TWI292494B - Dye based circularly polarizing film for organic light emitting diodes - Google Patents

Description

1292494 IX. Description of the Invention: [Technical Field] The present invention relates to an organic light-emitting diode display (OLED) capable of reducing power consumption (or improving brightness under the same power consumption condition) under the same brightness Circular polarizer and method of manufacturing the same. [Prior Art] In the prior art, as an anti-reflection polarizing film in an organic light emitting diode display, an iodine intermediate gray polarizing plate (polarizing film) having a light transmittance of 42 to 43% is used. An anti-reflection film that is combined with a quarter-wave plate, that is, a circularly polarizing film. However, although the circular polarizer can shield the light from the outside, and when the photons generated by the organic light-emitting layer pass through the polarizing film layer having an average light transmittance of 42 to 43%, only 42 to 43% pass, and thus, The circular polarizer reduces the external quantum efficiency and the brightness also decreases. Worldwide, the display market is being adapted from a digital flat panel display. Among them, the organic light-emitting diode display has a fast response speed of 'self-illuminating characteristics, and does not need to use a backlight module and a color filter that emits light behind to make its thickness and weight respectively 1/3 of the TFT-LCD. Left and right, it can also reflect the bright enamel and natural movement, so that in the entire display field of mobile display, it is known as the epoch-making device that can overcome the shortage of LCD. But OLEDs need to be studied to improve brightness. Increasing the brightness of the 〇led component is more important than other types of displays. That is 5

The 1292494 reduces the number of illuminating elements such as the mobile 4 LCD / Α 4, and also increases the life. However, it is not necessary to consider that almost all of the light emitted by the outside I can be emitted outside, so the factors such as *, Bu 4 lining efficiency. X 0LED is a representative point light illuminating element 'the internal quantum efficiency of the photon generated by the point - "multiple layers of the illuminance and the outer part of the illuminance" is an important index. In terms of OLED components, σ & 20 % ή6 * jr ^ , 丨丁水° brother, /, has about, 纟 outside. Therefore, as long as the light that is absorbed inside can be guided to the outside, it is important for improving brightness. 1 OLED & Pieces have important optical meanings in the application of mobile electronic products: In the optical characteristics of mobile electronic components, the reflection caused by external light: the impact of non-stealing image quality, contrast (Contrast rati0) is very important. Contrast' organic light-emitting diode display mounts a polarizer (polarized film) with a single transmittance of 42 to 43% for a full-wavelength of visible light and a non-reflective film 'a circular polarizer' for 1/4 of the visible light The light is formed in a non-reflective state. At this time, although the reflection caused by the external light can be suppressed, the photon generated by the LED light-emitting element has only the average single sheet corresponding to the sheet when passing through the circular polarizer. The light transmittance, that is, the amount of 42 to 43%, passes through and is emitted to the outside, so that when passing through the circular polarizer, the external quantum efficiency is correspondingly lowered. In the conventional organic light-emitting diode display, in order to control the reflected light of the incident light from the outside In order to increase the contrast, a single circular polarizer having a visible light transmittance of about 42 to 43% is generally used, so that the external quantum efficiency in the circular polarizer is correspondingly reduced. [Invention] 6 1292494 The above problem is aimed at reducing the power consumption by increasing the external quantum efficiency (brightness ratio) by 25 to 37% in the organic light-emitting diode (hereinafter referred to as OLED) +. The conventional circular polarizer having a visible light transmittance of 42 to 43% is replaced by a circular polarizer capable of selecting, absorbing and shielding a visible light region of a specific wavelength, thereby improving the average transmittance of visible light to a single piece. 