KR20110008790A - Thermal imaging donor film having an improved light to heat conversion layer and preparing process thereof - Google Patents

Abstract

PURPOSE: A thermal imaging donor film having an improved light to a heat conversion layer and preparing process thereof are provided to improve surface properties by adding magnetic material and liquid magnetic material to a coating solution. CONSTITUTION: A donor film comprises a base substrate(6), a photovoltaic conversion layer(7), and a transfer layer(9). The photovoltaic conversion layer is formed on the base substrate and changes incident light into thermal energy. A photothermal conversion includes a carbon black which is manufactured by mixing or blending nano particles having different diameter and also includes a light absorbing member. A donor film includes the transfer layer with a light-emitting layer and maintains the temperature over the interface between the photovoltaic conversion layer and transfer layer constant.

Description

Thermal imaging donor film having an improved patterning light-to-heat conversion layer and a method for manufacturing the same

The present invention relates to a thermal transfer donor film for a flat panel display device having a photothermal conversion layer of improved patterning, and a method of manufacturing the same, and more particularly, to a photothermal conversion layer by suitably blending light absorbing materials having different sizes of nanoparticles. Thermoelectric for flat panel display elements having a photothermal conversion layer capable of effectively controlling heat by forming a film, and containing magnetic fine particles to provide magnetic convenience in localization / delocalization and operation of a film in a pixel forming process. A four donor film and its manufacturing method are related.

A donor film typically forms an optical element, in particular an organic electroluminescent device, and is used in a thermal imaging process using laser light, including a light to heat conversion (LTHC). Or donor sheet. The thermal imaging process using the laser light is generally referred to as laser induced thermal imaging (LITI).

Generally, the most common pixel formation method of an organic EL device in a conventional flat panel display is a method of forming a light emitting layer in a desired area by arranging a fine metal mask (FMM) in a vacuum chamber with respect to a substrate. In the case of the FMM method, due to the characteristics of the technology, the weight of the mask frame, difficulty in stretching the mask, deflection of the mask itself, expansion due to temperature, etc. are a lot of problems in application of a large area, and thus the organic electric field. In order to form a large area pixel of the light emitting device, a new concept of process technology is required.

In order to meet this need, using the conventional fine metal mask, including the laser light thermal transfer method (LITI) as a representative method that is being studied to replace the method of forming the R, G, B light emitting layer individually, Solution jet ink jet method, white OLED & color filter method, and the like. Among them, the laser technology represented by LITI and LIPS (Laser Induced Pattern-wise Sublimation) or RIST (Radiation Induced Sublimation Transfer) is applied to the donor film (or donor substrate) in which the light emitting layer is formed in advance, and the light emitting layer is separated from the donor film. To be transferred to the acceptor substrate to form pixels. In the case of the LITI process used to form the pixel of the organic electroluminescent element utilizing the donor film (or donor sheet or donor substrate) including the above-described photothermal conversion layer, the thermal transfer method using the donor film and Several ways of making the donor film more efficient have been proposed.

For example, in the method of thermal transfer using a donor film, the method of bringing the acceptor substrate and the donor film into close contact with each other by a conventional vacuum pump is different from the process of manufacturing the organic EL device in the chamber, unlike in the vacuum process. The problem that has not been maintained in the vacuum state of the product has a problem that adversely affects the reliability and life of the product has been raised, so in order to solve the problem, the Korean Patent Application No. 2005-0080349 said "magnetic material on one side on the substrate stage inside the process chamber Positioning a donor film including a permanent magnet layer on the acceptor substrate, a magnetic force acting between a permanent magnet included in the donor film and a magnetic material formed on the acceptor substrate; Laminating the donor film and the acceptor substrate by and on the donor film Laser thermal transfer method comprising a step of transferring at least one region of a transfer layer onto an acceptor substrate by irradiating a laser. The method of manufacturing the donor film more efficiently is, for example, a Korean patent. In the application 2007-0016489, "a donor substrate, its manufacturing method, and the manufacturing method of the organic electroluminescent element using the same", the transfer layer of a donor substrate contains a quantum dot, and the laser induced thermal imaging (Laser Induced Thermal Imaging) is applied to the donor substrate. In order to provide a method of manufacturing an organic electroluminescent device having excellent patterning and excellent luminous efficiency by forming a light emitting layer comprising quantum dots by applying, "preparing a substrate layer; a light-heat conversion layer on said substrate layer And a method of manufacturing a donor substrate for forming a transfer layer including quantum dots on the photo-thermal conversion layer.

