TWI221209B - Surface light source device and display device - Google Patents

Abstract

The present invention provides a surface light source device. A plurality of LED 18A and LED 18B are arranged in each light input part. LED 18A and LED 18B are dot light sources of different device types and different kinds. In each light input part, LED 18A and 18B are closely disposed, and light is supplied to the light transmission plate 16 by an optical path that is substantially uniform when viewing from an emitting surface. When one or two of the LED 18A and LED 18B is lighted, light passes through an injecting surface 16D arranged at a light source input angle part for being guided to the light transmission plate 16. The guided light source is internally reflected by an optical path curved face 16C and sent back to the light transmission plate 16. The light input part can also be arranged at a location beyond the angle part. In addition to the back-end illumination, the present invention is also suitable for using a front-end illumination to illuminate on a liquid crystal display panel 2. It is also possible to form optically scattered pattern on the emitting surface 16B. Even when switching to light between different kinds of LED 18A and 18B, it will not cause dramatic change of optical path that may generate fluctuation in illumination quality and display quality.

Description

1221209 印 A7 printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs 5. Description of the Invention (1) [Background of the Invention] [Technical Field of the Invention] The present invention relates to a surface light source device and a display device. In particular, the present invention is A surface light source device using a plurality of types of point light emitters as a primary light source and a display device using the surface light source device as an illumination means. The invention is applicable to, for example, a liquid crystal display device mounted on a mobile phone, or a surface light source device that provides lighting means for the display device. [Related technology] It is generally known that a liquid crystal display panel of a liquid crystal display device is illuminated using a surface light source device. Basically, a surface light source device includes a light guide plate and a primary light source for providing a light source to the light guide plate. In recent years, primary light sources tend to be used in dot-shaped light-emitting bodies similar to LEDs (light-emitting diodes). In particular, the tendency to be used in a small display liquid crystal display device mounted on a small device such as a mobile phone is remarkable. Fig. 5 is an exploded side view illustrating a liquid crystal display device using a conventional surface light source device using LEDs to illuminate a liquid crystal display panel. In addition, Fig. 6 shows a sectional structure of the surface light source device. With reference to the two figures, it can be seen that the liquid crystal display device! It has a liquid crystal display panel 2 illuminated by a surface light source device 3. The surface light source device 3 includes a light guide plate 6, an LED (point-shaped light emitter) 8, and a reflection plate 5. The light guide plate 6 is substantially rectangular, and the stab-measuring surface on one side provides an exit surface 6B 'and the measurement surface on the other side provides a back surface 6A. The light guide plate 6 is made of a transparent body like acrylic resin, and is manufactured by injection molding. The reflection panel 5 is made of white-like sound μ

