TWI364596B - Liquid crystal display device and light source module thereof - Google Patents

Description

Two-face number: TW3743PA IX. Description of the invention: [Technical field to which the moon belongs] The present invention relates to an I bottle __/ 颂 及其 及其 and its light source module, and the device and the light source thereof Module/''', liquid crystal display without color saturation picture [Prior Art] In recent years,

In many small display devices, a cold cathode fluorescent tube (light emitting diode) can be used as a light source. The volume of the scorpion body is small and the pollution is low, and a one-page display product has been gradually applied recently. Most of the displays use white light to illuminate one's color with a color filter for color display. Taking the color saturation control of the liquid crystal display as an example, the color saturation of this type of product depends on the spectrum and color filter of the white light emitting diode. The purity of the light sheet. However, since the purity of most color filters is not high, the overall penetration of the display is poor. In addition, when the color filter is used, the purity of the light-emitting spectrum of the white light-emitting body is not south. 'It will reduce the effect of the display. 1364596

The present invention relates to a liquid crystal display device and a light source module thereof, which utilizes a filtering device to filter out visible light having a specific spectrum in a light source, so that the liquid crystal display device displays a better color effect. . The invention provides a liquid crystal display device, which comprises: a liquid crystal panel, a light source module and a filtering device. The light source module includes at least one light source disposed on one side of the liquid crystal panel. The filtering device is disposed between the liquid crystal panel and the light source module, and the filtering device is configured to filter visible light of one of the light emitted by the light source. The invention further provides a light source module, the module comprising at least one light source and a filtering device. The filtering means is adapted to filter out one of the light emitted by the illumination source. In order to make the above description of the present invention more comprehensible, the preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings: FIG. A schematic diagram of a liquid crystal display device of a preferred embodiment. As shown in FIG. 1, the liquid crystal display device 1 includes a liquid crystal panel 100, a light source module 120, and a filtering device 140. The light source module 120 is disposed on one side of the liquid crystal panel 100. The light source module 120 includes at least one light source source disposed on one side of the liquid crystal panel 100 to provide a light source to the liquid crystal panel 100. The filtering device 140 is disposed between the liquid crystal panel 100 and the light emitting side of the light source module 120 for filtering visible light of one of the light sources provided by the light source of the light source module 120. 1364596

Sanda number: TW3743PA The liquid crystal panel 100 includes an upper substrate 1〇1 and a lower substrate 103', wherein the upper substrate 101 and the lower substrate 103 are disposed in parallel with a liquid crystal layer (not labeled) interposed therebetween. The substrate 101 above the liquid crystal panel 100 may be a color filter substrate 'which includes a color filter structure 105. The color filter structure includes a plurality of red filter layers 105R, a green filter layer 105G and a blue filter layer 105B (for simplicity of illustration, only one color filter layer is illustrated). The light source module 120 is disposed on the lower substrate 103 side, and the filtering device 140 is disposed between the light source module 120 and the lower substrate 103. The light source of the light source module 120 of the embodiment includes a plurality of white light emitting diodes 121. The light source module 120 further includes a reflective plate 123 and a back frame 125. The white light emitting diode 121 and the reflective plate 123 are disposed in the back frame 125, and the white light emitting diode 121 is disposed on the reflective plate 123. After the white light emitting diode 121 is driven to emit light, the light is reflected by the reflecting plate 123 in the back frame 125 to be dispersed by the opening on the back frame 125. These white light emitting diodes 121 each include a blue light emitting chip and a yellow phosphor. The white light emitting diodes 121 are mainly driven to emit blue light by the blue light emitting chip and to illuminate the yellow fluorescent powder by blue light, so that the blue light and the excited yellow light are mixed into a white light LW. The filter device 140 can be disposed on the light exiting side of the light source module 12 or the light incident side of the liquid crystal panel for filtering the white light LW generated by the light source module 12 . Please refer to FIG. 2, which illustrates the schematic of the filtering device of FIG. As shown in Fig. 2, the filtering device 14 includes a plurality of first material layers 141 and second material layers 143 which are disposed in an overlapping manner. The multilayer structure composed of the first material layer H1 and the second material layer 143 can be used for 1364596