By the way, in the prior art including the above invention, the light-to-heat conversion layer which contributes as a decisive energy source for converting light, which is the core layer among the components of the donor film, into heat and transferring the transfer element is a uniform film in the manufacturing method thereof. Alternatively, a non-uniform non-uniform photothermal conversion layer (LTHC) or two layers of LTHC are manufactured, and the closer to the transfer layer, the more sensitive the transfer sensitivity of the transfer layer is through the decrease in concentration, that is, through the concentration gradient of LTHC. Attempts have been made to minimize the effect on the lifetime or efficiency of light emitting devices by the efficiency of pixel formation and efficient thermal temperature control.

That is, referring to FIG. 1, as described in the latter patent invention, a donor film, which is a conventional laser thermal transfer element, includes a base substrate and a light-to-to-light conversion layer. a heat conversion layer, an interlayer, and a transfer layer, the method of forming an organic light emitting layer using a donor film, which is a conventional thermal transfer device, is described in the above-mentioned patent invention. As described above, when the laser is irradiated while the substrate to which the organic light emitting layer is to be formed and the donor film which is the thermal transfer element are brought into close contact with each other, the transfer layer converts the laser light into heat to emit heat. Is transferred to form an organic light emitting layer.

By the way, in the above-described conventional techniques, the thermal transfer sensitivity or the efficient thermal temperature control, that is, the transmission sensitivity is attempted to be controlled only by the concentration gradient of the photothermal conversion layer (LTHC), but it cannot be effectively controlled by such a method. there was. That is, in detail, in the conventional donor film, the uniform concentration of the photothermal conversion layer is unstable due to unevenness due to the thickness that may occur during coating or agglomeration that occurs during the preparation of the coating liquid of the photothermal conversion layer. In the case of forming the organic thin film layer by using, when the laser is irradiated to transfer the transfer layer, the heat generated in the light conversion layer may be excessive, in which case it causes a problem or the characteristics of the transferred organic light emitting layer is changed there was.

Accordingly, the present inventors have made a study of a method for recognizing the problem related to the thermal transfer sensitivity in the prior art and solving the problem. Thus, the present invention has been completed.

Accordingly, an object of the present invention is to solve the above-mentioned problems, and has a novel photothermal conversion layer (LTHC) structure that improves the thermal transfer sensitivity of the transfer layer. It is to provide a thermal transfer donor film.

Another object of the present invention is to provide a thermal transfer donor film for a flat panel display device having an improved patterning photothermal conversion layer exhibiting high transmission sensitivity, small image defects, and the like.

It is still another object of the present invention to provide an easy method for manufacturing a thermal transfer donor film for a flat panel display device having an improved patterning photothermal conversion layer exhibiting the above excellent characteristics.

The present invention can also be easily derived by those of ordinary skill in the art from these objects and the general description of the present specification in addition to the above-described specific objects, and has a flat-panel display element having an improved patterning photothermal conversion layer according to the present invention. It may be aimed at achieving another object such as the use of a thermal transfer donor film.

The thermal transfer donor film for a flat panel display device having an improved patterning light-to-heat conversion layer, which is an object of the present invention, can be produced in a simpler manner than the structure shown in the above-described conventional donor film (donor sheet), but the front surface can be produced. In order to control the temperature evenly, the organic electroluminescent device improves the patterning quality of the transfer layer by minimizing the transfer sensitivity of the transfer layer or the small image defects by generating heat at a higher efficiency than the photothermal conversion efficiency of the conventional light absorber. This is achieved by providing a photothermal conversion layer capable of forming pixels. In addition, in the present invention, photothermal conversion by adding a nano-sized powder-like magnetic material, such as iron oxide, ferrite (Ferrite) to the coating layer of the light-heat conversion layer or blending liquid ferrofluid excellent dispersion stability dispersed in nano-size This means that structural control of the particles inside the layer is possible, that is, the intentional arrangement / dispersion of the internal light absorbing material and the nano-dispersed particles is possible, and after completion of the donor film, the film is handled fairly using the magnetism of the film. The addition of a function that provides convenience provides a fair / technically superior donor film.

