TWI283940B - Electro-luminescent display panel and electronic device using the same - Google Patents

Abstract

An electro-luminescent display panel includes a first substrate having an array of light emitting elements corresponding to a plurality of pixels thereon and a second substrate having light transmissive regions and a reflective light enhancing pattern layer facing the light emitting elements in the first substrate, wherein the reflective light enhancing pattern layer directs oblique light emitted from the light emitting elements to the light transmissive regions. In another aspect, a reflective light enhancing pattern layer defines a predetermined gap between the first and second substrates.

Description

F.doc/006 IX. Description of the Invention: TECHNICAL FIELD OF THE INVENTION The present invention generally relates to an electroluminescent (EL) display panel and an electronic device using the same. More particularly, the present invention relates to an electroluminescent display panel that emits light upward and an electronic nightmare using such a display panel. [Prior Art] &

An electroluminescent display is a device having a light-emitting element (for example, an organic light emitting diode (OLED) display device, etc.). The characteristics of the electroluminescent display 11 include low driving, high pressure, high efficiency and high contrast. Therefore, the electroluminescence display is very promising as a lower-generation flat panel display H, and it is desired to develop it. The hang-f-turning light ageing device can be divided into an upward illuminating electroluminescent display photoelectroluminescent display. For example, for upward illumination

Polar body or::; color = white light-emitting two co-located by the color light-receiving layer is now full-color display. By locating the light-emitting diodes, a black matrix 1 can be formed and the corresponding color filter layer or color-changing medium or 苏本苏本_4 can be used to display the contrast. However, since the emitted light propagates in all directions from the white light, this invention has luminous efficiency such as π shell size and contrast. The present invention is directed to providing a broad overview of the reflective structure in a desired display panel to enhance luminous efficiency. In one aspect of the invention 1283, a reflected light enhancement pattern layer is provided between a light transmissive region of one substrate of the electroluminescent display device and a light emitting device layer of the other substrate. More specifically, such an EL display panel includes a first substrate including a first light emitting element (eg, OLED) array corresponding to a plurality of pixels on the substrate, and a second substrate including a light transmitting region And a reflected light enhancement pattern layer facing the light emitting element in the first substrate, wherein the reflected light enhancement pattern layer directs the oblique light emitted by the light emitting element to the light transmitting region. In one embodiment, the light enhancement pattern layer includes a reflective surface (eg, a reflective ridge or a reflective block having a facet), and the angle of the reflective surface is set to reflect the oblique light emitted by the illuminating element to the transparent region of the first substrate. . In another aspect, the present invention discloses an electroluminescent display panel comprising a first substrate, a second substrate, and a reflective light enhancement pattern layer between the first substrate and the second substrate. A plurality of light emitting elements (e.g., electroluminescent elements) are included on the first substrate. A black matrix is included on the second substrate. The reflected light enhancement pattern layer is positioned corresponding to this black matrix, and since it may also be composed of an active metal, it can be regarded as a moisture absorbing material. Moreover, in another aspect, the present invention discloses a reflective light enhancement pattern layer of an electroluminescent display panel that acts as a spacer or support to control and maintain a predetermined gap between two substrates of the display panel. The above general description and the following detailed description are intended to be illustrative and not restrictive of the invention. The above and other objects, features, and advantages of the present invention will become more fully understood < 1283娜: wf.doc/006 [Embodiment] As shown in FIGS. 1 and 2, the electroluminescent display panel 12A includes a first substrate 100 and a second substrate 200, and the first substrate 10 includes an array of light emitting elements 102. For example, an organic light emitting diode or an inorganic light emitting diode corresponding to a plurality of pixels 1 on the substrate; the second substrate 2 includes a light transmitting region 204 and a reflected light enhancement pattern layer 208, which is first The array of light-emitting elements 1〇2 on the substrate 100 extends, wherein the reflected light-enhancing pattern layer 208 directs the oblique light emitted by the light-emitting elements 1 to 2 to the light-transmitting region 204. In one embodiment, the reflected light enhancement pattern layer 208 includes a portion having a trapezoidal cross section and a reflective side surface, the angle of the reflective side surface being set to reflect the oblique light emitted by the light emitting element 102 toward the second substrate 200. Light area 204. This reflective surface can have a mirrored surface or a reflective matte that can cause scattering. For example, the reflected light enhancement pattern layer 208 includes reflective turns or reflective blocks having facets. In the schematic representation of Figure 2. The array of light-emitting elements 102 is shown as a continuous layer in Figure 2 for the sake of simplicity. The light enhancement pattern layer 2〇8 may be extended to contact the first substrate 1〇〇, wherein each of the light emitting elements 102 is positioned in the pixel 101 between adjacent turns or reflective blocks of the reflected light enhancement pattern layer 208. In one embodiment, a circuit diagram of an electroluminescent display panel according to an embodiment of the present invention is shown in Fig. 3A, and a circuit diagram of a pixel of the electroluminescent display panel is shown in Fig. 3B. As shown in FIG. 3A and FIG. 3B, the display panel includes a plurality of scan lines such as SL1 to SL4, a plurality of data lines such as DL1 to DL4, and a plurality of images 7 I283mfd, 101 on the substrate, wherein the scan lines SL1 The integrated circuit (1C) 20 is connected to the first driving second driving integrated circuit 30. Silly I lm to DL4 is electrically connected to the display, electrically connected to the scan line, ^\: The circuit diagram is like 101 Φι, 1, and Yinxian line DL1 like Yuki 101 includes switch_transistor T1 , C and LEDs 10 film 屯曰曰 Τ 2, capacitor film transistor Τ 1 (four) pole,: #料 ^ Μ electrically connected to the switch film transistor τι, the original pole. The capacitor is cried to be electrically connected to one end of the switch thin film thunder μ μ to be electrically connected to the drain of the switch thick pancreatic T1 and the driving film transistor, and the other end of the capacitor C is thunder w, gold The source of the # gate. The light-emitting diode 11 is electrically==the drain of the moving film transistor T2. The electric twin is connected to the driving film transistor Τ2. According to an embodiment of the present invention, one step as shown in Fig. 2 and Fig. 2 includes a scooping..., color matrix 202 disposed under the reflected light enhancement pattern layer 208. In addition, the light-transmitting region 2〇4 further includes a color filter layer (CF) or a color-changing layer f (two two