颊 W cheek 1 is composed of a diaphragm 1 and a back 6 A ^ paper size applies Chinese National Standard (CNS) A4 specification (2) 0 X 297 mm) 312253 ---------- --- Installation ------- Order --------- line (please read the notes on the back before filling this page) Λ7 Yinfeng, Consumer Cooperative of Employees, Intellectual Property Bureau, Ministry of Economic Affairs Explanation (2 The leaked light is reflected into the light guide pole 6 to prevent chaotic reflection, which results in a variety of conduction losses. In addition, it is emitted. The incoming and outgoing light from the emitting surface 6B is configured to achieve a predetermined brightness. This overall structure is formed once Light source. In this example, one unit = coffee 8 and one opposite end surface (incident surface) 60 relative position. I have placed it on the light guide plate 6 LED8-after lighting, the light passes into one 6. The introduced light gradually emerges when the guide D sheet captures the light guide plate surface 6B. From M to reflect from the exit to the exit, the reflection plate 5 is used to guide the inside of the guide plate 6. This prevents the loss of light. To promote the emission, Some processing is usually applied to the exit surface 6B. For example, by de-matting, or applying a treatment to the inside of the mold for injection molding, the exit surface is stained. The majority of the small light scattering is difficult (that is, the light scattering form). In addition, by adjusting the dense and dense distribution of the small light scattering elements, the brightness of the entire emission surface 6B can be uniformized. In addition, it is an alternative In this scattered light form, the entire exit surface 6B or the back surface 6A may be roughened in some cases. In this case, the brightness of the entire exit surface 6B may be uniformized by adjusting the distribution of the density of printing. Effect. Recently, a new tendency is to use a plurality of types of led point light emitters with different light emission colors as the primary light source. For example, by selecting two kinds of light emitting LED point light emitters for lighting, it can be used in display devices. Achieve at least three color displays (two separate colors + mixed colors). However, when using a plurality of dot-shaped illuminants, the pages are often aligned with the lighting of different pages. The paper dimensions apply the Chinese National Standard (cns) A4 specifications (2丨 〇X 297mm) 2 312253 1221209 A7 printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs 5. A description of the invention (3 dot-shaped luminous body, which results in a change in the brightness distribution of the outgoing surface, or the color is not changed. In this case, the display brightness distribution or color of the display device may be unnatural (uncoordinated). The cause of this problem is generally considered to be due to the point shape of the light. As a result, the propagation path in the light guide plate also changes overall, which affects the brightness distribution of the exit surface. As shown in Figure 7, two types of LED8A, 8B are configured in the traditional way in the past, and "LED8A is individually lit. "," LED8B lighting alone "," LED8A, LED8B lighting at the same time "three lighting methods, as shown by the arrow, the light propagation path will vary greatly with different lighting methods. As mentioned above, even if the output surface is uniformly processed with uniform brightness (for example, scattered light), this problem cannot be solved. The reason is that even if the processing is performed by setting a lighting method (such as 1 ^] 〇 八八 Individual lighting) to achieve the desired average brightness of g, it is set by other lighting methods (such as LED8y $ single lighting). The light propagation path is completely changed, so that the desired bright distribution cannot be maintained. In view of the above considerations, the problem can be solved by using a two-color light emitting type LED device. Two-color light-emitting type LED devices are packaged with red light-emitting LEDs and green light-emitting LEDs in the same package and sold as a unit or combination. With such a two-color light-emitting type LED vibration setting, a light-emitting circuit can be selected according to the light-emitting color design of each coffee ', so as to solve the above problems. However, due to the following factors, the full sound cannot be obtained due to the following factors: The paper size applies the Chinese National Standard (CNS) A4 specification (210 X 297 mm) 312253 n I i HI nn I mmni ί II n Hi i--ii ϋ nt i aοτ III nmnnm I (Please read the precautions on the back before filling this page) 1221209 A7 B7 V. Description of the invention (4) That is, a plurality of types of LEDs that will be enclosed in the same package When using a primary light source in a surface light source device, problems such as failure of the brightness due to switching of the luminous color, or the fact that one luminous color is clearly visible and the other luminous colors are dim and difficult to see often occur. The reason is that the luminous characteristics (especially luminous brightness) of each LED enclosed in the same package are different, and an LED combination with an appropriate combination of properties (especially, uniform luminous brightness) may not be able to be realized. Therefore, only a combination device with good light emitting characteristics can be practically used, which is very inefficient. In addition, if the appropriate combination of characteristics is to be achieved, it is necessary to make great changes in the manufacturing process of the device, so it is not practical. [Objective and Summary of the Invention] It is therefore an object of the present invention to provide a surface light source device and a display device capable of solving the above-mentioned problems. Specifically, the present invention relates to an improvement of a surface light source device having a plurality of types of point light sources as a primary light source. The purpose of the present invention is to improve the surface light source device so as not to be affected by the type of point light sources that are turned on to obtain stability. Lighting quality. / / Therefore, another object of the present invention is to improve the display device by using the improved surface light source device, so that it is not affected by the type of the point-like light-emitting body that is turned on to obtain stable display quality. In addition, from another point of view, that is, without using a device that encapsulates multiple types of dot-shaped light emitters in the same package form, it is possible to avoid the occurrence of lighting or poor display quality due to changes in the type of dot-shaped light emitters that are lit. Surface light source device and display