An easy method for producing a thermal transfer donor film, which is another object of the present invention, is well dispersed in a liquid in order to provide efficient control of nanodispersed particles, sensitivity of thermal transfer and handling convenience of a film, and ease of structure control of a photothermal conversion layer. The present invention provides a method of forming a donor film using a new photothermal conversion coating liquid in which nano-sized magnetic particles, that is, liquid magnetic bodies are blended into a photothermal conversion layer, or magnetic nanoparticles are well dispersed in a photothermal conversion layer in a powder form. Could be

Thermal transfer donor film for a flat panel display device having an improved patterning photothermal conversion layer for achieving the above object of the present invention;

A base substrate which is a support substrate;

A photothermal conversion layer formed on the base substrate and converting incident light into thermal energy, wherein the photothermal conversion layer is a single coating layer having a different particle size in order to minimize voids in the coating layer using a size gradient and specific surface area difference. Carbon black and other light absorbing materials prepared by mixing or blending nanoparticles; And

A donor film including a transfer layer including a light emitting layer,

The donor film is characterized in that the temperature at the interface between the photothermal conversion layer and the transfer layer is constantly maintained on the entire transfer surface during laser thermal transfer.

According to another configuration of the present invention, the light absorbing material of the light-to-heat conversion layer is characterized in that it is applied to have a uniform concentration and particle distribution in the same way as the base substrate side and the transfer layer side.

According to another configuration of the present invention, the light absorbing material of the light-to-heat conversion layer is characterized in that the average particle diameter size is 200nm or less when nano-dispersed in the form of particles having a particle size of a different size.

 According to still another aspect of the present invention, pigments, dyes, particulate magnetic bodies, and liquid magnetic bodies other than carbon black included in the light absorbing material have an average particle size of 100 nm or less.

According to another configuration of the invention, the light absorbing material of the light conversion layer is characterized in that it comprises an organic binder material that can be cured by ultraviolet light or heat.

According to another configuration of the invention, the donor film is characterized in that it further comprises a protective layer (Interlayer) comprising an organic binder and a binder of acrylic and urethane-based to protect the light-heat conversion layer.

According to another configuration of the present invention, the light absorbing material of the light-to-heat conversion layer is characterized by absorbing light generated from one laser selected from an infrared laser, visible laser and ultraviolet laser.

According to another configuration of the present invention, the light absorber constituting the light-to-heat conversion layer is characterized in that the two or more light absorbers having different particle size, specific surface area and blackness is unlocalized in a single film of the same coating layer. It is done.

According to another configuration of the present invention, one of the light absorbers of different particle sizes constituting the light-to-heat conversion layer exhibits magnetic properties, and at least one material selected from particulate magnetic material, ferrite and ferrofluid. It is characterized by that.

Method of manufacturing a thermal transfer donor film for a flat panel display device having an improved patterning photothermal conversion layer for achieving another object of the present invention described above;

On the copolyester-primed PET film, carbon black and other light absorbing materials are prepared by blending nanoparticles of different particle size in order to minimize voids in the coating layer by using size gradients and specific surface area differences. Forming a photo-thermal conversion layer by coating the coating solution containing the photo-thermal conversion layer, by using the thermal evaporation to form a transfer layer comprising a green / red / blue light emitting layer to a predetermined thickness.

According to another configuration of the present invention, in order to protect the light-to-heat conversion layer, a protective layer (Interlayer) containing an organic binder and a binder of acrylic and urethane-based (Interlayer) is further formed between the light-heat conversion layer and the transfer layer.

The thermal transfer donor film for flat panel display devices having the improved patterning photothermal conversion layer of the present invention configured as described above is coated with a coating liquid blended with light absorbers having different particle size sizes on a base substrate to form a photothermal conversion layer. In addition, the inclusion of a magnetic material and a liquid magnetic material in the coating solution, in particular, minimizes voids in which the nano-dispersed particles of the light absorber are more delocalized, thereby improving the transfer patterning quality of the transfer layer and improving the surface properties. In addition, it is possible to express a uniform temperature profile in the entire region of the photothermal conversion layer. In addition, in manufacturing the thermal transfer donor film, the photothermal conversion layer can be formed by coating in one step, thereby providing convenience in the manufacturing process.

