TW202340825A - Lcd device - Google Patents

Abstract

This invention provides an LCD display device without color filter thereon. A set of at least RGB LED chips, packaged inside one assembly housing, can be driven independently and provide backlight to a zone of a LCD display panel. The LCD panel includes a lower plate with TFT thereon, an upper plate with a transparent electrode thereon, and a liquid crystal layer between the lower and upper plates. Each pixel includes one TFT only, and the image can be displayed by using zone image display method. Polarizer plates can be a whole plate, zonewise or small pieces paste on the lower plate.

Description

LCD device

The present invention provides a liquid crystal display device, particularly a liquid crystal display that does not require a color filter.

A traditional monochrome LCD display includes a backlight module with a single wavelength or white light source, and an LCD panel. The knob of the liquid crystal in each pixel controls the gray scale value of the light source provided by the backlight, and the knob of the liquid crystal is controlled by a thin film transistor located on the lower substrate of the liquid crystal display panel, so that the intensity of light in each pixel Can be controlled by LCD.

In order to provide a color liquid crystal display, each pixel is divided into three sub-pixels, and a color filter is provided corresponding to each sub-pixel. Please refer to the first figure for a typical structure of an LCD panel. A traditional LCD panel includes an upper panel 10, a lower panel 14, a liquid crystal layer 20 between the upper panel 10 and the lower panel 14, and an upper polarizing plate. 18. A lower polarizing plate 16 and a color filter layer 18. A backlight module 30 provides white light to the liquid crystal display panel, thereby providing a liquid crystal display.

Compared with monochrome LCD displays, color LCD displays have very low backlight usage because red, green, and blue color filters will reduce the brightness of the LCD display by at least half. Furthermore, each image color contains three sub-pixels, and the resolution will also decrease accordingly.

A new technology provided by Sharp, Multi-Primary Color (MPC), is developed for wide color gamut (Wide Color Gamut; WCG). In addition to the three primary colors of red, green and blue, a yellow light filter is also added to a pixel of the LCD display. Therefore, the backlight The usage rate is even lower. Another technology includes not only using yellow light filters, but also using magenta and cyan color filters for a wide color gamut. For such a wide color gamut technology, the usage rate of backlight is even lower, and the power consumption of the LCD display will increase significantly.

Therefore, an invention is needed to solve the above-mentioned issues.

The main purpose of the present invention is to provide a color filter-free liquid crystal display. An LCD display includes a panel and a backlight module for illuminating the panel. The panel also includes a lower plate with a plurality of thin film transistors, an upper plate, and a liquid crystal layer located between the upper plate and the lower plate. The panel is divided into a plurality of areas (zones), and each area has a plurality of pixels. The backlight module includes a plurality of light-emitting diode assemblies for illuminating multiple areas, and each light-emitting diode assembly includes at least one red light-emitting diode chip, a green light-emitting diode chip, and Blue light emitting diode chip. Each zone displays an image through a zone image-display method, which includes a mixed-color pixel scanning method, a single-color pixel scanning method, And the single-color image interlace method. The area image display method takes advantage of the persistence of vision so that the three primary colors can be presented in a single pixel without the need for sub-pixels. Therefore, it is no longer necessary to divide each pixel into three sub-pixels.

An object of the present invention is to provide a device that saves power, has high backlight utilization rate, low thin film transistor (TFT) switching frequency, high resolution, and does not require a diffuser film. Because the surface glue of the light-emitting diode (LED) assembly can be roughened, it has a natural dimming function. In the present invention, a color filter-free liquid crystal display is provided, which has higher brightness, better color saturation, and lower backlight power consumption.

Another object of the present invention is to provide a liquid crystal display (LCD) that can achieve the resolution of a microlight emitting diode (microLED) display, and only needs to use currently mature thin This can be achieved using a thin film transistor liquid crystal display (TFT LCD) process. Because only three sub-pixels in the conventional technology can provide one color pixel, in the present invention each sub-pixel can provide a color pixel.

Accordingly, the present invention provides a liquid crystal display element, which includes a liquid crystal display panel having a lower plate, an upper plate and a liquid crystal layer located between the upper plate and the lower plate. The upper plate has a plurality of thin film transistors. On it, the lower plate has a transparent electrode on it, in which an image displayed on the liquid crystal display panel is divided into a plurality of areas; and a backlight module is used to provide light to the liquid crystal display panel, wherein the backlight module At least one solid-state light-emitting assembly of the group illuminates one area of the plurality of areas and includes at least one red, green, and blue light-emitting diode chip, wherein the image displayed by the liquid crystal display panel is an area image display method.

According to the liquid crystal display device according to an embodiment of the present invention, the above-mentioned area image display method includes a mixed color pixel scanning method, a single color pixel scanning method, and a single color area image overlapping method.

According to the liquid crystal display element according to an embodiment of the present invention, the above-mentioned mixed color pixel scanning method includes the steps of determining the intensity of red, green and blue of each pixel in the area; and sequentially and completely turning on the red, green and blue in the area. For each pixel, the solid-state lighting assembly simultaneously emits the determined red, green, and blue intensities sequentially and simultaneously during the duration of vision.

According to a liquid crystal display device according to an embodiment of the present invention, the above-mentioned solid-state lighting assembly provides grayscale values exceeding 8 bits.

According to a liquid crystal display device according to an embodiment of the present invention, the solid-state lighting assembly is driven by a pulse width modulation driving method.

According to the liquid crystal display device according to an embodiment of the present invention, the above-mentioned single-color pixel scanning method includes the steps of determining the intensity of red, green and blue for each pixel in the area; and according to the red/green color in the area. /The blue sequence completely turns on each pixel in the pixel scanning sequence, and at the same time, the solid-state lighting assembly sequentially in the pixel scanning sequence during the visual persistence time Simultaneously emit the determined red, green, and blue intensities.