device. • First of all, the present invention is suitable for introducing a primary light source with a plurality of types of point light emitters and the light provided by the aforementioned primary light source into the light guide plate, so please read the precautions on the back first and then page the employee ’s intellectual property bureau for consumption Copies printed by the cooperative are in accordance with China National Standard (CNS) A4 (210 x 297 public love) 4 312253 1221209 A7 Printed by the Consumer Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs 5. Description of the invention (5) Area light source device. According to the present invention, the light guide plate includes a surface opposite to the exit surface; a light input portion that receives light from the primary light source, and the light input portion includes a surface opposite to the exit surface and a back surface; The light path zigzag portion of the inclined surface and a light-emitting surface that allows light from the aforementioned primary light source to enter. The light introduced into the light guide plate through the incident surface can enter the light guide through the internally reflected light of the inclined surface. In addition, the most important feature of the present invention is that the aforementioned plurality of point-shaped light emitters are configured such that at least two types of point-shaped light emitters of individual device types can correspond to one light input section, and at least, at least The two types of dot-shaped light emitters can each supply light to the aforementioned incident surface from positions close to each other. • As a result, even if the type of the point-like light-emitting body that is turned on is changed in actual use, the light supply position of the light guide plate is generally not changed = the change in the light propagation path after the introduction of the light guide plate is reduced and maintained The stable lighting quality does not cause the viewer to feel uncoordinated. Not only 'the aforementioned projection surface is formed along the edge of the aforementioned light guide plate. At the same time, the at least one light source input portion may be assembled at at least one outer corner of the light guide plate. In this case, as a matter of course, the incident surfaces constituting a part of the light input section are also arranged at the same outer corner. Body # 二 1 In terms of the entrance part of each light wheel, the projections of the at least two types of point-shaped light emitting surfaces mentioned above are expected to be consistent with each other in principle. In the conventional embodiment, for each of the light input parts, the foregoing to ㈣: point-shaped illuminants are basically arranged along the direction opposite to the projection of the incident surface before the normal line standing on the inclined surface. -------------- I ---- (Please read the notes on the back before filling in this page) Order and line. This paper is in Chinese Standard (CNS) A4 size⑵Gx 297 y 312253 A7 V. Description of the invention (6) In this way, the light supply path from the point light emitter (light emitting point) of each light source input section to the incident surface is' if the degree of consistency when viewed from the emitting surface is south, then There are different types of point-shaped illuminants that are turned on, and the light source propagation path after changing the cutting surface is roughly the same, so the effect on the lighting quality will be smaller. In other words, the gap between the light source supply paths (two or more) 1 in each light source input section is advantageous for those that are within the thickness direction of the light guide plate and the vertical plane (incident surface and plane). If the surface light source device constituted as described above is used to illuminate the liquid crystal display panel, a display device improved according to the present invention can be provided. In addition, in this booklet, the so-called "point-shaped light emitters of at least two types of individual device forms" are in contrast to the aforementioned "device form of at least two types of point-shaped light emitters enclosed in the same package" Of it. In other words, each "at least two types of dot-shaped light emitters in individual device forms" (that is, each dot-shaped light emitter in individual device forms) can be freely selected and combined in most devices of various types, so it can have a high degree of freedom Select a dot-shaped emitter with a good balance of luminous characteristics. Therefore, unlike the "two-color light-emitting type or even multi-color light-emitting type device," which is fixed from the beginning, the present invention makes it extremely difficult to use difficult parts (devices) in surface light source devices in the manufacturing process. low. In addition, according to the present invention, a plurality of types of dot-shaped light emitters are arranged corresponding to each light input unit and arranged at positions close to each other by a desired appropriate combination. Since the light source is supplied to the incident surface from this, regardless of the point of any kind The light-emitting body is turned on, and the light transmission in the light guide plate will not produce too much (please read the precautions on the back before filling in this page) --ί-Γο * " The paper size printed by the cooperative is applicable to the Chinese National Standard (CNS) A4 (210 x 297 mm) 6 312253 1221209 Λ7 Printed by the Consumer Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs 5. Changes to the invention description (7). In this way, you can avoid the aforementioned problems of high quality of light emission or display quality. At the same time, it is also possible to avoid the occurrence of inefficiencies due to the large number of "two-color light-emitting types and even multi-color light-emitting devices", which can only use a few of them. [Brief description of the drawings] Fig. 1 is an exploded perspective view showing the outline of the overall configuration of a liquid crystal display device using the first embodiment of the present invention. Fig. 2 is a plan view (A) of the light guide plate in the embodiment as viewed from the direction of the exit surface, and a cross-sectional view (B) showing the edge section of UNE A_A. Office Figure 3 shows the enlarged plan and area (B) of the vicinity of the source output section. > Figure 4 is a plan view of the light plate of another embodiment as viewed from the direction of the exit surface. Figure 5 is a perspective view of the surface light source device in the previous embodiment.罝 Outline Figure 6 is a sectional view of the surface light source device shown in Figure 5. Figure 7 illustrates the use of multiple types of dot-shaped light emitters. Just talk