Changingmedium, CCM) (not shown). In one embodiment, the illuminating element 102 is a white light emitting unit and the light transmissive area 〇4 comprises a color filter (CF) layer comprising red, green and blue color filter resins. In another embodiment, the light-sensitive element 1〇2 is a blue organic light-emitting unit, and the light-transmitting region ^2〇4 t includes a color-changing medium (CCM> correspondingly, corresponding to the black matrix plus 2 positioning reflected light enhancement pattern layer 2 It is contemplated that the reflected light enhancement pattern layer 208 and the black matrix 202 can be combined into one unitary structure, which is also within the scope and spirit of the invention. This black matrix can include 8 doc/006 I283gj6g with reflections on the reflective side surface. The structure of the light enhancement pattern. In this embodiment, the reflected light enhancement pattern layer 2〇8 is disposed on the black matrix 2〇2 of the second substrate as shown in Fig. 2. For example, the j light enhancement pattern layer gauge is selected A group consisting of the following materials: metal, active metal, 妓__polymer material, and a combination of the two. For example, the reflected light enhancement pattern layer is reduced (A1), complex ((3) or turned (Mg) 4. When the material selected for the reflected light enhancement pattern layer is composed of an active metal, it can be regarded as a moisture absorbing material. In the embodiment of Fig. 2, the light-emitting element 1 of each pixel 1 〇 1 2 emitted light 130 passes through the light-transmitting area 2〇4' After exiting the display panel 12, in particular, the light (10) emitted by the light-emitting element 1〇2 is reflected by the reflected light enhancement pattern layer 208 and then passes through the light-transmitting region 2〇4. In a conventional electroluminescent display panel If the light incident on the black matrix is absorbed by the black matrix, it cannot be a part of the light that is emitted from the display panel. Therefore, the display panel 12 of the present invention has better brightness and display than the conventional electroluminescent display panel. Further, the 'reflective light enhancement pattern layer 208 can also be used as a spacer or a support in the display panel 120. In detail, the first substrate 100 and the second substrate 200 are sealed with a sealant 21, on both substrates 1 The gap between the crucible 200 and the sealant 210 is filled with an internal gas or liquid. For example, the height of the encapsulant 210 is usually 5 to 5 μm. For example, if the height of the encapsulant 210 is 10 μm, the first The total height of the film on the substrate 1 (for example, the light-emitting element layer 102), the film on the second substrate 200 (for example, the black matrix layer 202), and the reflected light enhancement pattern layer 208