According to the liquid crystal display element according to an embodiment of the present invention, the above-mentioned single-color area image overlapping method includes the steps of determining the intensity of red, green and blue of each pixel in the area; and grayscale based on the determination. value, the plurality of thin film transistors turn on all pixels in the red/green/blue sequence according to the intensity of the red, green and blue, and at the same time, the solid-state light-emitting assembly uses the red/green within the visual persistence time. The Green/Blue sequence simultaneously emits full intensity.

According to an embodiment of the liquid crystal display device of the present invention, a polarizer is applied to the area and is located on the lower plate.

According to a liquid crystal display device according to an embodiment of the present invention, a transparent resin of the solid-state light-emitting assembly includes a roughened surface.

According to a liquid crystal display element according to an embodiment of the present invention, the above-mentioned red, green and blue solid-state light-emitting chips are micro-light-emitting diode chips.

According to a liquid crystal display device according to an embodiment of the present invention, the above-mentioned red, green and blue solid-state light-emitting chips are flip-chip bonded to the assembly.

According to a liquid crystal display device according to an embodiment of the present invention, the above-mentioned solid-state light-emitting assembly includes diffusers in the transparent resin to smear out the positional factors of light in the solid-state light-emitting assembly.

According to a liquid crystal display element according to an embodiment of the present invention, the above-mentioned solid-state light-emitting assembly includes a white light-emitting diode chip, a yellow light-emitting diode chip, a cyan light-emitting diode chip, and a magenta light-emitting diode. chip and a cyan light-emitting diode chip.

According to a liquid crystal display device according to an embodiment of the present invention, the liquid crystal includes twisted nematic/super twisted nematic/lateral electric field effect display technology/multi-domain vertical alignment.

The present invention provides a method for displaying an image, including providing a liquid crystal display The monitor determines the intensity of red, green, and blue for each pixel in the area; and sequentially and completely turns on each pixel in the area, and at the same time, the solid-state lighting assembly emits sequentially and synchronously during the visual persistence time. This determines the intensity of red, green, and blue. The liquid crystal display includes a lower plate, an upper plate and a liquid crystal layer located between the upper plate and the lower plate. The upper plate has a plurality of thin film transistors on it. The lower plate has a transparent electrode on it, one of which The image presented on the liquid crystal display panel is divided into a plurality of areas; and a backlight module is used to provide light to the liquid crystal display panel, wherein at least one solid-state light emitting assembly of the backlight module illuminates one area of the plurality of areas. , and includes at least one red, green, and blue light-emitting diode chip.

According to a method of an embodiment of the present invention, the above-mentioned solid-state lighting assembly provides grayscale values exceeding 8 bits.

According to a method of an embodiment of the present invention, the solid-state lighting assembly is driven by a pulse width modulation driving method.

According to a method of an embodiment of the present invention, the solid-state lighting assembly includes a diffuser in the transparent resin to smear out the positional factors of light in the solid-state lighting assembly.

The present invention provides a method for displaying an image, including providing a liquid crystal display; determining the intensity of red, green and blue for each pixel in the area; and based on the determined grayscale value, through the plurality of The thin film transistor turns on all pixels in the red/green/blue sequence according to the intensity of the red, green and blue colors, and the solid-state light-emitting assembly simultaneously emits in the red/green/blue sequence within the visual persistence time. Full intensity. The liquid crystal display includes a lower plate, an upper plate and a liquid crystal layer located between the upper plate and the lower plate. The upper plate has a plurality of thin film transistors on it. The lower plate has a transparent electrode on it, one of which The image presented on the liquid crystal display panel is divided into a plurality of areas; a backlight module is used to provide light to the liquid crystal display panel, wherein at least one solid-state light emitting assembly of the backlight module illuminates one area of the plurality of areas, and includes at least one red, green, and blue light-emitting diode chip.

According to a method of an embodiment of the present invention, the solid-state lighting assembly includes a diffuser in the transparent resin to smear out the positional factors of light in the solid-state lighting assembly.

【00109】10:upper plate

【00110】12: Upper polarizer upper polarizer

【00111】14:lower plate

【00112】16: lower polarizer

【00113】18: color filter color filter

【00114】20: liquid crystal liquid crystal

【00115】30: backlight module backlight module

【00116】100: Package packager

【00117】102: Red light emitting diode R LED

【00118】104: Green light emitting diode G LED

【00119】106: Blue light emitting diode B LED

【00120】108: White light emitting diode W LED

【00121】110: epoxy resin

【00122】112: diffuser

The first picture is a schematic side view of a traditional LCD display.

The second figure A is a schematic top view of the backlight module of a region of the liquid crystal display according to an embodiment of the present invention.

Figure 2B is a schematic top view of the backlight module of a region of the liquid crystal display according to another embodiment of the present invention.

Figure 3A is a schematic side structural view of a light-emitting diode package backlight module in a region of a liquid crystal display according to an embodiment of the present invention.

Figure 3B is a schematic side structural view of a light-emitting diode assembly backlight module in a region of a liquid crystal display according to another embodiment of the present invention.

Figure 3C is a schematic side structural view of a light-emitting diode assembly backlight module in a region of a liquid crystal display according to another embodiment of the present invention.

The fourth figure is a schematic circuit diagram of a pixel including a thin film transistor and a liquid crystal capacitor according to an embodiment of the present invention.

Figure 5A is a schematic top view of a region on a liquid crystal display panel according to an embodiment of the present invention.

Figure 5B is a schematic structural diagram of a top view of an area of a liquid crystal display panel illuminated by a light-emitting diode package according to an embodiment of the present invention.

Figure 6A is a top view schematic diagram of the positions of all pixels in the area according to an embodiment of the present invention.

Figure 6B is a schematic top view of each grayscale value of all pixels in the area according to an embodiment of the present invention.

Figures 7A to 7C are top-view schematic diagrams of the operation of providing grayscale values of all pixels in an area at different stages according to an embodiment of the present invention.