Bright drawing [Simplified explanation of symbols] 11 1 Liquid crystal display device 3, 13 Surface light source device 6A, 16A Back face of light guide plate 16C 1 Liquid crystal display panel 6, 16 Light guide plate 6B, 16B Light guide plate light path zigzag surface (inclined surface) 6D For the incident surface of the 16D light guide plate, the ^ 's scale is applicable to the Chinese National Standard (CNS) / YI specifications (2! 〇χ 297mm 31 ^ 253 ------------------ ---- Order ---------- (Please read the notes on the back before filling this page) 1221209 A7 B7 V. Description of the invention (8) 8 '8A, 8B, 18A, 18B LED (point Example (please read the precautions on the back before filling out this page) The following describes the embodiments of the present invention with reference to Figures 1 to 4. In addition, for the sake of understanding, the requirements of each element will be described in each figure. The size and shape are appropriately enlarged and displayed. In addition, the same elements in FIGS. 5 to 7 are given the same symbols, and repeated explanations are appropriately omitted. [Embodiment] Fig. 1 shows a display device of this embodiment. (Liquid crystal display device) The general structure. The liquid crystal display device Π is suitable for a display device such as a mobile phone. Surface light source device 1 for display panel illumination 13. The surface light source device 13 includes a light guide plate 16, LEDs (point-shaped light emitters) ISA, 18B, and a reflection plate 5. The light guide plate 6 uses a similar acrylic resin (PMMA resin) The light-transmissive material composed of a cycloolefin resin or a cycloolefin resin removes the zigzag surface of the optical path described later, so as to have a thickness of about the same. The light guide plate 6, and the measuring surface on the side provides the exit surface 6B, and the other —The measuring surface on the side provides the back 6A. Figure 2 is a thousand-plane view (A) showing the light guide plate used in the embodiment shown in Figure 1 viewed from the exit surface side, and, Along the line A_A, mi .: These figures show that the light guide plate 16 is generally rectangular. The outer corners of Γ are provided with a connecting exit surface 6B, and the corners are each equipped with: a folded surface. This embodiment provides a kind of At both ends, a light source input portion of the optical path zigzag portion is provided. The optical path zigzag surface 16C is 颏 夂 & ____ See that each corner is cut into a bevel-shaped bevel. The paper rule is fresh (cNSw ^ ~ Ί225225 Printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs 1221209 V. Description of Invention (9) In the figure (A) and (B), the angle formed by the edge of the optical path zigzag plane we corresponding to one of the aforementioned sides (short side) is represented by θ1, and the angle of inclination corresponding to the exit surface 16B and the back surface 16A is < 9 2 The angle 0 i is usually around 45 degrees, and the angle 0 2 is in the range of 45 degrees to 20 degrees. In the example, the size of the back 16A is slightly larger than that of the 16B due to the inclined shape.—General In other words, the measurement surface with primary light sources 18A, 18B is slightly larger than the measurement surface of the other side. Thinking of this situation from the function of the optical path zigzag surface 16C (using the internally reflected optical path zigzag), we know its inevitability. The rectangular dotted line shown in Fig. 2 (A) represents the effective light emitting area of this embodiment. The display screen size of the liquid crystal display panel 2 is the same as or slightly smaller than the effective light emitting area. In order to correspond to each optical path zigzag surface 16C, a part of the back surface 16A is provided with an incident surface 16D. As shown in Fig. 2 (B), the LEDs 18A '18B are arranged close to each other at positions facing the incident surface 1 oD so as to emit a light source toward each incident surface 16D. In addition, it is preferable to set the positions from the supply path to the LEDs 18A and 18B to the positions slightly overlapping when viewed from the side of the exit surface. In addition, as explained in the conventional technology, a light scattering pattern that promotes light emission is formed on the exit surface 16B as required. In addition, the entire light exit surface 16B may be roughened to replace the light scattering pattern in order to achieve ^ The purpose of promotion. The light guide plate 16 and the reflection plate 5 are both housed in a frame (schematic drawing), and are placed in a predetermined position on the wiring substrate (schematic drawing). The wiring board has this paper standard CNS A4 specification ⑵Q χ 297 公 爱 Ι1ΙΙΙΙΙΙΙΙ — — — — I 1 IIIII «— — — — — III (Please read the precautions on the back before filling this page ) 1221209 A7 V. Description of the invention (10