53~59%, so that the external quantum efficiency is improved by 25~37% under the premise of ensuring that the contrast of the LED is not significantly reduced, thereby effectively reducing the mobile organic light-emitting diode The power consumption of the display device and the service life of the LED are significantly improved. The inventors have found that the phenomenon of bright vision (Ph〇t〇pic visi〇n) and the three primary luminescent colors of 〇LED, G in R, G, B The luminous efficiency of (Green) is particularly south, and the specific wavelength region of the natural light incident on the circular polarizer layer is selectively absorbed and shielded, so that the monolithic transmittance of the full-wavelength of visible light is increased to 53 to 59%. It does not have a significant effect on the visual contrast. This greatly improves the phenomenon that the light generated by the LED light-emitting layer is shielded in the polarizing film layer, and the external quantum efficiency (brightness increase effect) is improved by 25 to 37. %. That is, the present invention provides a high transmittance circular polarizer capable of shielding a specific wavelength, that is, by processing a specific wavelength (5 〇〇 to 64 〇 nm), the visible light transmittance is 53 to 59. % of the circular polarizer replaces the circular polarizer with a visible light transmittance of 42 to 43% on the existing organic light-emitting diode display, thereby increasing the external quantum efficiency by 25 to 37%, correspondingly lowering The amount of power required to reflect the same brightness. 7 1292494 A dye-based circular polarizer for an organic light-emitting diode display of the present invention is formed of a polarizing film made of polyvinyl alcohol as a basic material and a quarter-wave plate, and the polarizing film is a color polarizer, which is matched with a high-grade polarizer. The dye of the color dye is dyed and stretched to have a main absorption wavelength band of 80 to 120 nm in the absorption wavelength range of 500 to 640 nm, and an average single-chip transmittance of 53 to 380 nm in the visible wavelength range of 380 to 780 nm. 59%. The invention is mounted on an organic light emitting diode display, absorbs and shields incident light to the outside, and performs a circular polarizer which plays a decisive role in contrast from the existing visible light wavelength (38〇~78〇ηηη). The absorbing treated circular polarizer is replaced by the circular polarizer of the present invention which effectively processes a specific wavelength', thereby improving external luminous efficiency (increasing brightness) and correspondingly reducing power consumption, overcoming the maximum of the existing organic light emitting display Defects, short life issues. Specifically, the conventional circular polarizer is composed of an iodine polarizing film that absorbs and shields the entire visible light wavelength (3 80 to 78 Onm). In the present invention, the polarizing film 1 in FIGS. 2 and 2 uses a dye-based polarizing film which concentrates light having a wavelength band of 8 〇 to 12 〇 nm in a wavelength range of 5 〇〇 to 640 nm in visible light. The absorption and shielding are performed while the remaining visible light region is finely adjusted to about 10% of the above specific wavelength so that the average visible light transmittance is 53 to 59%. In addition, it is replaced by an AG/LR (Anti Glare / Low Reflection) film having anti-glare (Anti Glare) or low reflection (both low reflection) or both of the above functions; One side of the triacetate cellulose film 2A, and then pasted on the above 8

