TW594067B - High transmittance polarization film for improving OLED interfering light - Google Patents

Abstract

The present invention is related to high transmittance polarization film for improving OLED interfering light, in which a phase difference plate of phase conversion is disposed on the color OLED. A polarization film for light absorbing is disposed on the phase difference plate. The polarization degree of the polarization film is from 15% to 93%, and the accompanied transmittance is from 46% to 80%. The color OLED spontaneous light source can reach the desired polarization effect under the high-transmittance polarization film without having the need of increasing electric power so as to maintain the economic lifetime. The incident light from the external interfering light source is partially absorbed by the transmittance polarization film and is transformed through the phase difference plate to change its phase so as to make the polarization film absorb most of the interfering light and obtaining the improvement purpose.

Description

594067 5. Description of the invention (1) [Technical field to which the invention belongs] The present invention relates to a high-transmittance polarizing film that improves the color 0LED interference light source, especially a kind of polarizing effect achieved by absorbing and reflecting the interference light source, without the need to Increase the power and maintain the high transmittance polarizing film with the existing economic life. [Previous technology] From traditional TV image screens using cathode ray tubes to high-density TFT flat-panel displays at this stage, the high-tech industry has not only improved the quality and quantity of displays, but also accelerated the market's expectations and demands for next-generation display components. . Recently, many world-renowned companies have turned their attention to organic small molecules and polymer electro-luminescent diodes (OLED and PLED) as the next generation of high-quality flat-panel displays. The structure and light emitting principle of 0LED is quite similar to that of LED, and 0LED has many advantages, such as self-emitting, thin, simple structure, low driving voltage, wide viewing angle and so on. The advantages of self-illumination enable 0LEDs to emit light without the need for a backlight module; the advantages of lightness and thinness make them not only light in weight, but also generally less than 1.5 mm in thickness; the simple structure has the advantages of low cost and financial efficiency, Improve a lot; low operating voltage less than 10 V, generally less than 5 V can be driven, very power saving; viewing angle, with a wide viewing angle of more than 160 degrees up and down, suitable for viewing; good brightness, high brightness The high contrast makes it excellent in picture quality; the response speed is fast, easy to use under 10 # s or even 1 // s; the use of RGB fluorescent materials or color filters can achieve the goal of full color, making the application surface Extensive; the use of plastic substrates to form the advantages of flexibility, to facilitate the realization of flexible displays; operating temperature widely from Celsius-

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V. Description of the invention (2) Both 40 ° and 60 ° C can be used. Since the color OLED is a self-luminous source, the underlying aluminum plate will be significantly reflected after the source is illuminated on the panel. Therefore, two I polarizing films (plates) ) The incident light source is filtered to separate the light components. A part of it passes through, and the other part is shielded by absorption, reflection, and scattering. However, the traditional polarizing film has a low transmittance, which makes 0LED has a low brightness and high polarization, resulting in poor contrast. For example, in the Republic of China Patent Publication No. 5 0 9 3 1 it is disclosed that the transmittance of the polarizing film is more than 35%, and the polarization is more than 90%. Japanese Patent Publication No. Zhao M-ΐ 59 109 also discloses that the polarizing film has a transmittance of 30%, and a polarizing film with a lower transmittance at this angle will cause insufficient brightness of the OLED. In order to increase its brightness, it is necessary to increase the brightness. 0 LED power can increase the brightness of the light source, but this will shorten the service life. As shown in Figure 9, it is a schematic diagram of the relationship between the brightness and life of the 0 LED. The brightness is controlled at 0.6 (6 0 0 lumens cd / m2). ), Its brightness does not affect Economic life, however, the luminance is increased to 1 (1 square square square lumens c d / m 2) or more, the luminance decay over time, their economic life only up to a maximum of 2500 hours. In addition, U.S. Patent Nos. 6 3 5 6 3 7 6 and 6512624 also disclose that polarizing films used in rearview mirrors can reduce the interference of external light sources. Display polarizing films are widely used in various fields, but for polarizing films Effectively applied to 0LED but no related in-depth discussions, let alone have anti-glare and anti-reflective light functions. Traditional OLEDs need to add goggles if they want to add anti-glare and anti-reflective light functions. [Summary of the Invention] The main purpose of this creation is to solve the above-mentioned shortcomings and avoid them.