There are: integrated circuits for driving the liquid crystal display panel 2 of the liquid crystal display device u on the mobile phone, and for driving ledi8a, 18B

The circuit. This drive circuit is designed to be able to switch between "Only LED18A" and "Only LED18B" in accordance with user operation. In addition, it can also be turned into LED1 8 A, 1 8B at the same time. For example, using LED8A as the green light-emitting diode and LED18B as the red light-emitting diode, you can switch between “green lighting”, “red lighting”, and “red, green mixed lighting”. As for the "red and green mixed lighting", the supply ratio of the driving current of the LEDs 18A and 18B is a variable ratio, and the freedom of color can be increased. Each use. The LED 1 8 A and LED 1 8B of P (each light source input section) have different color emission devices incorporated in them. That is, "two-color light-emitting diodes" manufactured by encapsulating LED18A and LED18B in the same package form are not used. In this way, a device with a separate design form for LED18A and LED18B is used to arrange a device with good combination (balance of characteristics, especially the amount of light emission or directivity of light emission) at each light source input section. In a general embodiment, the "light-emission amount" and "directivity of emitted light" of LED18A and LED18B are combined into each surface light source device 13 or even the day-to-day display device 11 with substantially the same device. Therefore, when the LED 18B is turned on, the distribution of the illuminating light transmitted inside the light guide plate 10 will be approximately the same as that when the LED i 8 A is turned on. In contrast, when two-color light-emitting diodes are used, their combination is already fixed during the manufacturing process. Therefore, it is not possible to select individual devices with a good balance of characteristics to combine them as described above. 々The paper size is applicable to Chinese national standard specifications. Gx 297 Public Love ----- I 丨 i 丨 I-- 丨. 丨 I (Please read the precautions on the back before filling this page): Order: Bureau of Intellectual Property, Ministry of Economic Affairs Printed by the Consumer Cooperative Cooperative A7 ----- ~ _______ _ V. Description of the Invention („) In addition: About the LED18A and LEm8B

It is better to consider the direction of the arrangement. That is, each of the light emitting points of LEE > 18a and LED18B is arranged in a centered manner corresponding to the incident surface of the incident surface 16 D which is normal to the normal path of the optical path zigzag plane (slope) 1 π, ..., t, and. good. As a result, the Zhao Ming 夕 八……, Yue You's knife spreading inside the light guide plate 16 are less susceptible to the switching of LED18A and LED18B lighting.

W > In addition, as for the postures of the respective LEDs 18A and 18B, as shown in Fig. 1, it is preferable to adopt a posture capable of turning and tilting in accordance with the formation direction (angle H) of the optical path meandering 16c. The operation state of the light source in the liquid crystal display device constructed as described above is roughly as follows. Regardless of which of the LEDs 18A and 18B is turned on, each of the light input portions (the two corner portions in this embodiment) transmits light to the light guide plate 16 through the projection surface i 6D. I Most of the introduced light will be incident on the tortuous surface 16C and printed inside the Consumer Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs (please read the precautions on the back before filling this page). When the internal angle of incidence exceeds the critical angle, the component will be totally reflected. The higher the total reflection component, the less light leaks from the zigzag surface of the optical path. Here, the angle 0 2 (refer to FIG. 2 (B)) and the erection posture of the LED 18 (light emitting direction) should be determined in consideration of this point. Here, the main point is the proximity configuration of LED18A and LED18B, and the formation of the proximity light source supply path. That is, in the case of LED8A and LED18B, the light introduction path from the light emitting point to the tortuous surface of the optical path via 16D will not be too different.