Hereinafter, the present invention will be described in more detail by preferred embodiments with reference to the accompanying drawings, but the scope of the present invention is not limited thereto.

2 is a cross-sectional view showing the structure of a donor film according to an embodiment of the present invention, including a heat-transfer layer or a magnetic / liquid magnetic body in which the nano-dispersion particles of the present invention are well controlled as a uniform film on a plastic base substrate. FIG. 3 is a cross-sectional view illustrating a structure in which the light absorber of the photothermal conversion layer is nanodispersed controlled, and FIG. 4 illustrates blending of different nanoparticles. It is a structural sectional view of the photothermal conversion layer formed using the photothermal conversion coating liquid manufactured through.

As shown in the figure, the donor film according to the preferred embodiment of the present invention is a base substrate 6, which is a support substrate, the coating formed on the base substrate converts the incident light into thermal energy, and includes a light absorbing material A photothermal conversion layer 7, an intermediate layer 8 for preventing contamination of the transfer layer and improving surface roughness, and a transfer layer 9 for forming an image are included.

According to a preferred embodiment of the present invention, the light absorbing material of the light-to-heat conversion layer 7 has a uniform concentration distribution, and nanoparticles having different particle size sizes are blended and stably nanodispersed. Herein, it is preferable that the average particle size of the nanoparticles having different particle size be 200 nm or less. If it exceeds 200 nm, it shows low dispersion uniformity, so that the patterning quality is not good, which is not preferable.

In the case of the base substrate 6 which serves as a mechanical support in the lowermost layer of the donor film according to the present invention, the substrate may generally be glass, transparent film or polymer film. One suitable type of polymer film is preferably a polyester film, for example, a high transmittance universal polymer film such as polyethylene terephthalate (PET) or polyethylene naphthalate (PEN) film. In order to be used as the base substrate 6 of the donor film according to the present invention, it should be able to have a wide range of transmittance as well as mechanical / thermal properties, in particular according to the organic binder resin used in the photothermal conversion layer (LTHC; 7). It should be possible to have a primer layer that can control the adhesion at the interface between the base substrate 6 and the photothermal conversion layer (7). Typically, the material used to form the substrate 6 of the donor film and any adjacent layer improves the adhesion between the base substrate 6 and the adjacent layer, and the temperature between the base substrate 6 and the adjacent layer. It may be selected to control the delivery and to control the image forming radiation delivery to the photothermal conversion layer 7.

As an example of the film for the base substrate 6 which satisfies the above basic physical properties and has excellent adhesion with the photothermal conversion layer 7, the product number XU series / XG series (Toray Saehan, Gumi, Gyeongsangbuk-do, Korea) Optical / graphic films such as Toraysaehan Inc.).

The light absorbing material for forming the photothermal conversion layer 7 coated on the base substrate 6 serving as the supporter of the donor film is generated from one laser selected from incident radiation such as infrared laser, visible laser and ultraviolet laser. The light-to-heat conversion layer 7 absorbs light, and the light absorbing material selected from carbon black, metal, infrared pigments and pigments, which absorb infrared rays, and generates heat energy, and an organic binder material which is curable by ultraviolet rays or heat. Include.

The image forming radiation absorber material of the organic thin film layer, which is the transfer layer 9, is present in the thermal transfer donor film at a level sufficient to provide selected image forming radiation absorbing properties and optical absorption at the image forming radiation wavelength.

Typical radiation absorbing materials can include carbon black, metal oxides, and metal sulfides. Typical photothermal conversion layer 7 may include a pigment such as carbon black and a binder such as an organic polymer. Photothermal conversion layers known in the art to which the present invention pertains include UV-curable resin systems and carbon black pigment dispersions as small particulate absorber materials. Carbon black is inexpensive, stable, easily processed and absorbs at near infrared (NIR) imaging laser wavelengths of 808 nm and 1064 nm.

