TW202001377A - Display device and the driving method thereof - Google Patents

Abstract

A display device including backlight module, light valve groups located on the backlight module is provided, and every light group includes sub pixels. The backlight module includes light emitting arrays, and the light emitting array includes light emitting areas disposed along a first direction. The position of every light emitting arrays is corresponded to the position of one of the light valve groups, and the sub pixels of the light valve group are disposed along a second direction, and the first direction and the second direction are not parallel. When the light emitting areas of the light emitting array is emitting light, the illuminating light of every light emitting areas can illuminate multiple sub pixels. A driving method of the display device is also provided.

Description

Display device and its driving method

The invention relates to a display device and a driving method thereof, in particular to a display device with a direct type backlight and a driving method thereof.

In the existing display technology, the related technology of Light Emitting Diode (LED) has become one of the protagonists. The technologies that occupy the main position in the light-emitting diode market include liquid crystal display (LCD) technology using light-emitting diodes as backlight and organic light emitting diode (Organic Light Emitting Diode, OLED) display technology. Improve these display technologies in terms of picture contrast, color quality, and picture brightness.

For example, when a light emitting diode is used as a backlight module of a surface light source, the liquid crystal display technology will affect the appearance of black due to light leakage and other phenomena, and even affect the overall contrast of the screen. In addition, in order to make the display image more detailed, the existing device further manufactures miniaturized light-emitting diodes to individually illuminate each pixel. However, since the current of the light-emitting diode and the control voltage transmitted by the driving circuit of the light-emitting diode exhibit a non-linear relationship, it is difficult to adjust by the control voltage signal. If the miniaturized light source corresponding to each sub-pixel is increased, the complexity of the overall circuit will increase with the number of miniature light-emitting diodes. Therefore, when the display device uses miniaturized light-emitting diodes as the light source of the display pixels, it is difficult for the display device to increase its resolution due to the above-mentioned problems. Therefore, how to make a better and better display technology by using light-emitting diodes is one of the main problems that the display technology wants to solve.

An object of the present invention is to provide a display device which can provide multiple different colors and bright and dark in each pixel to provide a display screen with richer colors.

The display device of the present invention includes a backlight module and a plurality of display pixels on the backlight module, and each display pixel includes a plurality of sub-pixels.

The backlight module includes a plurality of light-emitting arrays, and the light-emitting array includes a plurality of light-emitting areas arranged along the first direction. The position of each light-emitting array corresponds to the position of one of the display pixels, and the sub-pixels of the display pixels are arranged along the second direction, and the first direction is not parallel to the second direction. When the light emitting area in the light emitting array illuminates the light beam, the illumination light beam provided by each light emitting area may illuminate multiple sub-pixels.

The display device of the present invention includes a plurality of display units, each display unit includes a light-emitting array and a display pixel including a plurality of sub-pixels, and the sub-pixels of the display pixels are disposed on the light-emitting array.

The light-emitting array includes a plurality of light-emitting regions arranged along the first direction, and the sub-pixels are arranged along the second direction, and the first direction and the second direction are not parallel to each other. When the light-emitting areas in the light-emitting array provide illumination beams, the illumination beams provided by each light-emitting area may illuminate multiple sub-pixels.

The method for driving a display device of the present invention includes providing grayscale data including a plurality of grayscale values; obtaining the maximum value of these grayscale values in each grayscale data; generating a light emission control signal according to the size of the maximum value; providing light emission control A signal to one of the light-emitting arrays to determine the number of light-emitting areas in the light-emitting array; and providing gray-scale data to the plurality of sub-pixels corresponding to the light-emitting array, these sub-pixels are adjusted according to the gray-scale values in the received gray-scale data Transmittance.

With the above display pixels, the display device of the present invention can have good performance in the details of color and brightness, and thereby provide a detailed display screen.