1283 ? _6 is equal to 10 microns. Therefore, the 'reflective light enhancement pattern layer buckle-P is highly ionized or supported to maintain the interlayer between the two substrates to be used to fabricate the pattern layer 208 by the method of Figs. 4A to 4B. As shown in _4A, a substrate on which the first and second enhancements 202 and the light-transmitting region 204 are provided is provided. Next, a reflective material 207 is formed on the matrix 202 and on the light transmissive region 204. 2 = vapor deposition (PVD) (eg, sputtering) to form the reflective material: Thereafter, the reflective material 2G7 is patterned to form reflected light. The enhancement map, the layer 208, is shown in Figure 4B. For example, the reflective material 207 is patterned using lithography and lithography. The reflected light intensity pattern layer 208 can be fabricated by the method of Figs. 5A to 5B. As shown in the ® I 5A, a substrate 200 having a black matrix 2 〇 2 and a light transmissive region 204 is provided. Next, a planarization layer 205 is formed on the black matrix 2〇2 and the light transmissive region 204. For example, the planarization layer 205 is a polymer layer on which the reflective material formed in sequence is well adhered. Next, a reflective material 207 is formed on the planarization layer 205. Then. The reflective material 207 is patterned to form a reflected light enhancement pattern layer 208, as shown in Figure 5B. In the embodiment of Fig. 2, a reflected light enhancement pattern layer 208 is formed on the second substrate 200. However, according to another embodiment of the present invention, the reflected light enhancement pattern layer may also be formed on the first substrate. As shown in FIG. 6 , the electroluminescent display panel 320 includes a first substrate 300 , a second substrate 200 , and a reflected light enhancement pattern layer 308 disposed between the first substrate 300 and the second substrate 2 , the first substrate 300 There is an array of light-emitting elements 3〇2 corresponding to a plurality of pixels 301 on the display 10 1283940 16026twf.doc/006 panel. In one embodiment, the light-emitting element 3〇2 on the first substrate 300 includes an active element 502, an anode layer 508, an organic layer 304, and a cathode layer 3〇6. The active element 502 and the anode layer 5〇8 are separated by an insulating layer 506 which is electrically connected to the anode 5〇8 via a contact 504. The second substrate 200 includes a black matrix 202 thereon, for example, a color filter layer or a color changing medium as described above is formed on the light transmissive region 204 of the second substrate 2 . Specifically, the reflected light enhancement pattern layer 308 is disposed on the first substrate 300 interposed between the pixels 3〇1. In one embodiment, the reflected light enhancement pattern layer 3〇8 is arranged corresponding to the black matrix 202. An enlarged view of the structure of the area 5〇〇 in Fig. 6 is shown in Fig. 7. Referring to FIG. 6 and FIG. 7, the reflected light enhancement pattern layer 308 is placed on the insulating layer 5〇6 and is separated from the organic layer 304 and the anode 5〇8 of two adjacent pixels. The reflected light enhancement pattern layer 308 has a portion having a trapezoidal cross section. In one embodiment, the upper surface 510 of the anode layer 508 and the sidewall 512 of the reflective light enhancement pattern layer 3A must be constructed to have a width of 9 Å. ~150. The flat angle between the faces is θ. In other words, the sidewall is configured to form a reflective surface, so the reflected light enhancement pattern layer 308 has a top width Α, a bottom width β, and a high Η, satisfying the relationship H/2(B_A)=tane', wherein the angle Θ is between 30. ~90. between. For example, the reflected light enhancement pattern layer 308 may be a polymer material having reflective properties. For example, the reflected light enhancement pattern layer 308 may also be composed of an insulating material layer and a reflective material coated on the insulating material layer. Therefore, the reflected light enhancement pattern layer 308 can also be constructed as an integral part of the black matrix such that the black matrix has reflective sidewalls. In another embodiment, the cathode layer forming the passivation layer 310' to cover the light-emitting element 3〇2 is in the embodiment of FIG. 6, by each pixel 3〇1. The light 33G emitted from the light-emitting element 3〇2 passes through the light-transmitting region and then exits the display panel 320. Specifically, the light 34 emitted from the light-emitting element 302 is reflected by the reflected light enhancement pattern layer 308 and then passes through the light-transmitting region 2〇4. Compared with the traditional organic electroluminescent display panel, this is a