Page 6 594067 5. Description of the invention (3) · The existence of the loss, this creation is to provide a polarizing film with high transmittance, and the polarizing film with phase difference plate to make the color 0LED can have higher contrast and brightness. Factory [Implementation] For the detailed description and technical content of this creation, we will now cooperate with the diagram * The description is as follows: Please refer to "Figures 1 and 2", which is a schematic diagram of the creative structure and optical path, as shown in the figure: color An OLED10 is provided with a light source phase shifting phase difference plate 20, and a polarizing film 30 that absorbs the amount of light source projection is arranged on the phase difference plate 20. The OLED10 includes an aluminum cathode layer. The EL light emitting layer 12 And the indium tin oxide layer 13 'The light generated by the OLED10 itself will be displayed by the phase difference plate 20 and the polarizing plate 3 0. However, the external light will first pass through the high-transmittance polarizing film 30, the polarizing film 3 〇 is composed of a polarizing element (PVA) with a single-sided or double-sided bonded protective layer (τ A c). It can also be composed of a laminated phase difference plate with a polarization degree in the range of 5% ~ 93%. The matching transmittance is in the range of 46% to 80%. After being absorbed and refracted by the polarizing film 30, the transmitted light source will be converted to its phase by the phase difference plate 20. The phase difference plate 20 is 1/2 or 1/4 λ plate is made of single layer or multiple layers, the best practice of this creation Examples of the polarizing film 30 of the polarization degree of 70% to 8% billion; optimum transmittance of 50 ~ 5% 5%. This creation is a method to improve the color OLED interference light source, which is provided with a phase shift plate 20 for phase conversion of the light source on the _color OLED10, and a polarizing film 3 that absorbs the amount of light emitted by the light source is arranged on the phase shift plate 20 0, the method for improving the interference of the light source of the color OLED10 is:

Page 7 594067 V. Description of the invention (4) A. The polarized light transmitted through the polarizing film 30 is in the range of 15% ~ 93%, and the transmittance matched is in the range of 46% ~ 80%. When entering the polarizing film 30, the light vector is distributed to absorb part of the light sources, and the remaining external light sources are converted into their incident phases by the polarizing effect;

B. The remaining external light source is then converted by the phase difference plate 20 into the color OLED10 to generate reflection and form an interference light source; C. After the interference light source is reflected, the phase difference plate 20 is used to reverse the phase and then enter the polarizing film 30 ;

D. The polarizing film 30 absorbs the light source by distributing the light vector to the interference light source, and the reflection phase is converted by the polarizing effect, thereby reducing the interference light source actually reflected by the external light source, so that the color OLED10 self-luminous source reduces the light source staggering or overlapping. Disturb the phenomenon and achieve the purpose of improving the image quality. Please refer to "shown in Fig. 3", which is a schematic diagram of another embodiment of this creation, as shown in the figure: this creation can also be provided with an additional functional film 40, the additional functional film 40 is anti-glare, anti-reflection, anti- It is formed by processes such as static electricity. The additional functional film 40 is disposed on the polarizing film 30. The additional functional film 40 LED 100 is configured to significantly reduce reflected light, and thus can achieve anti-glare and anti-reflection purposes. Please refer to "shown in Fig. 4", which is a schematic diagram of another embodiment of this creation. 'As shown in the figure: this creation can be provided with a brightness enhancement film 50, which is attached to the polarizing film 3〇 and Between the phase difference plate 20, the brightness of the OLED10 panel is increased by the brightness enhancement film 50 <, so that the light source efficiency is more effectively used. In order to better understand the differences between this creative and conventional technology, the applicant also provides a comparison of this creative and conventional technology, as shown in Figure 5 ~ 丨 〇, please refer to