In the case of a light absorbing material such as carbon black, which plays a key role in absorbing the incident radiation and converting it into thermal energy among the elements constituting the light-to-heat conversion layer 7, as shown in FIG. Even in the form of controlled particles of a certain size, ie nanosized. However, in the case of the light absorbing material during the coating process, as shown in FIG. 3, there is a high possibility of localization due to coagulation between particles and errors in the coating process. When the light absorbing material is localized, efficient temperature control becomes difficult. Nonuniform photothermal conversion occurs due to localization of the light absorbing material, resulting in uneven surface temperature. That is, the temperature is abnormally high at the localized portion, so that the film transfer nonuniformity occurs during the transfer of the organic thin film layer, which is the transfer layer 9, which may eventually appear as a defect of the organic electroluminescent device.

Therefore, according to a preferred embodiment of the present invention, by dispersing and blending carbon black particles having particle sizes of different sizes, it shows a wide range of pores according to the distribution of particles of uniform size as shown in FIG. As shown in Fig. 4, the patterning quality of the organic thin film layer, which is the transfer layer 9, is minimized by minimizing the uneven surface temperature due to the localization of carbon black, that is, the light absorbing material, so as to be within a narrow void range. Significantly improves transcription characteristics.

As described above, the meaning of blending nano-dispersed particles of different sizes according to the present invention is to simply improve the light absorption rate and the thermal conversion rate by simultaneously expanding the specific surface area of the light absorber in addition to minimizing voids to form a dense single layer. It makes an effect to make. This means that the light absorbency and optical density of the light-to-heat conversion layer, which were simply adjusted by the weight% of the light absorbing material, can be sufficiently controlled through a gradient particle size at the same concentration. In addition, the light absorbing material having different sizes may be powder-like magnetic particles or ferrites having magnetic properties, or ferrofluids having liquid and magnetic properties. This provides an easy way to more easily delocalize the structure of the nano-dispersion particles that can be localized when forming the photothermal conversion layer. That is, as shown in FIG. 4, since the nano-dispersions 13 and 14 forming the photothermal conversion layer 12 after coating are composed of particles of different sizes, nuclei can be formed by interaction between these dispersions. This is because the internal particles constituted in this way can be uniformly delocalized at the time of forming the photothermal conversion layer by an application material having magnetic properties. Ultimately, both the blended photothermal conversion layer of the different nanoparticles including the above-mentioned magnetic body or the blending photothermal conversion layer without the magnetic body are transferred to the transfer layer 9 by minimizing the voids with a uniform distribution of the inner nanodispersion particles. The temperature is controlled in the same way by the laser even in the minute area to be obtained, thereby obtaining a high quality patterning characteristic in which no edge defects appear at all.

In general, in the case of organic pigments such as carbon black, it may be difficult to disperse as the specific surface area becomes larger, and when the particle size is different, the black color may also be different. It should be selected appropriately in consideration of specific surface area ratio and blackness. Therefore, according to a preferred embodiment of the present invention, when carbon black particles are used as the light absorbing material of the photothermal conversion layer, those having an average particle size of 150 nm or less are used.

As described above, the smaller the specific surface area is, the more advantageous when the nano-dispersed particle carbon black is selected, and the average particle size is preferably 200 nm or less. Therefore, it is preferable to mix and use carbon black (CB) 18 and 26 at an appropriate ratio. In particular, the ratio is preferably CB 18: CB 26 = 2: 4.

As shown in the figure, the transfer layer 9 is typically included in a donor film (or donor sheet). Such a transfer layer 9 may be coated in a uniform layer, for example by thermal deposition, sputtering or solvent coating, spin coating or digital printing (e.g., For example, digital inkjet or digital electrophotographic printing), lithography printing, or printing in a pattern using deposition or sputtering through a mask, is generally formed by placing on the photothermal conversion layer (7). As mentioned above, other optional layers, for example a protective layer 8, may be interposed between the optional photothermal conversion layer 7 and the transfer layer 9. In addition, the transfer layer 9 typically includes one or more layers for transferring to the receptor. These layers can be formed using organic, inorganic, organometallic and other materials, including, for example, electroluminescent materials or electrically active materials.

Hereinafter, the configuration and effects of the present invention will be described in more detail with reference to Examples and Comparative Examples. However, this embodiment is intended to illustrate the present invention in more detail, of course, not intended to limit the scope of the invention to these examples.