1292494 1/4 wave plate 3 with a certain phase difference at a specific wavelength. In this way, it has high transmittance and compensates for the insufficient external light shielding effect. By reducing the contrast difference, the problem of poor visual contrast is solved, and the three primary colors are realized by limiting the G-light wavelength region with the highest luminous efficiency. The coordination of the luminous efficiency of light and the improvement of the efficiency of white light. However, the twilight is slightly purple to green, but this feature has different effects from other products and can increase the value of the product. That is, the circular polarizer on the organic light-emitting diode display of the women's wear has a single-piece light transmittance of 42 to 43% for the entire visible light wavelength, and is the same throughout the visible light wavelength. Thus, when the photons generated in the organic light-emitting layer pass through a circular polarizer having a light transmittance of 42 to 43%, only about 42 to 43% of the photons are emitted to the outside, and the remaining 5 7 to 58 % are shielded. The inventors have found that by selecting a polarizing film dye to control the absorption rate of a specific wavelength band, the average light transmittance of the above circular polarizer can be increased from 42% to 53% to 59%, thereby increasing the generation. The photon emitted by the photons of the organic light-emitting layer to the outside increases the external quantum efficiency (removing the brightness). The specific wavelength to be limited, that is, the main absorption wavelength band is 5 〇 to 640 nm, the monolithic transmittance in this region is 43 to 48%, and the average single-chip transmittance of the entire visible light wavelength is 53 to 59%. These effects are based on two reasons. First, according to the light vision efficiency of the cone-shaped cells for sensing light in the human retina, that is, the principle of bright vision. According to this principle, human vision has the largest optical efficiency in visible light of 550 nm wavelength, and as a result, its optical efficiency decreases sharply along both the short wavelength and long wavelength directions. For example, if the optical efficiency of the wavelength of 550 nm is set to 〇, then the optical efficiency of the wavelength range of 400 to 46 〇 nm and 660 to 7 〇〇 nm is 〇$9 1292494 or less, and the optical range of 470 to 710 nm and 620 to 660 nm is obtained. The efficiency is around $~4_0. That is, in the entire visible light region (4 〇〇 to 7 〇〇 nm), the region of 51 〜 to 620 nm is the region with the highest optical efficiency, and the optical efficiency is 2.5 times to 1 〇〇 times that of other wavelength regions. The inventors inversely compare the optical efficiency, and correspondingly increase the wavelength region of low or negligible optical efficiency, that is, the transmittance of the region of 400 to 500 nm and 64 〇 to 700 nm, thereby transmitting the full wavelength of visible light. The rate is increased from 2% to 53% to 59%, and one side of the triacetylcellulose film adhered to both sides of the above polarizing film 1 is replaced by a /LR film having both anti-glare and low-reflection functions (the external natural light incident side) ), so that the resulting brightness ratio reduction effect is minimized. In the second wavelength region, the light transmittance of the G (green) light wavelength region with high luminous efficiency among the r, 〇, and B rays of the organic light-emitting diode can be adjusted, and the value is the main color of the green light. The light transmittance in the wavelength region of 500 to 580 nm is 40 to 48%, so that the external quantum efficiency of the full wavelength of visible light is more uniform. Specifically, the green light having a relatively high light efficiency is in the circular polarizer T. The light transmittance is equal to or slightly higher than that in the prior art, and the light transmittance in other wavelength regions is increased from the existing light transmittance of 42 to 43% to 49% or more. The core of the present invention is a circular polarizer formed by polarizing film 1 and cellulose diacetate film 2 A and i / 4 wave plate 3 which is limited to a specific wavelength of 500 to 640 nm, which is used for organic light emitting diodes. On the body display, the installation sequence is shown in Figure 2. The characteristics and composition of each film in Fig. 1 will be described in detail below. 10 1292494 疋 疋 wavelength 500~640nm In the first picture, there is no film 1 at the wavelength, the film will be ~ 2 kinds, in special cases, three kinds of high dichroic dyes as polarizer 'in polyvinyl alcohol (PVA) film Dyeing and stretching and fitting the pots. When selecting a high dichroic dye, consideration should be given to operational safety, reproducibility, desired brightness rise rate, contrast, organic illuminant characteristics, and ◦ (4) structural factors. When manufacturing the dye polarizing film, in order to increase the polarized light as much as possible = = the elongation ratio is required to be 5 % or more. Extension method High dichroicity % The above-mentioned specific wavelength limiting polarizer (polarizing film) Describes the relevant dye: The chemical structural formula of the material and the dye group are as follows. In addition, the dyes of the oxime group will be described later using the chemical structural formula number and the dye group. [Chemical Formula 1] Η〇3«-^\