The eighth figure is a top view schematic diagram of the operation of each grayscale value of all pixels in the area within the visual persistence time according to an embodiment of the present invention.

Figures 9A to 9C are top-view schematic diagrams of the operation of providing grayscale values of all pixels in an area at different stages according to another embodiment of the present invention.

Figure 10 is a top view schematic diagram of the operation of each grayscale value of all pixels in the area within the visual persistence time according to an embodiment of the present invention.

Figures 11A to 11C are top-view schematic diagrams of the operation of providing grayscale values of all pixels in an area at different stages according to another embodiment of the present invention.

Figure 12 is a top view schematic diagram of the operation of each grayscale value of all pixels in the area within the visual persistence time according to an embodiment of the present invention.

Figure 13 is a schematic side structural view of a liquid crystal display according to an embodiment of the present invention.

Figure 14 is a schematic side structural view of a liquid crystal display according to another embodiment of the present invention.

Accordingly, while several exemplary embodiments of the invention may be subject to various modifications and alternative types, these embodiments are shown in the drawings and are described in detail below. It should be understood, however, that the embodiments of the invention are not intended to be limited to the specific forms disclosed, but rather, the exemplary embodiments of the invention are intended to cover possible modifications within the scope of the invention. , and can replace it.

The following description explains the meanings of the words in the present invention to make the embodiments of the present invention clearer.

In the present invention, the solid-state light-emitting element may include a semiconductor light-emitting element, such as a light-emitting diode.

In the present invention, light-emitting diode refers to a light-emitting diode chip, that is, a light-emitting diode chip that has not yet been packaged.

In the present invention, a light-emitting diode assembly or a light-emitting diode package means that a light-emitting diode chip is packaged in a casing or assembled on a substrate.

In the present invention, the color filter refers to the outermost layer in the liquid crystal display panel used to filter white light into red light, green light, and blue light respectively.

In the present invention, the regional display method refers to the display of images that can independently generate images in a region. Therefore, each area has its own driving element to control the backlight element in the area and all the pixels of the liquid crystal display in the liquid crystal display device of the present invention.

In the present invention, the diffuser refers to the particles mixed in the light-emitting diode package to emit the light generated by the light-emitting diode chip uniformly.

In the present invention, a diffuser film refers to a film used in a liquid crystal display panel to enhance backlight brightness.

In the present invention, wafer surface roughening refers to converting the light-emitting diode wafer surface from a smooth surface into an irregular structure, so that light can more easily transmit inside the light-emitting diode wafer without being lost due to total reflection. Confined inside the light-emitting diode. At the same time, through surface roughening, the light-emitting angle of the light-emitting diode chip can also be greatly increased.

In the present invention, the roughened surface of the adhesive material refers to the roughened surface of the transparent adhesive material in the light-emitting diode package or on the light-emitting diode assembly. The adhesive material can be epoxy resin or silicone.

In the present invention, gray scale refers to different intensities of monochromatic light.

In the present invention, brightness refers to different intensities after light mixing.

In the present invention, luminous intensity refers to the power of output light.

In the illustrations, the dimensions of each element and the corresponding dimensions between each element may be exaggerated for clarity. The same or similar reference numerals that follow the description of the figures represent the same or similar elements or components, and only the descriptions correspond to independently different embodiments.

The present invention provides a color liquid crystal display without a color filter. All colors are provided directly by the backlight without the need for color filters. In the present invention, the liquid crystal can play the role of completely turning on and off a pixel, or controlling the grayscale value in a pixel.

In the backlight module of the present invention, solid-state luminescent lighting is mainly used as the backlight source. Current solid-state light-emitting lighting components are mainly semiconductor lighting components, and common commercial semiconductor lighting is mainly light-emitting diodes. In a preferred example of the present invention, mini LEDs are used, and the colors of the display are directly displayed through the colors of the LEDs. The package size of the millimeter light-emitting diode in the present invention has a side length of less than 1 mm. Compared with traditional color LCD monitors, colors are determined by color filters. However, the manufacturing process of color filters is quite complicated and not very stable. Therefore, even the color LCD monitors of the same product from the same manufacturer have slight differences in color. This can be directly seen in many electronic product hypermarkets. In the present invention, since the wavelength of the color of the light-emitting diode directly displays the image, it is determined during the epitaxial process of the light-emitting diode, and a specific color can be selected through probing and sorting. wavelength of light-emitting diodes. Therefore, the uniformity of the display's color and brightness performance can be completely standardized. That is to say, the colors displayed by any two LCD monitors are exactly the same.

In addition, colors are displayed by light-emitting diodes, and the performance of color space (CIE; Commission internationale de l'éclairage) and color rendering (CRI; Color Rendering Index) can be better than that of current color LCD monitors. Traditional color LCD display In the device, the white light provided by the backlight, whether it is a cold cathode ray tube (CCFL) or a white LED light-emitting diode, is ultimately determined by a color filter. Therefore, color filters determine the color space or color rendering. However, no matter how the backlight technology using light-emitting diodes evolves, even if quantum dot technology is used to increase the backlight spectrum of visible light, the color filter will eventually reduce the color space that the backlight can provide. Therefore, multi-primary color display technology is currently available, and this type of technology that adds yellow light filters appears. However, this method of increasing color space or color rendering comes at the cost of reducing backlight efficiency. In the present invention, red light, green light and blue light-emitting diodes are directly used to generate color and brightness, which directly corresponds to the human eye's color recognition of the three primary colors. Not only does the backlight usage efficiency increase by not using color filters, but it can also provide direct color recognition of the three primary colors through the color recognition of the human eye. The backlight efficiency will be better than traditional LCD displays that use color filters, and the color The display will be more vivid and stable.