There is a better rate of emission in that the reflected light is enhanced to reflect the light emitted to the black matrix to the light-transmitting region 2〇4. In other words, the display panel 320 of the present invention has better brightness and display quality. Similarly, the reflected light enhancement pattern layer 308 can also be used as ' '

A spacer or support in 320. In detail, the sealant '21 is used to seal the substrate 300 and the substrate 200, and the internal gas or liquid is filled in the gap between the two substrates 3, 2 and the sealant 210. For example, the height of the encapsulant 210 is typically 5 to 50 microns. For example, if the height of the encapsulant 210 is 10 micrometers, the thin film on the first substrate 3 (for example, the light-emitting element 3〇2 and the passivation layer 31〇), and the thin film on the second substrate 200 (for example, a black matrix layer) 202) and the total height of the reflected light enhancement pattern layer 308 is equal to 1 〇 micron. Therefore, the reflected light enhancement pattern layer 308 can also function as a spacer or a support to maintain the gap between the two substrates at a predetermined level. According to another embodiment of the invention, another electroluminescent display panel is provided. As shown in FIG. 8, the difference between the display panel 420 in FIG. 8 and the display panel 320 in FIG. 6 is that the substrate 12 (8) further forms 12 12 839 : wf.doc / 006 becomes a double-reflected light enhancement pattern layer. 2〇8. Preferably, the reflected light enhancement pattern layer 2 is positioned corresponding to the reflected light enhancement pattern layer 308. In another embodiment, a passivation layer 31 is further formed to cover the cathode layer 306 of the light-emitting element 3〇2. In the embodiment of Fig. 8, light 430 emitted by the light-emitting element 302 of each pixel 3〇1 passes through the light-transmitting region 2() 4 and then exits the display panel 420. In particular, the light 44 emitted to the black matrix 2〇2 is reflected by the reflected light enhancement pattern layer 308 and/or the reflected light enhancement pattern layer 2〇8, and then directed toward the light-transmitting region 2〇4. Therefore, the display panel of the present invention has better luminous efficiency than the conventional organic electroluminescent display panel because the reflected light enhancement pattern layers 208, 3〇8 can reflect light emitted to the black matrix to the light transmission. Area 2〇4. In other words, the display panel 420 of the present invention has better brightness and display quality. Similarly, the reflected light enhancement pattern layer 308 and the reflected light enhancement pattern layer 208 can also serve as spacers and supports in the display panel 420. In detail, the first substrate 3 and the second substrate 200 are sealed with the sealant 210, and the internal gas or liquid is filled in the gap between the two substrates 300, 200 and the sealant 210. For example, if the height of the encapsulant 21〇 is 10 μm, the thin film on the first substrate 300 (for example, the light-emitting element 302 and the purification layer 310), the thin film on the second substrate 200 (for example, the black matrix layer 202), and The total height of the reflected light enhancement pattern layer 308 and the reflected light enhancement pattern layer 208 is equal to 1 μm. Therefore, the reflected light pattern layer 308 and the reflected light enhancement pattern layer 208 can also be used as a spacer or a support to maintain the inter-team between the two substrates at a predetermined level. 13 Although in the above embodiment, the reflected light enhancement pattern layer is formed on the second substrate, the reflected light enhancement pattern layer may be formed on the first substrate (e.g., on the light-emitting element layer). Further, the reflected light enhancement pattern layer may be a separate structure instead of being previously formed on any of the substrates, but is cooled between the first and second substrates at the time of mounting.