Page 594067 5. Description of the invention (5) Please refer to Figure 5 for comparison of transmittance and polarization of different polarizing films. Polarization is defined as the light deflection when natural light enters the polarizing film and passes through the polarizing film. The polarizing film 30 with different transmittances No. 1 to No. 9 is used with OLED10. The relationship between transmittance and polarization is shown in the figure. The polarization will gradually decrease as the transmittance increases. Immunity and contrast must be balanced between polarized light and transmittance. Previous technologies mostly set the transmittance at about 30% and the relative polarized light as high as 90% or more. Although the polarized light is better, the transmittance is too low. However, the brightness of 0LED 10 is insufficient. Therefore, the best embodiment of this creation sets the polarization of the polarizing film 30 to 70% to 80% and the relative transmittance to 50% to 55%. This range is about The polarizing film 30 which falls on the numbers 7 and 8. Please refer to Figure 6 for a schematic diagram of the remaining light source ratio of the LED plus the polarizing film. The four types of light sources are used in combination with the aforementioned nine types of polarizing film 30, and measured with Photo Research-PR-6650. The external light residual rate of LED 'where' number 0 is a simple 0 LED, and numbers 7 and 8 are for this creation. As shown in the figure, the external light residual value of numbers 1 to 6 varies greatly. This ^ polarizing film applied to OLED10 will cause difficulties in practical application, and the polarizing film of No. 9 'is affected by a higher polarization rate, and its external light residual rate has slightly picked up' this creation (No. 7, 8) The external light residual rate is lower than that of pure 0LED or with other polarizing films, especially the red light source is the most obvious' because the red light source has a longer wavelength (about 67〇ηιη), the transmittance is low and the reflectance is high , Its optical analysis spectrum is more obvious, so most of the experimental test data are using the red light source as an indicator, the data shows that most of the interference light sources can be absorbed by the polarizing film 30.

Page 594067 5. Description of the invention (6) Please refer to Figure 7 for a picture of the polarizing film configuration with additional functional film. The figure reads the 50 degree reflectance distribution chart, and the reflectance of the light film 30 can be clearly seen. The southernmost configuration with the additional function of anti-glare can effectively reduce the reflectance. If the additional functional film is 40 ° anti-reverse, it can effectively reduce the reflectance of each wavelength, especially around ~ 600nm, whose reflectance is much lower than Simple polarizing film 30, the segment exactly corresponds to the wavelength of visible light of the human eye (400 ~ 7〇 () nra: It is known that an additional functional film 4 with anti-glare and anti-reflective light is provided. 〇 Used for OLED10 can make a polarizing film The reflectivity of 30 is effectively reduced. Please refer to Figure 8 for a picture of the polarizing film with a brightening film f. This map is also a total reflectance distribution chart. Simple LED10 has the highest emissivity, and the polarizing film 30 can The reflectance can be effectively reduced by combining the light film 30 with the phase difference plate 20 and the brightness enhancement film 50 to further increase the emissivity. The polarized film 30 with the phase difference plate 20 or the brightness enhancement film 50 has a significantly lower emissivity than the simple OLED10. , Plus this wavelength at the wavelength of visible light, therefore, The film 50 board 20 can improve the more effective use of the light source. In summary, this creation uses the high transmittance polarizing film 300 LED 10 to achieve the desired polarizing effect without the need to increase the existing economic life. In addition, the external interference light source is partially absorbed and converted by the phase difference plate 20, so that the reflection of the external color 0 LED 1 0 interferes with the secondary phase conversion of the light source, and 30 absorbs most of the interference light source and is improved. The target person, 'and can integrate anti-glare and anti-reflective light functions on the polarizing film. According to the 3 map, the simple polarizing film 40 is shown, and the light can be emitted at a wavelength I of the wavelength 5 50, so it can be' actually faint ' Schematic diagram, the wavelength is reversed, but its anti-external light reflection segment correspondence or phase difference is reduced to make the color power and the dimension of the polarizing film 3 0 to the light source passing through the polarizing film and this creation according to the examination base 594067 V. Description of the invention ( 7) Quasi pages 1-2-21, in the technical field to which the invention belongs, when the invention can break through the technology and knowledge that has long been entrenched in the technology, it can be regarded as having obvious progress. The selected transmittance is 46% ~ 80%, which is obviously different from the conventional technology of more than 30%. The transmittance is in line with the patent requirements specified in the Patent Law. However, the above are only the best implementation of this creation. For example, when it is not possible to limit the scope of the implementation of this creation, that is, all equal changes and modifications made in accordance with the scope of the patent application for this creation shall still fall within the scope of this creation patent. 594067 Schematic description [Schematic Brief description] Figure 1 is a schematic diagram of the structure of this creation. Figure 2 is a schematic diagram of the optical path of an OLED plus a polarizing film. Figure 3 is a schematic diagram of another embodiment of this creation. A schematic diagram of an embodiment. The fifth graph is a comparison chart of transmittance and polarization of different polarizing films. Figure 6 is a schematic diagram of the residual ratio of the external light source of an OLED plus a polarizing film. Figure 7 is a schematic diagram of a polarizing film with an additional functional film. Figure 8 is a schematic diagram of a polarizing film with a brightness enhancement film. Figure 9 is a schematic diagram of the relationship between brightness and life of an OLED. [Description of the symbols in the diagram] 0LED ....... ... 10 Aluminum cathode layer ... 11 EL light emitting layer ... 12 Indium oxide Tin layer ... 13 phase difference plate ... 20 polarizing film ... ........ 30 Additional function film ........ 40 Brightening film ......... 50