In the present invention, a zone (zone) is defined in the liquid crystal display, which is determined by the size and common illumination range (angle) of a light-emitting diode package. Each zone can correspond to a plurality of pixels, and a The LCD display is composed of multiple areas. For example, an area may have 3x3 pixels, 8x6 pixels, or other sizes. The pixels covered by an area are mainly determined by the package size and thickness of the light-emitting diode. Each light-emitting diode package contains at least one red light, one green light and one blue light-emitting diode chip.

In the present invention, the display of the image is mainly presented through the zone image display method (zone image display method) of the persistence of human vision. The present invention provides two ways to present the image. One of them is to achieve the purpose of image output by fully opening each pixel in the area sequentially within the visual persistence time of the human eye, and at the same time, the backlight provides the corresponding color mixing and brightness of the corresponding pixel according to the sequence of pixels. . Since the twisting response of the traditional liquid crystal in the gray scale value is slower than the response of fully open and fully closed, in the present invention, through the full rotation of the liquid crystal, Turning it on or off can make the video playback on the monitor smoother. In addition, the grayscale value for controlling color is determined by the light-emitting diode. By driving the light-emitting diode through pulse width modulation (PWM; Pulse Width Modulation), the grayscale value can easily exceed that of a traditional liquid crystal display. 8-bit grayscale value. This allows the LCD display to provide the same high grayscale value as a traditional cathode ray tube (CRT; Cathode Tube Ray) display, allowing images to be displayed with higher color richness than existing LCD displays.

In one embodiment of the invention, a zone is illuminated by an LED backlight assembly. However, an area can be illuminated by two or more backlight components if the image of the area can be displayed within the time frame of vision persistence.

Another type of display method is that the backlight in the entire zone only provides a single color at a time, such as red light. At the same time, the LCD panel controls the grayscale value of each pixel in the area. During the duration of the human eye's vision, the backlight of the three primary colors is presented sequentially, allowing the human eye to produce the entire image. In this way, although the grayscale value of each color will be the same as that of a traditional LCD display, only 8 bits, the LCD in the entire area only needs to be turned on three times during the time the human eye stays. For driving images It will be simpler. In addition, this method will make it easier to present images if an area has more pixels. Compared with the previous method, when an area has too many pixels, it is a challenge to completely turn on and off each pixel sequentially within the persistence time of human vision. Furthermore, if you want to add other colors, such as yellow, it will only increase the control of the liquid crystal by all pixels in the entire area.

The above image driving methods all take advantage of the rapid emission characteristics of light-emitting diodes. Therefore, there is no problem at all with LCD switches. The liquid crystal can use any traditional liquid crystal, such as twisted nematic (TN; Twisted Nematic) liquid crystal, super twisted nematic (STN; Super Twisted Nematic), vertical alignment (VA; Vertical Alignment), multi-domain vertical MVA (Multi-domain Vertical Alignment), lateral electric field effect display technology (IPS; In-Plane Switching), or any other application of liquid crystal to display images can be used.

In the present invention, like the traditional technique, the liquid crystal layer is located between the lower plate and the upper plate. In addition, it will also include polarizing plates, alignment films and other materials and components used in traditional LCD displays, in addition to color filters. In order to avoid confusing the present invention, other components related to the traditional liquid crystal display panel are not explained and are not shown in the drawings.

Since the present invention does not use color filters, the entire liquid crystal display has as many resolutions as there are pixels. Compared with the traditional color liquid crystal display, the resolution of the liquid crystal display of the present invention can be three times that of the traditional color liquid crystal display, and can even reach the resolution of a light-emitting diode display.

The detailed operations and embodiments of the present invention are described with reference to the figures.

Please refer to Figure 2A, which is a schematic top view of a light-emitting diode package. The light-emitting diode package 100 may include a red light-emitting diode chip 102 and a green light-emitting diode chip 104. and a blue light emitting diode chip 106. The red light-emitting diode chip 102, the green light-emitting diode chip 104, and the blue light-emitting diode chip 106 are assembled in the package 100, and can be joined to the package by traditional methods, such as flip-chip bonding or wire bonding. Engagement. In this embodiment, the grayscale value composition of red light, green light, and blue light in the light-emitting diode package 100 determines the color and brightness of each pixel in this area.

In one embodiment, millimeter LED dies are suitable. In current technology, micro-LED displays will face the problem of mass transfer, but milli-LED displays are currently a commercially viable solution. Although the millimeter LED chip has a larger area than a pixel of a traditional LCD and cannot be directly applied to high-resolution displays, by controlling the color and color of all pixels in a single area of the LCD, Brightness, millimeter LED backlight modules used in LCD displays are still feasible.

The size of an area, or the package size of an LED, depends on the size and light-emitting angle of the LED die, the light exit angle of the LED package, and the required backlight brightness. In order to provide uniform backlight (smear out position factor) and uniform color mixing in an area, diffusers (diffusors) or glue can be added to the light-emitting diode package to roughen the surface. The driving method of the light-emitting diodes can be traditional current driving or pulse-width modulation (PWM; Pulse-Width Modulation). In a specific embodiment, pulse-width modulation is preferred. Because it can provide higher grayscale values.

Please refer to Figure 2B. The present invention can not only provide red, green, and blue light-emitting diode chips, but also light-emitting diodes of other colors. A white light emitting diode 108 may also be incorporated into the package 100 in one embodiment to increase brightness contrast. Therefore, red, blue and green light emitting diodes and one white light emitting diode 108 are used as a group in one area to provide backlight. Other embodiments include red, blue, and green light-emitting diodes and a yellow light-emitting diode (not shown in the figure) as a group in an area to provide backlight. Not only four light-emitting diode dies can be assembled in one package, but six light-emitting diodes can also be combined into a group, such as red light-emitting diodes, green light-emitting diodes, and blue light-emitting diodes. , yellow light-emitting diodes (not shown in the figure), magenta (magenta) light-emitting diodes (not shown in the figure) and cyan (cyan) light-emitting diodes (not shown in the figure) can also be assembled in a package. Another embodiment includes red, blue, and green light-emitting diodes and a turquoise light-emitting diode as a group in one area to provide backlight, or other combinations.