Figure 9 is a diagram showing an electronic device in accordance with another embodiment of the present invention. The electronic device includes an electroluminescent display panel 802 and a driving device 8 electrically connected to the organic electroluminescent display panel 802. The electroluminescent display panel 8〇2 may be the display panel 12A or 420 (shown in Figures 2, 6 or 8). For example, the drive assembly 800 can include a controller (not shown) electrically coupled to the control wheeling device (not shown). A controller is used to control display panel 802' to display an image based on input from an input device that can include a processor or the like to input data to the controller for displaying an image on display garment 802. Examples of electronic devices include, but are not limited to, organic electro-displays and inorganic electro-displays, including electronic devices such as notebook computers, personal digital assistants (PDAs), digital media playback, digital cameras, and playable games. Console and more. Because the electroluminescent display panel of the present invention has a reflected light enhancement and a layer, the electroluminescent display panel has good luminous efficiency. k, this electroluminescent display panel has advantages such as high brightness and good display quality. Further, the reflected light enhancement pattern layer in the electroluminescent display panel can also be used as a spacer or a support. Therefore, the 14 c/006 1283^, 0 gap of the two substrates of the display panel can be maintained at a predetermined level. In other words, in the present invention, the reflection in the electroluminescent display panel is such that the Newton's ring phenomenon does not occur. Further, since the gap between the (4) boards is maintained by the private layer == the wood layer, the display item f of the electroluminescent display panel can be prevented. Tu m I: k± J ^ For a specific display panel design, it may be desirable not to increase the axis of the wire to make it stronger than the reflected light of the substrate. In the above embodiment, the color matrix may not contact the first substrate, the light-emitting element. The layer or black is completely I tw. It is expected that the reflected light enhancement pattern layer may have no gap between the plates and the second and the second base: =========================================================== The material selected is made from the active gold “Cheng Shou”, which can be regarded as hygroscopic material, thus increasing the reliability and life of the dry panel. 乂9 喊 不 隹 ; ; ; The preferred embodiments are disclosed in the above-mentioned H. The invention is not limited to the spirit and scope of the invention, and therefore the protection of the present invention is applicable to the protection of the invention. BRIEF DESCRIPTION OF THE DRAWINGS [Brief Description of the Drawings] Figure 1 is a plan view showing an electroluminescent 12833⁄4 gauge f.doc/006 panel according to an embodiment of the present invention. Figure 3A is a diagram of the -+ panel according to the present invention. Off. (4) (4) Electroluminescence display - a pixel of the electroluminescent display panel. Figs. 4A to 4B are cross-sectional views.

A reflective view is formed on the second substrate of the embodiment, and 〜5B is a cross-sectional view showing another method of forming a reflected light enhancement pattern layer on the second substrate of the embodiment. Figure 6 is a cross-sectional view showing an organic electroluminescence display panel according to another embodiment of the present invention. Figure 7 is a cross-sectional view showing the structure of the area 500 of Figure 6 in accordance with another embodiment of the present invention. Figure 8 is a cross-sectional view showing an organic electroluminescence display panel in accordance with another embodiment of the present invention.

Figure 3B shows a circuit diagram of Figure 3A. Figure 9 is a diagram showing an electronic device in accordance with another embodiment of the present invention. [Explanation of main component symbols] 10: Light-emitting diode 20 • Brother-in-one moving body circuit 3 0 • Younger-drive integrated circuit 100, 300: First substrate 101, 301: Pixel 16 1283· twf.doc/ 006 102, 302: light-emitting elements 120, 320, 802: electroluminescent display panels 130, 140, 340, 330, 430, 440: light 200: second substrate 202: black matrix 204: light-transmitting region 205: planarization layer 207: reflective material • 208, 308 · reflective light enhancement pattern layer 210: encapsulant 304: organic layer 306: cathode layer 310: passivation layer 420: display panel 502: active device 506: insulating layer φ 508: anode layer 510: Upper surface 512: Side wall 800: Driving device θ, θ': Angle A: Top width B: Bottom width Η: Height 17 1283 m f.doc/006 SL, SL1 to SL4: Scanning line DL, DL1 to DL4: Data line T1 : Switching Film Transistor T2: Driving Film Transistor C: Capacitor