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Claims (1)

594067 6. Scope of patent application 1. An improvement on the color phase difference LED on the above-mentioned phase difference plate is characterized by: The boundary of the polarizing film reaches the expected polarization life at 46% ~ 80 ° / 〇, and the external interference phase difference The panel converts the secondary phase of the interference light source to improve it. 2. If the patent application source has a high transmittance deviation of 70% ~ 80%. 3. If the patent application source has a high transmission rate of 50% ~ 55%. 4. As constituted by the high transmittance deviation plate of the patent application source. 5. One side of the high transmittance bias (PVA) of the patent application source 6 6) For the high transmittance polarizing film of the patent application color 0LED interference light source, a phase difference plate with a light source phase conversion is installed, and an absorption is arranged in the configuration The polarizing film of the light source's projection amount, its ^ a few factories / | 00G I to pass the flat 4 order to be colorful: t self-luminous source in the high transmittance polarizing film to increase the power while maintaining the existing economic life of light source light is transmitted through a low I Phase, so that the foreign # A / knife absorbs and is converted by the bit to reach the color 0led reflector. In order to first absorb most of the interference light source range of the first item, +,>, ^ light film, * = = 0. LED interference light 4 best implementation of polarizing film polarized =: brother 1: improved color as described 0LED interference light, the best implementation of the polarizing film through the $: improved color OLED interference light described in the above item I, '^, Medium, the polarizing film can also be laminated phase, surrounding the one described in item 1 Improving the color OLED interference light film OLED The polarizing film is composed of a polarizing element t double-sided bonding protective layer (TAC). The improved color 0LED interference light described in item 1 594067 6. Scope of patent application High-transmittance polarizing film of source, in which the polarizing film can be formed into additional functional films through anti-glare, anti-reflection, and anti-static processes. 7 · The high transmittance polarizing film for improving the color 0LED interference light source as described in the first item of the scope of the patent application, wherein the polarizing film is bonded to the brightness enhancement film process to achieve a more effective use of the light source. 8 · The high transmittance polarizing film for improving the color 0LED interference light source as described in item 1 of the scope of the patent application, wherein the phase difference plate is 1/2 or 1/4 and any one of the plates is a single layer or multiple layers. form. 9 · A method for improving the color 0LED interference light source is provided on the color OLED with a phase shift plate for light source phase conversion, and a polarizing film that absorbs the projection amount of the light source is arranged on the phase shift plate, which improves the color OLED interference light source. The method is as follows: A. The degree of polarization through the polarizing film is in the range of 15% to 93%, and the matching transmittance is in the range of 46% to 80%. When an external light source enters the polarizing film, the light vector is measured. Partially absorb and absorb part of the light source, and the remaining external light source will change its incident phase by the polarizing effect; B. The remaining external light source will change its phase by the phase difference plate and enter the color 0LED to generate reflection to form the interference light source; C. The interference light source will be reflected by the bit first. The phase difference plate changes its phase again and then enters the polarizing film; D. The polarizing film absorbs the light source by allocating light vectors to the interference light source, and the reflection phase is converted by the polarizing effect to reduce the interference light source that is actually reflected by the external light source. The color 0LED self-luminous source can reduce the interference phenomenon of light source staggering or overlapping, and achieve the purpose of improving the image quality. Page 14