'Three mil: TW3743PA White light LW produces a beaded-Bragg grating effect that allows visible light to penetrate or reflect with a specific spectrum. Table 1 _-i thickness (nano) refractive index first material layer tantalum nitride (SiN) 292.34 2.3 second material layer cerium oxide (Si 〇 2) 1169.37 1.4 first material layer 141 and second material layer 143 The materials and characteristics are shown in Table 1. The total thickness of the first material layer 141 and the second material layer 143 is about 2 cm. The filtering device 140, which is designed according to the parameters shown in Table 1, is about to adjust the filtered spectrum to about 580 nm, that is, the filtering device 14 滤 filters the visible light having a wavelength of about 580 nm. Please refer to the third to fourth figures. FIG. 3 is a diagram showing the optical spectrum of the red, green, blue filter layer and the white light emitting diode when the liquid crystal display device is not equipped with the filter device. FIG. A penetrating spectrum diagram of a red, green, blue filter layer and a white light emitting diode of the liquid crystal display device of FIG. 1 is shown. In Fig. 3, the curve CR is the penetration spectrum of the red filter layer i〇5R, the curve CG is the penetration spectrum of the green filter layer 105G, and the curve CB is the penetration spectrum of the blue filter layer 105B, and the curve CW Then, it is the light emission spectrum of the white light emitting diode 121. The curve CW of the light-emitting spectrum of the white light-emitting diode 121 composed of the blue light-emitting chip and the yellow phosphor powder exhibits a double-band waveform. The transmission spectrum of the blue filter layer 105B and the green filter layer 105G intersect at a wavelength of about 480 to 500 nm, because the light-emitting spectrum of the white light-emitting diode 121 is in the wavelength range (480 to 500 nm) 1364596 .. • < _ «

No. 3: TW3743PA has a low light mixing ratio, so when the white light LW penetrates the blue light-passing layer 105B and the green filter layer 105G, the characteristics of blue and green can be clearly displayed. In addition, the light-emitting spectrum of the white light-emitting diode 121 has a high light-mixing ratio in the visible light having a wavelength range of 560 to 600 nm, and the mixed light of the visible light in this band is yellowish green. However, the penetration spectrum of the red filter layer 105R and the penetration spectrum of the green filter layer 105G also intersect at a wavelength of about 580 nm, so that the yellow-green light of this band affects the red® filter layer 105R and the green filter. The color of the light layer 105G is presented. As shown in FIG. 4, after the filter device 14 is disposed in the display device 1, the filter device 140 filters out the yellow-green light in the white light LW in the 560-600 nm band, thereby adjusting the white light-emitting diode 121. The illuminating spectrum of the white light LW is emitted. The curve CW of the adjusted white light LW' is very low in light efficiency close to 580 nm, and the curve cw which is originally a double band is converted into a three-band curve CW'. The three-band curve CW has a higher mixing ratio at the peaks of the corresponding φ lines CR, CG, and CB, so that the red filter layer 105R, the green filter layer 105G, and the blue filter layer 105B can each be made. Do not display better red, green and blue. As a result, the color saturation of the liquid crystal display device 1 can be increased. Please refer to Figure 5, which shows a CIE1931 color coordinate map. In Figure 5, the range I is shown in the standard gamut range as defined by the National Television System Committee (NTSC). Range III is a liquid crystal display device which conventionally displays color with a color filter, which is approximately 45% NTSC. Scope II is 1364596