Please refer to FIG. 3A , which is a schematic side view of the light-emitting diode package of the present invention, in which the light-emitting diode chips 102 and 106 are packaged in a package 100 . In this embodiment, an important purpose of the light emitting diode package 100 is to provide a larger emission angle to cover a larger area. The emission angle of the bare chip of the light-emitting diode 102 is approximately 120 degrees, and the light emission angle can be increased by roughening the surface of the light-emitting diode chip and the package surface. For example, it can be increased to greater than or equal to 140 degrees. The light emitted by the light-emitting diode chip can also be uniformly mixed through the diffuser 112, and the obliquely emitted light can be converted into uniform emission in all directions. The emission angle can also be increased through the shape of the optics or package. In this embodiment, the walls of the enclosure cannot be designed to be too high and have an inclined angle. The light-emitting diode package can be injected with a transparent adhesive material, such as epoxy resin or siloxane, after the light-emitting diode chips are bonded. The diffuser is mixed with the transparent glue and injected into the light-emitting diode package. In the present invention, there is no need for any phosphor or quantum dots to participate in light mixing because no color conversion is required. In addition, in order to increase the angle of light emission, the light-emitting diode package does not need to have walls but only a substrate, as shown in Figure 3B, for example. In Figure 3B, the transparent adhesive material 110 is located above the package body 101, covering all the light-emitting diodes. In this embodiment, it is a chip on board (COB) application.

Even with the diffuser, specific areas on the surface of the light-emitting diode assembly will be brighter, or a certain color in specific areas will be more vivid. In Figure 3B, there is still bright red light directly above the red light-emitting diode 102, which will cause the overall light mixing of the entire light-emitting diode assembly to be uneven. For a solution, please refer to Figure 3C. In order to increase the uniformity of the light emission angles of each color of light in the light-emitting diode assembly, the surface of the transparent adhesive material 110 can be roughened, as shown in Figure 3C. This refers to the surface roughening of the light-emitting diode assembly, not the wafer surface roughening of the light-emitting diode wafer. This is important. After the surface of the assembly is roughened, the red light can shine evenly on the entire surface of the assembly. The same applies to other colors of light. For the light-emitting diode package in Figure 3A, the surface can also be roughened after filling the transparent adhesive material.

Please refer to Figure 4, which shows a schematic circuit diagram of a thin film transistor (TFT) and liquid crystal for one pixel in a liquid crystal display. In the present invention, the driving method of the liquid crystal display is the same as that of the traditional liquid crystal display. The gate of a thin film transistor is electrically connected to the scanning line and connected In response to the turn-on command, the source is connected to the signal line and receives the potential to turn on the liquid crystal to the drain. The drain electrode is connected to the control electrode of the liquid crystal capacitor, and the other electrode of the liquid crystal capacitor is connected to ground. The two electrodes of the liquid crystal capacitor are both transparent electrodes. In the present invention, there are two ways of driving liquid crystal. One is to turn the liquid crystal in the pixel fully on or fully off, and the backlight module directly provides light with gray scale values. The other is the same as the traditional one. The liquid crystal directly provides control of the grayscale value of the pixel, while the backlight module provides light with full brightness. One of the electrodes of the liquid crystal capacitor is electrically connected to the drain of the thin film transistor and is located on the lower plate of the LCD panel, while the other is grounded and located on the upper plate.

See Figure 5A, which shows an area of the lower panel of an LCD monitor. An area covers multiple pixels, and each pixel is driven by a thin film transistor. In the embodiment of Figure 5A, an area is composed of 5x15 pixels, with a total of 75 pixels, that is, the resolution of an area is 75 pixels. Unlike traditional color LCD displays, there will only be 5x5 pixels, and only 25 pixels in total. The upper left corner of each pixel has a thin film transistor just like a traditional LCD. The area in the middle of the pixel is the transparent electrode of the LCD, which serves as the control electrode of the liquid crystal capacitor. In addition, the LCD panel will include an upper plate and a liquid crystal layer in the middle. The upper plate has a transparent electrode as a grounding electrode for the liquid crystal capacitor.

Referring to FIG. 5B , a package with a red LED 102 , a green LED 104 , and a blue LED 106 is located under an area of a liquid crystal display panel. In this area, the color grayscale values of all pixels are directly provided by red, green, and blue light-emitting diodes. Due to the light emission angle of the LED, the area of a region can be slightly larger than one LED package, depending on the distance between the LED package and the LCD panel. Since the backlight can directly provide mixed light of the three primary colors, to the human eye, compared to the traditional LCD display that uses white light as the backlight source, it will have better color saturation (color saturation) or can provide a wider range of colors. Domain (wide color gamut). same It will also provide better brightness. Also because three primary color light-emitting diodes are directly used, there is no need to use multi-primary color display technology in the present invention. Even with multi-primary color display technology, backlight usage is relatively efficient.

In addition, a polarizing film can be attached to the outside of each light-emitting diode package. Since the cost of the polarizer is not low, if a small area is defective when applied to the entire display, the entire polarizer will have to be scrapped. However, in the present invention, the polarizer sheet can be attached in a single area, so the manufacturing yield of the polarizer sheet can also be improved. Of course, the entire polarizer can also be attached in the traditional way.

The display method mainly adopts the zone image displaying method, which presents images through the persistence of vision of the human eye. There are three display methods, mixed-color pixel scanning method, single-color pixel scanning method, and single-color image interlaced method.