A, B, C

111‧‧‧ Subpixel

d1, d2‧‧‧ direction

111G‧‧‧ display pixels

S‧‧‧Display

113‧‧‧ light valve

100‧‧‧Display device

115‧‧‧Color filter

110‧‧‧Display unit

120‧‧‧Lighting array

120M‧‧‧Backlight module

121‧‧‧Lighting area

130‧‧‧sequence control circuit

131‧‧‧ First data drive circuit

132‧‧‧ Second data drive circuit

133‧‧‧First data line

134‧‧‧ Second data line

135‧‧‧ LED

136, 139‧‧‧ switch

137、138‧‧‧Power cord

1 is a schematic diagram of a display device according to a first embodiment of the present invention; FIGS. 2A to 2C are exploded schematic diagrams of a display pixel according to the first embodiment of the present invention; FIG. 3 is a schematic top view of the display pixel according to the first embodiment of the present invention FIG. 4A is a schematic flowchart of the driving method of the display device according to the first embodiment of the present invention; FIG. 4B is a system schematic diagram of the display device according to the first embodiment of the present invention.

The display device provided by the present invention can be applied to, for example, a computer, a TV, an advertising wall, etc. as a display screen, and can also be applied to a portable device, such as a tablet computer, a smart phone, and the like. FIG. 1 is a schematic diagram of a display device 100 according to a first embodiment of the present invention. For the sake of clarity, local elements are omitted in the local area of the display device 100, and area A omits elements above the sub-pixel. The area B omits the elements above the light emitting array, and the area C enlarges the area A and the area B. The relative positions of the elements in the display device 100 of this embodiment will be described clearly with reference to these schematic diagrams.

The display device 100 of the first embodiment of the present invention can provide a screen on the display surface S, for example, and the screen is composed of a plurality of display pixels 111G. Each display pixel 111G includes a plurality of sub-pixels 111, and the light-emitting array 120 is located under these sub-pixels 111. In other words, the distribution areas of these display pixels 111G correspond to the positions of the light emitting array 120, and the light emitting array 120 is positioned to illuminate the sub-pixels 111 of the display pixel 111G, and serves as the light source of the sub-pixels 111 in the display pixel 111G.

For example, the light emitting arrays 120 may jointly form a backlight module 120M, and provide a light source below the plane where the sub-pixels 111 are arranged, that is, the backlight module 120M provides a direct light source. However, the present invention is not limited to the embodiments of the light-emitting arrays 120, and those skilled in the art can provide light sources with the same effect in the display device 100 through other embodiments.

Referring back to FIG. 1, the light-emitting array 120 of the first embodiment of the present invention includes a plurality of light-emitting regions 121, and the arrangement of the light-emitting regions 121 in each display pixel 111 is different from the arrangement of the sub-pixels 111. The light emitting regions 121 are arranged along the first direction d1, and the sub-pixels 111 are arranged along the second direction d2. In other words, the first direction d1 is different from the second direction d2, and they are not parallel to each other.

For example, the sub-pixel 111 of this embodiment is composed of a light valve and a color filter, wherein the light valve is preferably a transmissive light valve such as liquid crystal . The light emitting area 121 is formed by, for example, a light emitting surface of a light emitting diode. Preferably, the light-emitting region 121 of this embodiment is composed of, for example, a miniature light-emitting diode (mini or micro LED, mini or μLED), a light-emitting diode, or an organic light-emitting diode. The present invention is not limited to the element types of the light-emitting area 121 and the sub-pixel 111. In other embodiments, other elements that can provide the same optical effect can be used.

On the other hand, please refer to the partially enlarged view in FIG. 1, the number of these sub-pixels 111 in the display pixel 111G of this embodiment is three, for example, that is, every three sub-pixels 111 are formed in the display device 100 to correspond to The number of display pixels 111G of the light-emitting array 120, and the number of light-emitting regions 121 of the light-emitting array 120 are also three. For example, the three sub-pixels 111 in each display pixel 111G have different chromaticities (Chrominance), the above three chromaticities It preferably corresponds to the optical primary colors used for display. Further, the display device of this embodiment includes a plurality of display units 110, and each display unit 110 includes a display pixel 111G and a light emitting array 120. In each display unit 110, the distribution area of the display pixels 111G overlaps with the distribution area of the light-emitting array 120, and the sub-pixels 111 in the upper layer and the light-emitting areas 121 in the lower layer are arranged along different directions.

For further clarity, the detailed features of the display device of this embodiment will be described below with a single display pixel. Further, the light emitting array 120 of this embodiment can display the brightness of the display unit 110 with a variety of different lighting effects, that is, gray level. The following will explain in order.