Sanda number: TW3743PA Embodiment The color gamut range of the liquid crystal display device 1 is about 55% NTSC. Therefore, a chopper device 140 is provided in a liquid crystal display device having a color enamel and a light film, and the gamut range displayed by the liquid crystal display device can be surely increased. Preferably, the filtering device 140 can be fabricated as a filter structure with a filter function. When the other optical film of the liquid crystal display device 1 is assembled, the filter device 140 is also mounted on the optical film. Please refer to Fig. 6, which is a schematic view showing the liquid crystal display device of Fig. 1 including an optical film. As shown in FIG. 6, the liquid crystal display device 1 further includes a plurality of optical films 150 (only one optical film 15 is shown for simplicity of illustration), and the optical film 150 may be a brightness enhancement plate, a diffusion plate, or the like. Or a combination thereof. The filter and wave device 140 is disposed between the optical film 150 and the liquid crystal panel 1B. The filter device 140 can be incorporated in the liquid crystal display device 1 when the optical film 150 is assembled. Of course, the chopper device 140 can also be disposed between the optical film 150 and the light source module 120. The position of the filtering device 140 can also vary depending on the design of the different light source module 120. Referring to Figure 7, another schematic diagram of the liquid crystal display device of Figure 1 is shown. As shown in FIG. 7, the light source module 120' of the liquid crystal display device is disposed under the liquid crystal panel 100, but the white light emitting diode 12 of the light source module 120' is disposed on one side of the back frame 125'. And located on the side of the light guide plate 160. The white light of the white light emitting diode 12 is led upward through the light guide plate 160 and the reflecting plate 123' disposed under the light guide plate 160, and then passed through the optical film 150 to be transferred to the liquid crystal panel 100. The filter device 140' is disposed on the side of the light guide plate 160 or on the light incident side of the light guide plate 160. The filter device 140' can also be disposed on the light source module .120' to emit light 1364596..

The three-dimensional number: TW3743PA surface, or any position between the light source module 120' and the liquid crystal panel 100 can effectively play the role of filtering to further improve the color saturation of the liquid crystal display device. Alternatively, the filter device 140' may be disposed on the surface of the light source, such as on the LED light exit surface, or on the surface of the package. The liquid crystal display device and the light source module thereof disclosed in the above embodiments of the present invention are provided with a filtering device in the liquid crystal display device or the light source module thereof, so that the light source is guided to the liquid crystal panel after passing through the filtering device. Among the white light generated by the white light emitting diode of the light source module, the yellow-green light having a wavelength of 560 to 600 ® nanometer is filtered by the filtering device. When the white light of the penetrating filter device is matched with the red, green and blue filter layers in the liquid crystal panel, the liquid crystal display device has better color performance. In view of the above, the present invention has been disclosed in the above preferred embodiments, which are not intended to limit the invention. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the invention. Therefore, the scope of the invention is defined by the scope of the appended claims. < S ) 11 1364596

Three ILL No.: TW3743PA 'A Brief Description of the Drawings FIG. 1 is a schematic view showing a liquid crystal display device in accordance with a preferred embodiment of the present invention. Fig. 2 is a schematic view showing the filtering device of Fig. 1. Fig. 3 is a view showing the optical spectrum of the red, green, blue filter layer and the white light-emitting diode of the liquid crystal display device of Fig. 1 when the filter device is not provided. Fig. 4 is a view showing the penetration spectrum of the red, green, blue filter layer and the white light emitting diode of the liquid crystal display device of Fig. 1. • Figure 5 shows a CIE1931 color coordinate plot. Fig. 6 is a view showing the liquid crystal display device of Fig. 1 including an optical film. FIG. 7 is another schematic view of the liquid crystal display device of FIG. 1. [Description of main component symbols] 1. Γ: liquid crystal display device 100. liquid crystal panel * 101: upper substrate 103: lower substrate 105: color filter structure 105R: red filter layer 105G: green filter layer, 105B: blue Filter layer 120: light source module 121, 12Γ: white light emitting diode 12 1364596

Sanda number: TW3743PA 123, 123': reflectors 125, 125': back frame 140, 140': filter device 141: first material layer 143: second material layer 150: optical film 16 0. light guide plate LW, LW,: white light

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Claims (1)