First, the mixed-color pixel scanning method is introduced. Mainly in the area, during the visual persistence time, each pixel is completely turned on and off in sequence, and the backlight simultaneously provides mixed-color backlight according to the duration of the pixel being turned on. In this embodiment, when the liquid crystal of the first pixel is in a fully-on state, the backlight provides the red, green, and blue light values of the first pixel. Since the liquid crystals of all other pixels are turned off, the other pixels are black. Since the LCD of the first pixel is fully turned on, the red, green, and blue light values provided by the backlight determine the color value and brightness of the first pixel, so at this time the grayscale value of a single color is no longer determined by the LCD. Determined by the state of the knob. When the first pixel's transistor turns the liquid crystal fully off, the second pixel's transistor turns the liquid crystal fully on, and the backlight provides the second pixel's red, green, and blue values. Continue in this order until all pixels are turned on and off. And all the pixels in the entire area, starting from the first pixel From turning on to the last pixel, as long as the human eye's vision persists, you can see the image of an area. Because the response speed of light-emitting diodes is quite fast, it is much faster than the response speed of traditional liquid crystals. At present, the response speed of liquid crystal is 1-2 milliseconds at the fastest, but the response speed of light-emitting diodes can be 10-9 seconds. In addition, the response speed of the liquid crystal is the fastest only when it is fully open and fully closed. If it is only in gray scale value, the response speed will be slower. In traditional LCD displays, if the response speed of the liquid crystal is not fast enough, for example, when the mouse slides over, you will see the trajectory of the comet tail. Or when the image changes too quickly, the video playback will also be blurred (mura). Through the present invention, this problem can also be eliminated. In addition, when the liquid crystal of the pixel liquid crystal has not been completely turned off, the light-emitting diode corresponding to the pixel can be completely extinguished. In this way, not only can the contrast of the image be increased, but also fast-moving videos can be played.

Additionally, the present invention eliminates the need to use color filters to produce color. Since the color filter manufacturing process is not very uniform and stable, this will cause two traditional LCD displays to have the same color performance even if they are made using exactly the same process. At this time, we can only go back and repair the difference in the color filter of each LCD display through the circuit that drives the liquid crystal. However, through the present invention, since there is no color filter, every LCD monitor produced will only have the same color performance and higher brightness.

For detailed image driving methods, please refer to the following diagrams.

For example, please refer to FIG. 6A , in which one area may cover nine pixels in this embodiment. In the present invention, how many pixels a region can correspond to depends on the size of the region. In this embodiment, nine pixels are just for convenience of illustration. These nine pixels are (1,1), (1,2), (1,3), (2,1), (2,2), (2,3), (3,1), (3 ,2), and (3,3) to express. In this area, if a certain image is represented by these nine pixels, these nine pixels will have corresponding grayscale values of the three primary colors. Therefore, first define the grayscale values of the colors of the nine pixels in this area, which are (R11, G11, B11), (R12, G12, B12), (R13, G13, B13), (R21,G21,B21), (R22,G22,B22), (R23,G23,B23), (R31,G31,B31), (R32,G32,B32) and (R33,G33,B33) , as shown in Figure 6B, where (R11, G11, B11) represents the grayscale value of each of the three primary colors located in pixel (1,1). In a traditional LCD display, these nine pixels need to use thin film transistors to turn on or off the liquid crystal state of 81 pixels in order to express the color values of a total of 9 pixels.

See Figure 7A for the way the image is presented. First, the liquid crystal of the first pixel (1,1) is fully turned on, and the other eight pixels are all turned off. At this time, the three light-emitting diodes of the area's backlight provide the grayscale values of the three primary colors (R11, G11, B11) corresponding to one pixel, and then turn off the liquid crystal and backlight of the first pixel. Please note that turning off the LED is relatively fast. Here, the LCD is fully on and fully off, and there is no grayscale on for the LCD. The grayscale values of the three primary colors are directly determined by the light-emitting diodes of the backlight. This also reduces the burden of the grayscale value of the liquid crystal, and not only solves the problem of the slow response speed of the liquid crystal. Since all other pixels are turned off, the human eye sees the mixed light effect of the grayscale values of the three primary colors (R11, G11, B11) at the position of the first pixel (1,1).

After that, please refer to Figure 7B, the LCD of the second pixel (1,2) is fully turned on, and the LCD of the other eight pixels is turned off, and when the second pixel is turned on, the backlight is converted to provide (R12, G12, B12) grayscale value. Then turn off the second pixel's LCD, as well as turn off the backlight. At this time, to the human eye, the mixed light of the grayscale values of the three primary colors (R12, G12, B12) will be seen in the second pixel (1,2). This pattern continues until the last pixel (3,3), as shown in Figure 7C.

Figure 8 shows the opening and closing of different pixels in different time domains during the persistence time of human vision. The abscissa represents time, and the ordinate represents which pixel is completely on or off. In the first period, only the first pixel is on, and all other pixels are off. The second time after that, only the second pixel is on, and the other pixels are off. And so on until the ninth pixel. And this whole time must be in the human eye It is completed within the visual persistence time, and the human eye will see a complete image in this area. This type of image presentation method is similar to the traditional cathode ray tube image display method, which also scans the entire image sequentially within the duration of human vision.

In this embodiment, there is no need to turn on and off sequentially according to the coordinates of each pixel. For example, first turn on the first pixel (1,1), and then turn on the fifth pixel (2,2). There is an advantage to this. If the response speed of the liquid crystal is not fast enough, this method can allow non-adjacent pixels to be turned on one after another, increasing the pixel contrast of the image. For an area with too many pixels, this would be a possible solution. Therefore, the order of the pixels is irrelevant, as long as each pixel is turned on and off once during the pause time of human vision.