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Claims (1)

1283m f.doc/006 X. Patent Application Range: 1 . An electroluminescent display panel comprising: a first substrate, comprising an array of light emitting elements corresponding to a plurality of pixels on the first substrate; W a second The substrate includes a light transmissive region; and a reflected light enhancement pattern layer between the first substrate and the second substrate, wherein the reflected light enhancement pattern layer directs the oblique light emitted by the light emitting element to the light transmitting region. 2. The electroluminescent display panel of claim 2, wherein the reflected light enhancement pattern layer comprises a reflective surface and a set angle 'to reflect oblique light emitted by the light emitting element to the second base region . 3. The electroluminescent display panel of claim 1, wherein the reflected light enhancement pattern layer comprises a reflective prism or a reflective block having facets. In the board, i is at least two of the electroluminescent display surfaces described in the item Hi1. An organic light-emitting diode or an inorganic light-emitting diode 5, such as the electroluminescent dry-surface panel of claim 1, wherein the light-emitting element is a white light, θ color (CF) layer.曰尤毛 is early 70' and the filter plate is included in the light-transmitting area. The electroluminescence of the first item shows the color medium of the silk forest, and the money is included in the change. 19.doc/006 7·If the patent application scope is i The electroluminescent display panel of the invention further includes a black matrix between the second substrate and the reflected light enhancement pattern layer. 8. The electroluminescent display panel of claim 1, wherein the reflected light enhancement pattern layer is supported on at least one of the first and second substrates. 9. The electroluminescent display panel of claim 1, wherein the reflected light enhancement pattern layer is selected from the group consisting of: a metal, an active metal, a polymeric material having reflective properties, and combinations thereof. The electroluminescent display panel of claim 7, wherein the reflected light enhancement pattern layer comprises a first reflected light enhancement pattern layer and a second corresponding to the first reflected light enhancement pattern layer The reflected light enhances the pattern layer. The electroluminescent display panel according to claim 7, wherein the black matrix is a layer separated from the reflected light enhancement pattern layer. 12 Electroluminescence according to claim 1 The display panel, wherein the reflected light enhancement pattern layer extends between the first and second substrates to control a predetermined gap between the first and second substrates. 13. An electroluminescent display panel, comprising: a first substrate comprising an array of light emitting elements corresponding to a plurality of pixels on the first substrate; a second substrate comprising a light transmissive region; and the first substrate A reflective light enhancement pattern 20 I283^iQitwf.doc/006 layer between the second substrate and the second substrate, the reflected light enhancement pattern layer controlling a predetermined gap between the second substrate and the second substrate. 14. The electroluminescent display panel of claim 13, wherein the reflected light enhancement pattern layer comprises/reflects a side surface, and directs the oblique light emitted by the light-emitting element to the light-transmitting region. An electroluminescent display panel comprising a first substrate and a second substrate, the first substrate comprising a plurality of light emitting elements having an anode layer, a cathode layer and a light emitting layer, wherein the second substrate has a The black matrix 'the characteristic of the electroluminescent display panel is: a reflective light enhancement pattern layer between the first and second substrates, wherein the black matrix positions the reflected light enhancement pattern layer. The electroluminescent display panel of claim 15, wherein the reflected light enhancement pattern layer is disposed on the first substrate between the light emitting elements. The electroluminescent display panel of claim 15, wherein the top surface of the anode layer and the side wall φ of the reflected light enhancement pattern layer have a ratio of 90. The angle between the planes of ~15〇〇. The electroluminescent display panel as described in claim 15 wherein the reflected light enhancement pattern layer comprises a polymer material having a reflective property. The electroluminescent display panel of claim 15, wherein the reflected light enhancement pattern layer is composed of a layer of an insulating material and a reflective material coated on the layer of insulating material. 20·-Electronic device, including: 21 1283· 丨 twf.doc/006 1283· 丨 twf.doc/006 An electroluminescent display panel as claimed in claim 1; and a driving device electrically connected to the electroluminescent display panel. twenty two