NH

Chemical formula 2

—<〇> 11 1292494 Group B dye: [Chemical Formula 3]

[Chemical Formula 5]

Group C dye: [Chemical Formula 6]

12 1292494 [Chemical Formula 7]

[Chemical Formula 8]

«<:^Η [Chemical Formula 9]

13 1292494 [Chemical Formula 1 ο]

When using a ruthenium dye, it is preferable to use a dichroic dye of Chemical Formulas 1 and 2 in order to limit the wavelength of 5 ο ο 6 6 Ο n m . At this time, the main dye is the dye of Chemical Formula 1, and 85 to 90% by weight of the dye of Chemical Formula 1 and 1 to 15% by weight of the dye of Chemical Formula 2 are mixed and dyed onto the t-ethyl alcohol film. After the film was stretched from 50 to 600%, it was dried to produce a polarizer (polarizing film) 1. At this time, one of the dyes in Groups 7 to 1 of Group C can be selected and mixed in a ratio of 5 to 10% by weight based on the main dye to adjust the light transmittance at a wavelength of 65 Å to 70 00 nm. The dyes of Chemical Formulas 3 to 5 of Group B are not required to be mixed with other dyes, and a dye-based polarizing film having the object and properties of the present invention can be produced by using a single dye. It is also possible to adjust the color tone by slightly adjusting the wavelength in the range of 5 〇〇 to 64 〇 nm by using a dye of Chemical Formula 1 or Group C Chemical Formula 6 of 1% by weight or less as needed. At this time, the use of Chemical Formulas 7 to 1 in the Group C dye is as in the above example, and the light transmittance at a wavelength of 65 Å to 7 Å is appropriately adjusted as needed. The dye-based polarizing film produced by the above dye is in the range of 500 to 640 in the main absorption wavelength region, and the single-piece light transmittance is limited to a certain range, and the light transmittance of the bias 14 1292494 exceeds the standard value. Preferably, the monolithic transmittance (Tv, %) in the 500 to 64 Onm region is 43 to 48%, and the polarizing ratio is 88% or more. The monolithic transmittance is determined by the main absorption wavelength of the selected dye, and the monochromatic transmittance of the full wavelength of visible light is 53 to 59%. The visible light transmittance of the full wavelength of visible light is preferably 85% or more. In the present invention, a polarizing film for concentrating absorption and shielding of light in a wavelength range of 500 to 64 〇 nm is used in place of the polarizing film used in the organic light-emitting diode display, instead of the existing 38 〇 to 78 〇 nm. The circular polarizer with a single average transmittance of 42 to 43% in visible light has an average visible light transmittance k of two to 53 to 59%, so that the amount of photon light emitted from the light-emitting layer is 42 to 43%. Increase to 53~59%. The above-mentioned wavelength region is 3 to 1 times higher than the other wavelengths, and the effect is achieved by the following means. In other words, the reflected light of the wavelength region and the entire wavelength of the visible light is collectively shielded, and the phenomenon of relative contrast is reduced as much as possible. At the same time, the external light-emitting effect of the green organic light-emitting photon having high luminance is appropriately limited, and the red color is improved. And the wavelength transmittance of the blue organic illuminant. In this way, the circular polarizer of the present invention is mounted on the organic light-emitting diode (OLED), which can increase the external quantum efficiency of 25 to 37% d, or can reduce the power consumption by 25 to 37% under the same brightness, thereby increasing使用寿命 LED life. [Embodiment] The structural relationship of the present invention will be described in detail below with reference to Figs. 1 and 2 . 15 1292494 Fig. 1 2A and 2B are = J-cellulose acetate (TAC) films adhered to both sides of the PVA polarizing film 1, and have a thickness of 50/zm or less, and the thinner the better. Among them, the film 2A on the incident side of the external natural light 210 is a TAC film having an anti-glare (Anu Glare) or an anti-glare/low reflection (Low Reflection) function or a low reflection (Low Reflection) function to improve contrast. 3 in the first and second figures is a quarter-wave plate, that is, an r /4 retardation film. This film causes the light 220 incident on the dye-based polarizing film 1 to be polarized and polarized to be rotated by 90 degrees when it is reflected by the metal piece (cathode) 100. Specifically, the 7/4 retardation film crosses light rays incident on the polarizing film 1 and polarized, thereby being shielded from the polarizing film layer. In this case, the r value is the main absorption wavelength of the dichroic dye used, and its value is usually 500 to 640 nm. The light-emitting layer 110 of the anode plate 120 and the cathode plate 1〇〇 treated by the ITO film on the glass substrate emits light. The upper portion of the polarizing film 1 is covered by a polyester substrate protective film 4 which is prevented from being electrostatically treated. On the other hand, a release film (release film) is formed on the bottom, and these films are pasted with the adhesive 6, thereby forming a circular polarizer for a specific wavelength control for an OLED. Hereinafter, the present invention will be described in detail by way of examples. [Example 1] The circular polarizer of Example 1 was produced by the following steps. (1) Water washing A 20,000 g of normal temperature water was added to a 25 000 ml washing tank, and a polyvinyl alcohol (PVA) having a width of 310 mils (Kuraray product, trade name VF-P# 7500) was thoroughly washed for two minutes. 16