In particular, when each of the LED18A and LED18B reaches the incident surface 16D, the paper size is applicable to the Chinese National Standard (CNS) A4 specifications (2) 0 X 297 meals 11 312253 1221209 A7

In the supply path, the positions and postures of the LEDs 18A and 18B are set such that when '' is almost overlapped with-when viewed from the exit surface side, the equivalent light supply can be observed from the exit surface side. & Compared with the embodiment of Fig. 7 described above, the advantage of applying such a method can be understood. In the embodiment shown in FIG. 7, compared with this embodiment, since the positions of the light emitting points (the positions of the two LEDs 8A and 8B) are isolated, the propagation path after the light source is introduced into the light guide plate will be greatly different. The light source that performs the direction conversion on the optical path zigzag surface 16C expands in accordance with the directional characteristics of L_ED18A (or 18B), and gradually disengages from the optical path zigzag surface 16C to propagate inside the light guide plate 16. The internal propagation direction is the back surface 16A and the exit surface 16B. Most of the non-parallel components repeatedly internally enter the back surface 16A and the exit surface 16B. It is assumed that when the exit surface 16B is a mirror surface, the part with an incident angle lower than the critical angle at the time of internal incidence will be emitted from the exit surface 16B. Since the exit surface 16B in this embodiment has been precisely processed by the description of the scattered light pattern or the overall roughening of the exit, the exit can be promoted. The light emitted from the emission surface 16B is supplied to the liquid crystal display panel 2. The liquid crystal display panel 2 displays an image on a display screen according to a generally known operation principle. In addition, most of the light source leaked from the back surface 16A is reflected by the reflection plate 5 and returned to the light guide plate 16 to give another opportunity to emit light from the exit surface 16B. Here, although the LEDs 18A and 18B are arranged close to each other, it should be noted that the light emitting points of the two are not completely the same. That is, the luminous point is slightly different. However, this difference will become smaller in the light source propagation process. This point refers to Section 3 (A), (please read the precautions on the back, and then this page).-Printed by the Consumers' Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs This paper is printed in accordance with China National Standard (CNS) A4 (210 X 297) (Gongchu) 12 312253 1221209 A7 _____________B7____ printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs 5. Explanation of the invention (13) (B) The figure is simply explained. As shown in this embodiment, when the light emitting points of the LEDs 18A 'and 18B are arranged in a projective phase corresponding to the incident path 16d normal to the tortuous surface (slope) 16C of the optical path, as shown in FIG. When the exit surface 16b is a vertical in-plane illumination light, the parallel optical path of the back surface 16A and the exit surface 16B will reflect the above-mentioned difference. As for the light path that greatly aids the emission from the exit surface 丨 6 (the light path that will cause repeated reflection of the cook surface 16A or 16B); because there are various things, if you consider it as a whole In addition, as shown in Fig. 3, when the illumination light propagating parallel to the exit surface 16] B and located on the inner surface is observed, the diffused light LA from the LED 18A and the diffused light LB from the LED 18B can be found. The difference between them is very small at the beginning, but after the internal reflection through the light path zigzag surface 16C provided at the corner, it will shrink even smaller. Therefore, the light spreading LA and LB that are parallel to the exit surface 16B and located on the inner surface overlap almost without any difference. The brightness distribution or color distribution on the exit surface 16B will not be caused by the LED 18A, 18B. The effect of switching lighting or mixing lighting at the same time without unnatural changes in the seat is more than ten advantages. This point can be confirmed by comparison with the embodiment of Fig. 7 described above. [Other Embodiments and Modifications] The above embodiments are not intended to limit the display of the present invention, and for example, the following modifications are also allowed. -------------- Installation -------- Order --------- Line (Please read the precautions on the back before filling this page) Applicable to China National Standard (CNS) A4 (210 X 297 mm) 13 312253 1221209 A7 B7 Printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs 5. Description of the invention (14 (a) In the above embodiment, the light source is turned into the It is provided on the corners of the two ends of one side, which is only an example and is not intended to limit the present invention. As shown in FIG. 4, it is also possible to form an inclined surface (optical path zigzag surface) along one side, and Light input sections are formed at a plurality of fixed points. At this time, various point light emitters (LEDs) can be arranged close to each other according to each light source input section. In addition, at this time, it should also be as shown in Figure 4, The luminous point of most types of LEDs can also be juxtaposed at a position approximately along the projection of the incident surface of the normal line on the zigzag surface of the optical path, so that it can be obtained as illustrated in Figure 3 (A) '(B). It has the same effect (reduction of optical path difference). (B) The inclined surface of the optical path zigzag part of the light input part is also flat. For example, the inclined surface may be formed in a curved manner. (The light input (supplied to the light source of the light guide plate) is performed by the back portion of the light guide plate in the above embodiment. However, this does not limit the present invention. That is, as shown in FIG. 1, the light guide plate 16 may be arranged in a reversed manner, and the incident surface may be set on the exit surface 16B. In this case, a variety of dot-shaped light emitters are also provided on the exit surface 16B. The light source supply from the exit surface position is more suitable for a reflective liquid crystal display panel which is illuminated from the front position, which is a so-called front-illuminated display device. In addition, when the front-end lighting configuration is adopted, especially when the size of the reflective liquid crystal display panel is about ㈣ or larger than the light guide plate, the cutout corresponding to the corner of the light guide plate can also be used at the corner of the reflective liquid crystal display panel. Setting the cut-out portion and arranging LEDs on the cut-out portion This structure is helpful for the display device f paper size ii ^ _s) A4 size ⑽ x 297 meals) {Please read the precautions on the back before this page) Order - Line · Shu · a ^ 12〇9