Examples 1-3

On the copolyester primed 100㎛ PET film, the coating solution of CB18 / CB26 / CB30 nanodispersed blended photothermal conversion layer shown in Table 1 was applied at 3.5 μm, and the acrylic intermediate layer was coated at ≦ 1 μm. The thermal light emitting layer Alq3 (Tris (8-hydroxyquinolinato) aluminium) is deposited to a thickness of 1200Å by thermal evaporation, and the thermal transfer donor film thus produced is 70W to 130W energy using a laser of Nd: YAG 1064nm of LITI process. Was transferred. As a result, all of the donor films produced according to Examples 1 to 3 were able to obtain a clean transfer patterning quality as shown in FIG.

Example 4

CB26 was separately prepared on the 100 μm PET film subjected to the copolyester-priming, and the nano-dispersion photothermal conversion layer coating solution was prepared and coated at 3.5 μm, and the acrylic intermediate layer was coated at ≦ 1 μm. On top of that, the thermal emission donor film was deposited by thermal evaporation to a thickness of 1200Å with a light emitting layer Alq3 (Tris (8-hydroxyquinolinato) aluminium), and the energy of 70W to 130W was obtained using Nd: YAG 1064nm laser of LITI process. Was transferred. As a result, in the case of CB26 it was possible to obtain a clean transfer patterning quality as shown in Figure 7 in a specific energy range.

Comparative Example 1

The same procedure as in Example 4 was carried out except that CB18 was used instead of CB26. As a result, in the case of CB18, the patterning quality as shown in FIG. 6 was obtained in the entire energy region.

This can be found in the average particle size, which can be seen as a measure of nanodispersion of CB26 and CB18, compared to Example 4. CB26 had an average particle size of about 120 nm and a dispersion in a narrow range, but CB18 showed an average particle size of about 320 nm and a wide range of dispersion due to large specific targets. In addition, the larger the particle size is about 2% of more than 2㎛ is included because of this low dispersion uniformity seems to be poor patterning quality.

Comparative Example 2

The nano-dispersed photothermal conversion layer coating solution of CB30 was applied at 3.5 μm on the copolyester-primed 100 μm PET film, and the acrylic intermediate layer was coated at ≦ 1 μm. On top of that, the thermal emission donor film was deposited by thermal evaporation to a thickness of 1200Å with a light emitting layer Alq3 (Tris (8-hydroxyquinolinato) aluminium), and the energy of 70W to 130W was obtained using Nd: YAG 1064nm laser of LITI process. Was transferred. As a result, transfer patterning quality of poor quality as shown in FIG. 6 was obtained.

division Example 1 Example 2 Example 3 CB 18 One 2 CB 26 3 4 CB 30 5 6

* CB 18; Specific Surface Area: 64, Blackness Index: 128

CB 26; Specific Surface Area: 98, Blackness Index: 155

CB 30; Specific Surface Area: 168, Blackness Index: 168

Average Dispersion of Nano-Dispersed Particles Blended Photothermal Conversion Coatings of Different Sizes: Measurement of Particle Size Analyzer (ELS-8000) division CB18 CB26 CB30 CB18 +
CB26 CB18 +
CB30 CB26 +
CB18 CB26 +
CB30 CB30 +
CB18 CB30 +
CB26 Average particle diameter
(nm) 320 120 183 175 210 150 137 235 194

1 is a cross-sectional view showing a structure of a conventional general donor film including a photothermal conversion layer (LTHC) of two layers of non-uniform or non-uniform film on a plastic base substrate, a protective layer (Interlayer), and a transfer layer on the uppermost layer,

2 is a cross-sectional view showing the structure of a donor film according to an embodiment of the present invention, including a heat-transfer layer or a magnetic / liquid magnetic body in which the nano-dispersion particles of the present invention are well controlled as a uniform film on a plastic base substrate. A conversion layer, a protective layer and a transfer layer thereon;

3 is a cross-sectional view showing a structure in which the light absorbing material of the light-to-heat conversion layer is nano-dispersed controlled,

4 is a cross-sectional view of a structure of a photothermal conversion layer formed using a photothermal conversion coating solution prepared by blending different nanoparticles,

FIG. 5 illustrates the surface image of the photothermal conversion layer according to how the nano-dispersion control of the coating liquid forming the photothermal conversion layer is performed. In FIG. 5A, the light absorber aggregates and is displayed on the surface in a particle shape. In the case of Figure 5b is a light absorber is well dispersed in the form of nanoparticles showing a clean surface,

FIG. 6 illustrates a transfer image when the transfer layer is transferred to a donor film when the nano-dispersed particles are aggregated as shown in FIG. 5A or the particle dispersion of the photothermal conversion layer is uneven.