In the present invention, the gray scale value provided by driving the light emitting diode through pulse width modulation can be greater than 8 bits, such as 10 bits or 12 bits, or even more than 12 bits. Current LCD displays are limited by the angle of the LCD knob. Commercial LCD displays on the market can only provide 8-bit grayscale values. Therefore, there are only 256 grayscale values for each color (including full light and full dark). Through the driving method of light-emitting diodes, the gray scale value that can be provided can be greater than 8 bits, and the color mixing value provided in this way can be much greater than the color mixing value provided by the liquid crystal display. This method has an advantage, because in order for the LCD display to display gray scale, the turning angle of the liquid crystal must be controlled. Even with the best lateral electric field effect display technology (IPS; In-Plane Switch) technology, the current gray scale is only 8-bit grayscale. The combined full color is only 160,000 colors. However, through this embodiment of the present invention, the grayscale of each color can be presented by using pulse width modulation on the light-emitting diodes, so in addition to the 8-bit grayscale, a 10-bit grayscale can also be provided. Yuan's gray scale (1024 gray scale values), the combined full color has 1 billion colors, which allows the LCD display to provide richer colors. Even, through good LED driving, 12-bit gray scale (4096 gray scale value) can be achieved, and such full color can reach 6.8 billion colors. Such color richness can be compared with traditional cathode ray displays.

Another embodiment is to first process the red grayscale value of each pixel sequentially, then process the green grayscale value of each pixel sequentially, and finally process the blue grayscale value of each pixel sequentially. This method is a single-color pixel scanning method, which scans through a single color of each pixel. When all the colors are completed within the duration of human vision, an image appears to the human eye.

The same as the previous embodiment, there are 9 pixels in one area, and the grayscale value of each pixel's respective color must first be determined. After that, please refer to Figure 9A, first turn on the first pixel (1,1), and the backlight only provides the red grayscale value located at the first pixel (R11,0,0). At this time, the backlight does not participate in light mixing. Then each pixel is turned on and off in sequence, and the backlight module provides the red grayscale value of each pixel in sequence until the last pixel (R33,0,0), as shown in Figure 9B. Then, in the same way, each pixel is turned on in sequence again, and the backlight only provides the green grayscale value corresponding to each pixel in the order of the pixels. Finally, in the same way, each pixel is turned on again in sequence, and the backlight only provides the blue grayscale value corresponding to each pixel in the order of the pixels. When providing the blue grayscale value (0,0,B33) of the last pixel, as shown in Figure 9C, it must be completed within the persistence time of human vision.

The operation of each pixel during the persistence time of human vision can be seen in Figure 10, in which each pixel is still fully on and fully off. In this embodiment, since there is no light mixing, each pixel needs to be turned on three times.

In this embodiment, the order of the colors is not important, that is, the scan of green for each pixel of all pixels in the area can be turned on first, followed by blue, and finally red. Even colors can be mixed and matched. For example, the first pixel can be turned on first and the backlight provides a red light grayscale value, and then the fifth pixel can be turned on and the backlight can provide a blue light grayscale value. As long as it is within the duration of human vision, the spatial order in which the pixels are turned on and the order in which the colors are turned on are not important.

Another example of driving images is the single-color image interlaced method. Similarly, first determine the grayscale values of all colors for each pixel in an area. At the beginning, the backlight only provides red light, and it is the red light that provides maximum brightness. At the same time, each pixel of the LCD in the area controls the grayscale value of the red light of the respective pixel, as shown in Figure 11A. Afterwards, the backlight only provides maximum brightness green light, and each pixel in the area controls the green grayscale value of its respective pixel, as shown in Figure 11B. Finally, the backlight only provides maximum brightness blue light, while each pixel in the area controls the blue light grayscale value of its respective pixel, as shown in Figure 11C. The operation of each pixel during the persistence time of human vision can be seen in Figure 12. During the stage when the red light is turned on, each pixel turns on its own grayscale value at the same time. Therefore, the grayscale value of each pixel is not the same in this embodiment, depending on the required grayscale value of the image. Similarly, in this embodiment, the order in which the colors are turned on is not important, but the overlap of the monochromatic images within the duration of human vision. In the third embodiment, the gray scale value of the color is still determined by the liquid crystal, but the resolution is the same as the first two, both can have high resolution, and there is no need to use color filters.

[00100] In the above embodiments, the present invention provides a liquid crystal display that does not require a color filter, as shown in Figure 13. Each light-emitting diode package 100-1 and 100-2 corresponds to two areas of the liquid crystal display. Each light-emitting diode package 100 contains at least red, green, and blue light-emitting diode chips. Two polarizing plates 16-1 and 16-2 respectively cover the corresponding two light-emitting diode packages 100-1 and 100-2. The liquid crystal display panel includes a lower plate 14 and an upper plate 10 . The lower plate 14 has a thin film transistor in each pixel to control the degree of opening or closing of the liquid crystal in each pixel. There is a liquid crystal layer between the upper plate 12 and the lower plate 14, and the upper plate 12 is covered with a polarizing plate 12. The driving force of the image is mainly to display the image in the area through the human eye's vision. Through the combination of areas, all required images can be displayed completely. The light-emitting diode package corresponding to each area and the thin film transistor in the area can It has its own driving device, or several light-emitting diode packages and regional thin film transistors corresponding to several regions can share a driving device.

[00101] For another embodiment, please refer to Figure 14. The light-emitting diode assemblies 100-3 and 100-4 have a chip-on-board (COB) structure. All light-emitting diode chips are directly printed on the substrate, and transparent resin seals each area.

[00102] In the present invention, the black color provided by the liquid crystal display will be darker than that of the traditional liquid crystal display, because the backlight in the traditional liquid crystal display is always fully turned on, and the liquid crystal display panel will still turn off all the backlight. There is some light leakage occurring. This is particularly noticeable when viewing an LCD monitor in a completely dark room. In order to make current LCD displays have better black presentation, local dimming technology is also used. The first two embodiments of the present invention have their own dimming function, which can be said to be natural dimming, and do not require traditional local dimming technology. In the third embodiment, local dimming technology can also be applied. For example, in a zone, if the backlight of a certain color in this zone is relatively dark, you can lower the brightness of this color.

[00103] In the present invention, since there is no color filter, the backlight is used more efficiently. No matter which embodiment is used to present the image display method, lower power consumption can be achieved. Moreover, the light-emitting diodes are dynamically driven and can have lower power consumption when the image is not high-brightness.