Fifth, the thinning of the invention description (μ). Printed by the Consumer Affairs Bureau of the Ministry of Economic Affairs and Intellectual Property Bureau. ⑷In the above embodiment, the incident surface in the input section of each light source is provided by the-part of the back of the guide plate. However, this point does not limit the present invention. For example, an incident light guide portion protruding from the rear surface toward the LED is also provided, and an incident surface is provided from the front end surface. Deformations such as these are also suitable for configurations with front-illuminated shapes. In addition, a cut-out portion is provided on the corner of the above-mentioned reflective liquid crystal display panel, and the protruding incident light guide portion and the cut-out portion can be designed to cooperate with each other in an appropriate positional relationship, or this reflective liquid crystal display panel can be applied to Light guide plate position combination means. However, at this time, the incident light guide may be damaged due to contact with the reflective liquid crystal display panel. Damage to the incident light guide can cause problems with incident light propagation. In order to prevent this problem, it is better to perform some damage prevention treatment on the contact portion of the incident light guide and the reflective liquid crystal display panel (at least the incident light guide or the reflective liquid crystal display panel or one of them). (e) Processing (e.g., light scattering pattern, overall roughening, etc.) for promoting emission is not limited to the method described in the embodiment. For example, it is advisable to carry out processing (light scattering pattern, overall roughening, etc.) only on the back side of the light guide plate, or on both the back side and the exit surface to facilitate emission. In addition, as for the method of forming the light scattering pattern, a method other than roughening can be used, for example, to form a large number of tiny dome-shaped protrusions. (If there are more than three types of dot-shaped light emitters arranged in the light input section, for example, the LEDs of the respective device forms such as red, green, and blue can be arranged in close proximity according to the description of the above embodiment .-- ------ ^ --------- (Please read the notes on the back before filling out this page) This paper size applies to China National Standard (CNS) A4 (210 X 297 public love) 15 312253 1221209 A7-_------------ B7 ^ V. Description of the invention (16) At this time, when the lighting mode is red, green and blue, the white color can be generated. According to the month, in contrast, a combination of color liquid crystal display panels can also be used. If the present invention is applied to the above-mentioned embodiment on the back, it can prevent the color balance of each part of the exit surface from being confused. In addition, it can also allow the LEDs of various colors to light The liquid crystal element of the bathroom is opened and closed at the same time to display the color. In addition, the same type of LEDs can be added to increase the light amount adjustment range. (G) In the above embodiment, in addition to the corners of the light source output section, actually, A light guide plate of uniform thickness is also used, but this point is not limited to this For example, a light guide plate with a wedge-shaped cross section can also be used. W In the above embodiment, the liquid crystal display device f installed on the mobile phone and the surface light source device arranged as a lighting device in the mobile phone have been described. It is not just an example That is, it means that the present invention can be widely used in the face-to-face source device or other various machines as a kind of lighting means. ⑴ As detailed in the above embodiments, the original responsibility of the present invention is to different kinds of devices. The point-like light-emitting configuration means that the display quality will not be affected by the change of the lighting state. Tsai ..., Yuekou mouth quality or therefore, the upper and outer forms are still feasible without violating the principle of the original intention. () (H) The deformation can be achieved by: for example, the illumination light from the light guide plate can be used to achieve various methods. For example, the light guide plate can be used to disperse the resin with a different refractive index to make the light guide plate. In addition, on the back of the light guide plate or the sub-substance-shaped groove-type emission means :: The paper size secret specifications: 〇x 217 ^ Public 16 312253 1221209 A7 —___ B7___ 5. Known in the description of the invention (Π) In addition, the present invention also allows the use of various optical components that have been previously used in surface light source devices, known as cymbals or diffusers, on light guide plates in a laminated manner. -------- ------------- ^ --------- (Please read the note on the back? Matters before filling out this page) Printed Agriculture