1292494 (2) 24,000 g of water was added to a swelling tank of 30,000 ml and heated to 35 degrees, and the PVA film subjected to the above (1) water washing step was allowed to stand for 1 minute and 30 seconds to be swollen. (3) Dichroic dye (polarizing agent) dyeing In a 20 000 ml dissolution tank, 265 g of the dye of Chemical Formula 1 of the above Group A and 20 g of the dye of Chemical Formula 2 were added, and heated to completely dissolve. The solution was transferred to a 90,000 ml dyeing tank and 50,000 grams of warm water was added. Here, 700 g of sodium sulphate was added to completely dissolve it and then cooled to 42 °C. The film swelled by the above procedure was placed in the dyeing tank and dyed for 3 minutes. (4) Washing 300 ml of the cleaning tank is filled with normal temperature water, and the film dyed by the dyeing tank is placed in the cleaning tank, and washed for 15 seconds to clean the surface dye. (5) Fixing color In the 90000 ml fixing tank, put 80000 g of water and ι7 gram of shed acid and raise the temperature to 40 degrees to completely dissolve the boric acid. The dyed film was placed in the fixing tank for 3 minutes to fix the dyed dye to PvA. (6) Extending the preparation of the same solution as the above-mentioned fixing tank 'extends 5 〇〇% in the solution 7(7) Washing 70,000 liters of the second cleaning tank is filled with normal temperature water, soaking the above-mentioned extended membrane 1 〇 second. To clean the stretch film. 17

1292494 (8) Dehydration and drying, and the above-mentioned cleaned film was subjected to maximum dehydration by a dewatering roll, and then the film was dried for 40 seconds using a 95-degree hot air dryer. (9) Adhesive-1 A 3 % polyethyl alcohol solution was used as a binder, and the above-mentioned dye-extended PVA film was adhered to an anti-glare treatment (Haze 5% ·) TAC (triacetate cellulose) film (made in Japan). Paper product AG-HL), untreated TAC film adhered on the 3rd surface. (10) Adhesive-2 A protective film is adhered to both sides of the above film, and a protective film (Masking Film) which is electrostatically treated is adhered to the side of the TAC film having an anti-glare function. In the present embodiment, a polarizing film having a width of 160 mm was obtained using TFB-4T3-3 6 7AS ' produced by Fujimory Co., Ltd. (11) Edge Slitting and Bias Cutting The polarizing film subjected to the above process (10) is obliquely cut into a width of 16 mm, and is chamfered at 45 degrees with respect to the film length direction, and then cut. The membrane is connected. (12) Adhesive-3 Remove the protective film on the other side of the anti-glare TAC film, apply the acryl-based binder on the surface with a release film (adhesive force of 1 400 g / 25 mm), and then paste the Japanese Teijin The company's product TT-140 1/4 wave plate (phase value is i40nm). (13) Adhesive-4 The protective film of the phase film on the above film was removed, and the DIA FOIL release film was adhered by an acryl-based adhesive (adhesion force of 500 g / 25 mm). 18 1292494 The optical characteristics of the circular polarizer produced through the above process are shown in Table 1. [Table 1] Item existing iodine film Example 1 Main absorption wavelength region (nm) 400 to 700 510 to 590 Monolithic transmittance (%) in the main absorption wavelength region 42 44 Main absorption wavelength region polarization ratio (%) 99 88 ~ 99 380 ~ 780nm single-chip average light transmittance (%) 42.2 56.9 380 ~ 780nm light-viewing polarization (%) 99 85.2

The circular polarizer was fixed to a white color coordinate (0.31, 0.33) and a luminance of 100 nit, and the dot current value on the driver circuit (Driver 1C) was measured. The results are shown in Table 2. The current measuring device used is KEITHLEY Model 2400 Source meter 亮度 Brightness (nit) Current (mA) Brightness ratio at the same current (%) Existing product 100 172 100 Example 1 100 132 130