FIG. 7 is a light absorbing material well dispersed in the form of nanoparticles as shown in FIG. 5B, and the surface is clean, and when the transfer layer is transferred to a donor film prepared by controlling the structure of the light absorbing particles with a magnetic / liquid magnetic body. The transcription image that appears is displayed.

* Explanation of symbols for the main parts of the drawings

1, 6: Plastic base substrates 2, 3, 7: Photothermal conversion layer (LTHC)

8, 4: interlayer 9, 5: transfer layer

10, 12: photo-thermal conversion layer 11, 13, 14 after coating: nano dispersion

Claims (11)

A base substrate which is a support substrate; A photothermal conversion layer formed on the base substrate and converting incident light into thermal energy, wherein the photothermal conversion layer is a single coating layer having a different particle size in order to minimize voids in the coating layer using a size gradient and specific surface area difference. Carbon black and other light absorbing materials prepared by mixing or blending nanoparticles; And A donor film including a transfer layer including a light emitting layer, The donor film is a thermal transfer donor film for a flat panel display device having a light-to-heat conversion layer of the improved patterning, characterized in that the temperature at the interface between the light-heat conversion layer and the transfer layer during the laser thermal transfer is kept constant. The flat panel display of claim 1, wherein the light absorbing material of the photothermal conversion layer is coated to have a uniform concentration and particle distribution on the base substrate side and the transfer layer side. Thermal transfer donor film for devices. The flat panel display device of claim 1, wherein when the light absorbing material of the light-to-heat conversion layer is nano-dispersed in the form of particles having particle sizes of different sizes, the average particle size is 200 nm or less. Thermal transfer donor film. The method of claim 1, wherein the pigment, dye, particulate magnetic material, liquid magnetic material (Ferrofluid) other than the carbon black included in the light absorbing material having a light-to-heat conversion layer of improved patterning, characterized in that the average particle size of less than 100nm Thermal transfer donor film for flat panel display elements. The thermal transfer donor film of claim 1, wherein the light absorbing material of the light conversion layer comprises an organic binder material that is curable by ultraviolet rays or heat. The method according to claim 1, wherein the donor film further comprises a protective layer (Interlayer) comprising an organic binder and a binder of acrylic and urethane-based in order to protect the light-heat conversion layer having a light-heat conversion layer of improved patterning Thermal transfer donor film for flat panel display elements. The flat panel display of claim 1, wherein the light absorbing material of the photothermal conversion layer absorbs light generated from one laser selected from an infrared laser, a visible light laser, and an ultraviolet laser. Thermal transfer donor film for devices. According to claim 1, wherein the light absorber constituting the light-to-heat conversion layer is improved, characterized in that two or more light absorbers having different particle size, specific surface area and blackness is unlocalized in a single film of the same coating layer. A thermal transfer donor film for flat panel display devices having a patterned photothermal conversion layer. The method of claim 1, wherein one of the light absorbers having different particle sizes constituting the light-to-heat conversion layer is characterized by magnetic properties, characterized in that at least one material selected from particulate magnetic material, Ferrite, Ferrofluid. A thermal transfer donor film for flat panel display elements having an improved patterning photothermal conversion layer. On the copolyester-primed PET film, carbon black and other light absorbing materials are prepared by blending nanoparticles of different particle size in order to minimize voids in the coating layer by using size gradients and specific surface area differences. The light-to-heat conversion layer of the improved patterning, characterized in that to form a photo-thermal conversion layer by applying the coating solution containing the photo-thermal conversion layer, and to form a transfer layer comprising a green light emitting layer to a predetermined thickness by thermal evaporation thereon The manufacturing method of the thermal transfer donor film for flat panel display elements which have. 11. The method of claim 10, further comprising forming an interlayer between the light-to-heat conversion layer and the transfer layer, the protective layer (Interlayer) comprising an organic binder and a binder of acrylic and urethane-based to protect the light-to-heat conversion layer. The manufacturing method of the thermal transfer donor film for flat panel display elements which has a photothermal conversion layer.

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