Claims (1)

1221209 Printed by the Staff Welfare Committee of the Central Bureau of Standards of the Ministry of Economic Affairs of the People's Republic of China No. 90103316 Patent Application Amendment to the Patent Scope. (February 17, 1993) L A surface light source device, which is a primary light source with a majority of point-shaped light emitters. A surface light source device that introduces light supplied by the aforementioned -secondary light source into a light guide plate and causes the exit surface of the light guide plate to emit light; wherein the aforementioned light guide plate has a back surface facing away from the exit surface and receives the primary light source At least one light input portion of the supplied light, the light input portion has a light path meander including an inclined surface inclined to the exit surface and the back surface, and an incident surface through which the light provided by the primary light source is incident. The light that is introduced into the light guide plate after the incident surface passes through the internal reflection of the inclined surface and proceeds into the light guide plate. Among the various point light emitters described above, there are at least two points of the respective device forms. The light-emitting body corresponds to one light input part, and at least two kinds of point-shaped light-emitting systems are correspondingly arranged along the corresponding direction. The projecting directions of the aforementioned incident surfaces in the normal line of the inclined plane are arranged in such a manner that positions close to each other supply light to the aforementioned incident surfaces, respectively. 2. For the surface light source device according to item 丨 of the application, the aforementioned incident surface is formed along the edge of the aforementioned light guide plate. 3. In the case of the surface light source device according to the scope of the patent application, the at least one light input portion is installed on at least one corner of the light guide plate. 4 · If the surface light source device of the scope of patent application No. 1, 2 or 3, the above (CNS) 14 specifications ------312253 1221209 Light output = In addition, the light supply paths of at least two kinds of point-shaped light emitters are respectively projected on the incident surface, which are almost consistent with each other. This kind of device does not use a surface light source device to illuminate the liquid crystal display panel. The surface light source device just described is provided with a variety of point-shaped light emitters ^ primary light sources, and the light supplied by the aforementioned primary light sources is introduced into the light guide plate. The light guide plate has a back surface facing away from the exit surface, and at least one light input unit that receives light supplied by the primary light source; The light input portion includes a light path zigzag portion including an inclined surface inclined to the exit surface and the back surface, and an incident surface through which light provided by the primary light source is incident. The incident surface is introduced into the light guide plate through the incident surface. The light is transmitted into the light guide plate after internal reflection of the aforementioned inclined surface. The Employee Welfare Committee of the Central Standards Bureau of the Ministry of Economic Affairs has printed out the above-mentioned various point-shaped light emitters, and there are at least 2 types of individual device forms. The dot-shaped light emitting body corresponds to one light input part, and at least two kinds of dot-shaped light emitting systems are aligned along the The positions of the projection directions of the aforementioned incident surfaces which are supposed to stand on the normal line of the aforementioned oblique surface are arranged in close proximity to each other and light is supplied to the aforementioned incident surfaces. 6. The display device according to item 5 of the scope of patent application, wherein the incident surface is formed along an edge of the light guide plate. 7 · If the display device in the scope of application for the patent No. 5 item, at least one of the aforementioned optical paper size is applicable to the Chinese National Standard (CNS) A4 Regulation (21〇χ ϋ mm) ---- 1 ~ —— · -1 2 312253 1221209 H3 The input part is installed on the corner of at least one of the light guide plates. 8. In the display device according to claim 5, 6, or 7, in each of the aforementioned light input sections, the projections of the light supply paths of the at least two point-shaped light emitters onto the incident surfaces are almost consistent with each other. Printed by the Staff Welfare Committee of the Central Bureau of Standards of the Ministry of Economic Affairs This paper is sized for the Chinese National Standard (CNS) A4 (210 X 297 mm) 3 312253