[Example 2] Using 260 g of the dichroic dye of Chemical Formula 4 of Group B, this single dye was substituted for the dichroic dye in the dyeing step (3) of Example 1, that is, Group 19 of 19 1292494 Chemical Formula 1 A circular polarizer was produced by the same procedure as in Example 1 except that 265 g of the coloring dye and 2 g of the dichroic dye of Chemical Formula 2 were used, and the steps (14) to (14) were carried out. The same method as in Example 1 was used for the produced polarizer, and the light characteristics and power consumption were measured. [Example 3] A mixture of 255 g of the dichroic dye of Chemical Formula 4 of Group B and 4.5 g of the dye of Chemical Formula 6 of Group C was used instead of the dichroic dye in the dyeing step (3) of Example ,, that is, Group A In the same manner as in Example i, the same procedure as in Example i was carried out, except that 265 g of the dichroic dye of the formula i and 2 g of the dichroic dye of the formula 2 were used, and the steps (1) to (14) were carried out to produce a circle. Polarizer. The same characteristics as in Example 丨 were used for the produced polarizer, and the light characteristics and power consumption were measured. [Example 4] A mixture of 245 g of the dichroic dye of Chemical Formula 4 of Group B and 15 g of the chemical formula of Group C was used instead of the color f raw material in the dyeing step (3) of Example 1 The same procedure as in Example 1 was carried out, except that the bischromic dye of Chemical Formula 1 was used and the chemical dichroic dye was 20 g, and the same procedure as in Example 1 was carried out, and the steps (1) to (14) were carried out. Round polarizer. The same method as in Example 1 was used to measure the optical characteristics and power consumption of the polarizer. 20 1292494 [Example 5] A mixture of a mixture of the bischromic dyes of the chemical formula 1-3 of Group B 1-3, which is a mixture of 10 g of a dye of 10 gram*8, was used to construct a mixture of the chemical formula of the brother and the group C instead of the example i. The dyed dichroic dye, that is, the pre-form of the dyeing process in the group A (3), the color dye 265$, and the dichroic dye of the formula 2, 2π A, butyl, and gram, in addition, Beyond 'using the same method as Dou You浐1, create a circular polarized light J with Example 1

[Example 6] The chemical formula s Α α ★ of a ruthenium group is used, and one single dye is used instead of the dichroic dye in the dyeing step (1) of the first embodiment, that is, the chemical formula i of the ruthenium group. 265 g of a color dye and a dichroic dye of Chemical Formula 2 2', except that 'the same method as in Example i was used to produce a circular polarizer 0. The circular polarizer manufactured according to Examples 2 to 6 was used. The light characteristics are shown in Table 3. [Table 3] Item Example 2 Example 3 Example 4 Example 5 Example 6 Main absorption wavelength region (nm) 540~630 530~630 530~640 530~630 520~620 Main wavelength single-chip transmittance ( %) 46 46 44 44 45 Main wavelength region polarizing ratio (%) 88 to 99 88 to 99 88 to 99 88 to 98 88 to 100 Full-wavelength single-chip transmittance (%) 56.2 54.7 53.7 55.8 56.5 Full-wavelength optical polarization Rate (%) 86.4 85.3 87.5 87.4 86.8 21

The chemical formula ("K and Chemical Example 1 1292494" fixed these circular polarizers on a white color coordinate (0.31, 0.33), brightness 100%, and measured the dot current value on the driver circuit (driver 1C). The current measuring device used is KEITHLEY Model 2400 Source meter 〇 [Table 4] Brightness (nit) Current (mA) Brightness ratio at the same current (%) Existing product 100 172 100 Example 2 100 129 133 Example 3 100 133 129 Example 4 100 135 127 Example 5 100 130 132 Example 6 100 128 134 [Example 7] A mixture of 150 g of the dichroic dye of Chemical Formula 5 of Group B and 10 g of the dye of Group C 10 was used. In place of the dyeing process dichroic dye of Example 1, that is, the dichroic dye of Formula A of Group A, 260 of the dichroic dye of Formula 2, except that the same method was used to produce the limit 525. Circular polarizer for ~64Onm. [Example 8] The dyeing process of Example 1 was replaced with a mixture of 50 g of the dichroic dye of Chemical Formula 3 of Group B and 20 g of the dye of Group C. 3) 22 of T

