.

Technical scheme: in order to realize above purpose, the high-resolution liquid crystal display part of band field emission display backlight source of the present invention, fluorescent light in traditional TFT LCD panel and light guide plate are replaced with field emission plane red, green, blue three look backlights or multicolor backlight source, and do not need chromatic color filter.The field emission display backlight source that is adopted, by certain ranks arrangement mode, its video screen is made into red, green, blue three-color phosphor luminescence unit or the alternate form of multicolor phosphor luminescence unit, the light emitting control electrode of the luminescence unit of each color fluorescent powder correspondence is connected together, the luminescence unit of being controlled this color by the light emitting control electrode is luminous, the luminescence unit that makes same color is lighted when luminous simultaneously in that this color is selected, and the shades of colour timesharing is lighted in turn to provide the time colour mixture needed backlight.The color filter of liquid crystal display can be removed in this case, further improve the brightness of liquid crystal display and reduce cost.

The high-resolution liquid crystal display part of band field emission display backlight source structurally of the present invention, form by diffusing panel, polarizer slice, liquid crystal board, checking bias slice, surface reflection film etc., it is characterized in that: also be provided with the field emission display backlight source that can show multiple color below diffusing panel, the layer structure of this display device order from top to bottom is: surface reflection film, checking bias slice, liquid crystal board, polarizer slice, diffusing panel, field emission display backlight source.

Wherein, field emission display backlight source is included in cathode electrode, the cathode emitter that is produced between back glass substrate and the front glass diffusing panel on the glass substrate of back, is produced on fluorescent powder, anode electrode on the front glass diffusing panel, forms diode structure.

Be provided with control electrode between back glass substrate and front glass diffusing panel, control electrode can be independently, also can be held concurrently by cathode electrode or anode electrode, and the control electrode of corresponding identical Show Color is connected together, and forms audion.When control electrode was not cathode electrode, all negative electrodes of corresponding different colours luminescence unit were connected together; When control electrode is not anode electrode; all anode electrodes of corresponding different colours luminescence unit are connected together; at this moment can on phosphor powder layer, make thin film metal layer again as anode electrode; do not burnt with protection fluorescent powder; improve the electric conductivity of fluorescent powder, improve anode potential and improve brightness.The fluorescent powder that is produced on the anode can be monochromatic fluorescent powder, can be multicolor phosphor also, is generally multicolor phosphor.The shades of colour timesharing of backlight is lighted also in turn and the driving of liquid crystal board matches realizes the time colour mixture of liquid crystal display, the light that field emission display backlight source sent passes through polarizer slice after diffusing panel makes brightness evenly, the polarized light that forms forms image through the transmitance of liquid crystal board control light after checking bias slice makes polarized light by the surface reflection film.

When applying certain voltage between control electrode and the cathode emitter, the cathode emitter emitting electrons, electronics quickens the impact fluorescence powder and makes light-emitting phosphor under electric field action; By certain ranks arrangement mode, fluorescent powder on its front glass substrate is made into monochrome or the alternate form of multicolor phosphor luminescence unit, the light emitting control electrode of the luminescence unit of each color fluorescent powder correspondence is connected together, the luminescence unit of being controlled this color by the light emitting control electrode is luminous, the luminescence unit that makes same color is lighted when luminous simultaneously in that this color is selected, control the voltage on the control electrode of corresponding different glow color fluorescent powder, make the light of field emission backlight emission different colours.

Beneficial effect: use brightness and resolution that this technology can improve liquid crystal display, reduce cost,, can reduce the shared volume of backlight, improve the homogeneity of whole screen brightness owing to adopted the planar backlight source.

Owing to do not need color filter, three luminescence units that traditional liquid crystal display is spacing color mixed can change a luminescence unit of time colour mixture into, improve the resolution of liquid crystal display.

When adopting four looks and above multi-color systems, can make the gamut extension of display image, make image more true to nature.

Description of drawings

Fig. 1 is the structural representation of present TFT liquid crystal.

Fig. 2 is a general structure synoptic diagram of the present invention.

Fig. 3 is that a kind of control electrode of the present invention is the back light source structure synoptic diagram of the three-colour light-emitting of anode.

Fig. 4 is that a kind of control electrode of the present invention is the back light source structure synoptic diagram of the three-colour light-emitting of negative electrode.

Fig. 5 is that a kind of control electrode of the present invention is the back light source structure synoptic diagram of the three-colour light-emitting of absolute electrode.

Embodiment

The structure of field emission backlight can have various ways, can be the extremely above multi-polar structure of diode, triode and four, which kind of version no matter, and it all comprises negative electrode at least, is manufactured with the anode and the luminous control electrode of control luminescence unit of fluorescent powder.

Control electrode can be negative electrode or anode, also can be other control gate electrodes in the three extremely above structures, is used to control the luminous of different colours luminescence unit.

Negative electrode is by cathode electrode and can realize that the emitter material of emission makes, negative electrode can be metal, the semiconductor microactuator point emitter that adopts methods such as evaporation, etching, serigraphy, spraying to make, the flat emitter that field emmision material such as CNT, diamond thin is made, and the cathode emitter that other can emitting electrons under electric field action.The cathode electrode of all corresponding same colors is connected together, and when control electrode was not negative electrode, all negative electrodes of corresponding different colours luminescence unit can be connected together.

Anode is made up of the fluorescent powder of anode electrode and making corresponding different glow colors thereon, and the anode electrode of all corresponding same colors is connected together.When control electrode was not anode, all anode electrodes of corresponding different colours luminescence unit can be connected together, and at this moment can make thin film metal layer again on phosphor powder layer; as the aluminium film; do not burnt with protection fluorescent powder, improved the electric conductivity of fluorescent powder, improve anode potential and improve brightness.The present invention adopts the polychrome field emission backlight, can realize the quick conversion of color, has improved the brightness and the resolution of liquid crystal display.