1364596 __ , January 11, 101 nuclear replacement page 10, the scope of application patent: 1. A liquid crystal display device, comprising: a liquid crystal panel; a light source module, at least one light source is disposed in one of the liquid crystal panels And a filtering device disposed between the liquid crystal panel and the light source for filtering visible light of one of the light emitted by the light source, the filtering device comprising a plurality of first material layers and a plurality of a second material layer, each of the first material layers being overlapped with each of the second material layers, wherein the first material layers are made of tantalum nitride (SiN) and the first material layers are different The refractive index is about 2.3, and the material of the second material layer is cerium oxide (SiO 2 ), and the wavelength of the visible light is between 560 nm and 600 nm. 2. The liquid crystal display device of claim 1, wherein the liquid crystal panel has a color filter comprising a red, green and blue phosphor layer. 3. The liquid crystal display device of claim 1, wherein the illumination source comprises a plurality of white light emitting diodes. 4. The liquid crystal display device of claim 3, wherein the white light emitting diodes each comprise a blue light emitting chip and a yellow phosphor. 5. The liquid crystal display device of claim 1, wherein the sum of the thicknesses of the first material layer and the second material layers is about 2 cm. 〇 〇 : : ; ; ; ; ; ; ; ; ; ; ; ; ; 液晶 液晶 液晶 液晶 2012 2012 2012 2012 2012 2012 2012 2012 2012 2012 2012 2012 2012 2012 2012 2012 2012 2012 液晶 液晶 液晶 液晶 液晶 液晶 液晶 液晶 液晶 液晶 液晶 液晶 液晶 液晶 液晶 液晶 液晶The respective thicknesses of the first material layers are about 292.34 nm. 7. The liquid crystal display device of claim 5, wherein the second material layers each have a refractive index of about 1.4. 8. The liquid crystal display device of claim 5, wherein each of the second material layers has a thickness of about 1169.37 nm. 9. The liquid crystal display device of claim 1, wherein the filtering device is disposed on a light exiting side of the light source module. 10. The liquid crystal display device of claim 1, wherein the filtering device is disposed on a light incident side of the liquid crystal panel. 11. The liquid crystal display device of claim 1, wherein the filtering device is disposed on a surface of the light source. 12. The liquid crystal display device of claim 1, further comprising: at least one optical film disposed between the light source module and the liquid crystal panel, the filtering device being located in the optical film side. 13. The liquid crystal display device of claim 12, wherein the filtering device is located between the optical film and the liquid crystal panel. 14. The liquid crystal display device of claim 12, wherein the filtering device is located between the optical film and the light source module. 15. A light source module comprising at least one illumination source; and a filtering device comprising a plurality of first material layers and a plurality of second material layers, each of the first material layers and each of the second material layer layers Overlap design 09614749, 7 1013012979-0 .. 1364596 _ 101 January 101 revised replacement page 2012/1/11_1SI Reagent & correction, the filter device is suitable for one of the light emitted by the illumination source The visible light is filtered, wherein the material of the first material layer is tantalum nitride (SiN) and the refractive index of each of the first material layers is about 2.3, and the materials of the second material layers are cerium oxide ( Si02), the wavelength of the visible light is between 560 nm and 600 nm. 16. The light source module of claim 15, wherein the illumination source comprises a plurality of white light emitting diodes. 17. The light source module of claim 16, wherein the white light emitting diodes each comprise a blue light emitting chip and a yellow phosphor. 18. The light source module of claim 15, wherein the sum of the thicknesses of the first material layer and the second material layers is about 2 centimeters. 19. The light source module of claim 18, wherein each of the first material layers has a thickness of about 292.34 nm. 20. The light source module of claim 15, wherein the second material layers each have a refractive index of about 1.4. 21. The light source module of claim 20, wherein each of the second material layers has a thickness of about 1169.37 nanometers. 22. The light source module of claim 15, wherein the filtering device is disposed on a light exiting side of the light source module. 23. The light source module of claim 15, wherein the filtering device is disposed on a surface of the light source. 096147497 1013D12973-0 16