1292494 A dichroic dye, that is, 265 g of the dichroic dye of Chemical Formula 1 of Group A and 20 g of the dichroic dye of Chemical Formula 2, except that the same method as in Example 1 was used to produce a limit of 515~ Circular polarizer for 600 nm. The optical characteristics of the circular polarizer produced in Examples 7 to 8 are as shown in Table 5 [Table 5] Item Conventional iodine film Example 7 Example 8 Main absorption wavelength region (nm) 400 to 700 525 to 640 515~600 main absorption wavelength region monolithic transmittance (%) 42 46 45 main absorption wavelength region polarizing ratio (%) 99 88 to 98 88 to 98 380 to 780 nm monolithic transmittance (%) 42.2 58.5 57.1 380 Light-viewing polarizing ratio (%) of 780 nm 99 85.1 85.5 The circular power polarizers manufactured in Examples 7 to 8 have the effect of reducing the power consumption as shown in Table 6. These circular polarizers were fixed to a white color coordinate (0.31, 0.33) and a luminance of 100 nit, and the dot current value on the driver circuit (Driver 1C) was measured. The current measuring device used was KEITHLEY Model 2400 Source meter 〇 [Table 6] Brightness (nit) Current (mA) Brightness ratio at the same current (%) Existing product 100 172 100 Example 7 100 127 135 Example 8 100 128 134 23 1292494 In summary, the high dichroic dye mixing ratio of the circular polarizer into the (four) section, so that the main absorption wavelength range is 500~ 640nm, the main absorption wavelength bandwidth is 80~12〇nm, the main absorption wavelength region of the single The average light transmittance of the sheet is 5%, the polarizing ratio of the main absorption wavelength region is 88 to 1%, and the average single-chip transmittance in the wavelength range of 380 to 780 nm is "~"%, visible light. The light-refractive index in the full-wavelength region is 胄85% or more. In the case where the light efficiency is low, the light transmittance is increased correspondingly, and the luminous efficiency is relatively low.

: Light transmittance in the red and blue areas, which improves the overall contrast and improves the average brightness. When the average transmittance of the absorption wavelength region lower than 5 〇〇 nm or the full-wavelength of visible light exceeds 59%, the color of the polarizer becomes red (red offset), the contrast is lowered, and the readability (ReadabilitW significant) When the upper limit of the absorption wavelength region exceeds 64 〇 nm or the average transmittance of a single piece in the visible light full-wavelength region is less than 53%, although the contrast is increased, the brightness increase effect is drastically decreased. In addition, the absorption wavelength bandwidth is lower than 8 〇·, , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , ,

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a cross-sectional view showing a circular polarizer of the present invention; and Fig. 2 is a view showing the structure of an organic light emitting diode display in which a circular polarizer of the present invention is mounted. 2A, 2β cellulose triacetate film [Main component symbol description] Polarizing film 24 1292494 3 1/4 wave plate 5 . 100 Metal sheet (cathode) 120 Anode plate 220 Polarized light 4 Polyester substrate protective film 6 Adhesive agent 110 Light-emitting layer 210 Natural light

25

Claims (1)

1292494 X. Patent application scope: 1. A dye-based circular polarizer for an organic light-emitting diode display, comprising a polarizing film and a quarter-wave plate of polyetherol as a basic material, the circular polarizer, The polarizing film is characterized in that the polarizing film is a color polarizing film, and is prepared by mixing a high dichroic dye and performing variegation and stretching, and the main absorption wavelength band in the absorption wavelength range of 5 〇〇 to 640 nm is 80 to 12 〇 nm. The average monolithic transmittance in the visible light wavelength of 380 to 780 nm is 53 to 59%. 2. The dye-based circular polarizer for an organic light-emitting diode display according to claim i, wherein the high dichroic dye is one to three dyes selected from the group consisting of dyes represented by the following chemical workers. And mixed, that is, the group A dye is [Chemical Formula 1] OH [Chemical Formula 2] 26 1292494 Group B dyes [Chemical Formula 3] [Chemical Formula 5] « Group C dyes are [Chemical Formula 6] OH ΗΟ^ί> 27 1292494 [Chemical Formula 7] [Chemical Formula 8] [Chemical Formula 9] 28 1292494 [Chemical Formula 1 ο] 3. The dye-based circular polarizer for an organic light-emitting diode display according to claim 2, wherein: when the high dichroic dye is selected from the group consisting of a dye of the formula 1, the dye of the chemical formula 1 and the dye of the chemical formula 2 are used. Made by mixing. 4. The dye-based circular polarizer for an organic light-emitting diode display according to claim 3, wherein the high dichroic dye further comprises a dye of the chemical formula 7 to the chemical formula 10 of the group C dye. The dye-based circular polarizer for an organic light-emitting diode display according to claim 2, wherein the high dichroic dye is composed of one of the group B dyes. The dye-based circular polarizer for an organic light-emitting diode display according to claim 5, wherein the high dichroic dye further comprises one or two of the group C dyes. The dye-based circular polarizer for an organic light-emitting diode display according to any one of claims 1 to 6, wherein: the external light incident side of the polarizing film is adhered to the anti-reflection A triacetate film that is glare-treated or anti-glare and low-reflective. 30