[00104] Since there is no color filter, if the brightness provided by the backlight is the same as the traditional requirement, such an LCD display will have at least three times the brightness of a traditional LCD display.

[00105] Since there is no color filter, each pixel can directly provide three primary colors without providing three sub-pixels like a traditional LCD display. Compared with traditional LCD displays, the resolution can be increased three times. Thus, a thin film transistor can directly control a pixel.

[00106] Compared with traditional LCD displays, which use mixed-color pixel scanning or single-color pixel scanning, the driving method of the LCD panel is relatively simple and does not require the use of grayscale control. The driving device can have lower manufacturing cost.

[00107] Since the colors come directly from the three primary colors of the light-emitting diodes, the display of the image can have better color saturation. Compared with traditional LCD displays, color saturation is determined by the backlight and color filters. When the spectrum provided by the backlight is not rich enough, the color saturation displayed through the color filter will be reduced a lot. The most obvious example is that current LCD monitors tend to be relatively weak in the presentation of gold.

[00108] The above-described embodiments are only for illustrating the technical ideas and characteristics of the present invention. Their purpose is to enable those skilled in the art to understand the contents of the present invention and implement them accordingly. They should not be used to limit the scope of the present invention. The patent scope, that is, all equivalent changes or modifications made in accordance with the spirit disclosed in the present invention should still be covered by the patent scope of the present invention.

102:Red light emitting diode

104:Green light emitting diode

106:Blue light emitting diode

Claims (10)

A liquid crystal display component including: A liquid crystal display panel has a lower plate, an upper plate and a liquid crystal layer located between the upper plate and the lower plate. The upper plate has a plurality of thin film transistors on it, and the lower plate has a transparent electrode on it. , wherein an image presented on the liquid crystal display panel is divided into a plurality of areas; A backlight module is used to provide light to the liquid crystal display panel, wherein at least one solid-state light-emitting assembly of the backlight module illuminates one of the plurality of areas and includes at least one red, green, and blue light-emitting diodes. A three-dimensional chip, wherein the image displayed by the liquid crystal display panel is an area image display method. As for the liquid crystal display element shown in patent scope 1, the above-mentioned area image display method includes a mixed color pixel scanning method, a single color pixel scanning method and a single color area image overlapping method. As for the liquid crystal display element shown in patent scope 2, the above-mentioned mixed color pixel scanning method includes the following steps: Determine the intensity of red, green, and blue for each pixel in the area; and Each pixel is fully turned on in the area sequentially, and the solid-state lighting assembly sequentially and synchronously emits the determined intensities of red, green, and blue during the visual persistence time; The above-mentioned solid-state lighting assembly is driven by a pulse width modulation driving method and provides grayscale values exceeding 8 bits. As for the liquid crystal display element shown in patent scope 2, the above-mentioned single-color pixel scanning method includes The steps included are: Determine the intensity of red, green, and blue for each pixel in the area; and In this area, each pixel is fully turned on in the pixel scanning sequence in the order of red/green/blue. At the same time, the solid-state lighting assembly synchronously emits the determined red and green colors in the pixel scanning sequence during the visual persistence time. And the intensity of the blue. As for the liquid crystal display device shown in patent scope 2, the above-mentioned single-color area image overlapping method includes the following steps: Determine the intensity of red, green, and blue for each pixel in the area; and According to the determined gray scale value, the plurality of thin film transistors are used to turn on all pixels in the red/green/blue sequence according to the intensities of the red, green and blue, and at the same time, the solid-state light-emitting assembly is maintained in the visual persistence Full intensity is emitted simultaneously in this red/green/blue sequence over time. The liquid crystal display element shown in patent scope 2 further includes a polarizer suitable for this area and located on the lower plate, wherein the red, green and blue solid-state light-emitting chips are micro-light-emitting diode chips, flip-chip Bonded to the assembly, wherein the solid state light emitting assembly includes diffusers in the transparent resin and includes a roughened surface. For example, the liquid crystal display element shown in patent scope 6, wherein the solid-state light-emitting assembly includes a white light-emitting diode chip, a yellow light-emitting diode chip, a cyan light-emitting diode chip, and a magenta light-emitting diode. chip and a cyan light-emitting diode chip. A method for displaying an image, including: A liquid crystal display is provided, which includes: A lower plate, an upper plate and a liquid crystal layer are located between the upper plate and the lower plate. The upper plate has a plurality of thin film transistors on it. The lower plate has a transparent electrode on it, one of which is present on the The image on the liquid crystal display panel is divided into multiple areas; A backlight module is used to provide light to the liquid crystal display panel, wherein at least one solid-state light-emitting assembly of the backlight module illuminates one of the plurality of areas and includes at least one red, green, and blue light-emitting diodes. bulk chip; Determine the intensity of red, green, and blue for each pixel in the area; and Each pixel in the area is fully turned on sequentially, and the solid-state lighting assembly sequentially and synchronously emits the determined intensities of red, green, and blue during the visual persistence time. A method for displaying an image, including: A liquid crystal display is provided, which includes: A lower plate, an upper plate and a liquid crystal layer are located between the upper plate and the lower plate. The upper plate has a plurality of thin film transistors on it. The lower plate has a transparent electrode on it, one of which is present on the The image on the liquid crystal display panel is divided into multiple areas; A backlight module is used to provide light to the liquid crystal display panel, wherein at least one solid-state light-emitting assembly of the backlight module illuminates one of the plurality of areas and includes at least one red, green, and blue light-emitting diodes. bulk chip; Determine the intensity of red, green, and blue for each pixel in the area; and According to the determined gray scale value, the plurality of thin film transistors are used to adjust the red, green and and blue intensity, turning on all pixels in the red/green/blue sequence, while the solid-state light-emitting assembly simultaneously emits full intensity in the red/green/blue sequence within the visual persistence time. For the methods described in items 8 and 9 of the patent application, the solid-state lighting assembly includes a diffuser.

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