2A-2C are exploded schematic diagrams of the display unit and the light emitting array in the first embodiment of the present invention. 2A, the light beam provided by the light emitting area 121 of the light emitting array 120 can illuminate the sub-pixels 111. Taking the sub-pixel 111 shown in the figure as an example, the sub-pixel 111 includes a light valve 113 such as a liquid crystal and a color filter 115, and the illumination beam L from the light-emitting area 121 passes through these elements in sequence.

When the light-emitting array 120 lights only one light-emitting area 121, only a part of each sub-pixel 111 will be illuminated by the illumination light beam L, so the display unit 110 may present a gray level with lower brightness. In other words, the light-emitting array 120 that lights the single light-emitting area 121 determines in advance that the display unit 110 should present a gray level with lower brightness, and then further controls the color and the transmittance of the illumination light beam L by the sub-pixel 111 to further improve The display unit 110 displays the color type and the number of gray levels when displaying a low-luminance screen.

2B, when the light-emitting array 120 lights only two light-emitting areas 121, a larger area of the light valve 113 and the color filter 115 of each sub-pixel 111 is illuminated by the illumination beam L, so the display unit 110 can Grayscale with higher brightness.

Referring to FIG. 2C, when the light emitting array 120 lights up all the light emitting regions 121, the light valve 113 of the sub-pixel 111 and the color filter 115 are illuminated by the illumination light beam L the largest, so the display unit 110 can present the grayscale with the highest brightness .

In other words, the light-emitting array 120 can initially control the gray scale of the display unit 110 by controlling the number of light-emitting areas 121, and then further control the color and light transmittance by the sub-pixel 111. Therefore, the display device 100 can provide an appropriate light source corresponding to the light-emitting array 120 of each display unit 110 through the display units 110, no matter when providing low, medium or high brightness images. By further controlling the light transmittance of these sub-pixels 111, the display unit 110 can greatly increase the number of gray levels and colors that the display device 100 can provide.

In other words, with the light-emitting arrays 120 proposed by the present invention, the gray scale of the image screen can be controlled not only by the display pixels 111G such as liquid crystals, but also by the light-emitting areas 121 of each light-emitting array 120 in the backlight module 120M To adjust the backlight intensity and further adjust the gray scale of the screen.

The display device of this embodiment is described below with another perspective. FIG. 3 is a schematic diagram of the display unit 110 according to the first embodiment of the present invention drawn from a top view, in which the elements above the light emitting array 120 are omitted. Please refer to FIG. 3. In the light emitting array 120 of this embodiment, the light emitting area 121 emits an illumination beam from a light emitting surface. Further, FIG. 3 is a schematic diagram according to the above-mentioned light-emitting surface, wherein the light-emitting regions 121 are arranged along the first direction d1, and the light-emitting surfaces of the light-emitting regions 121 are also substantially distributed on the light-emitting surface.

The above-mentioned display pixels are disposed on the light-emitting regions 121, and the regions 111A of the plurality of sub-pixels 111 projected on the light-emitting surface of the display pixels overlap and intersect with the distribution regions of the light-emitting regions 121. For example, the projection area 111A of each sub-pixel 111 on the light-emitting surface overlaps with the distribution area of the three light-emitting areas 121, so each sub-pixel 111 (refer to the projection area 111A) can form, for example, three sub-areas 111B (marked in the figure) One of them), the sub-pixel 111 corresponding to the sub-region 111B can receive the light beam from one of the light-emitting regions 121, and the entire sub-pixel 111 can receive the light from different light-emitting regions in different regions. Therefore, the overall brightness of the sub-pixel 111 can be determined by determining the number of lighting of the light-emitting area 121.

The shape of the light-emitting regions 121 in this embodiment is a rectangle whose long sides are perpendicular to the first direction d1, and the shape of the sub-pixels 111 across the light-emitting regions 121 is a rectangle whose long sides are perpendicular to the second direction d2. A plurality of rectangular or square sub-regions 111B are formed on the sub-pixel 111. Further, since the sub-regions 111B have the same area size, for example, the display unit 110 can provide good hierarchical brightness control.

However, the present invention is not limited to the shapes of the light-emitting area 121 and the sub-pixel 111 described above. In other embodiments, the sub-pixels may be formed in other shapes, and the light-emitting region may be formed in another shape correspondingly to simultaneously illuminate the sub-pixels. On the other hand, in the display unit 110 of the first embodiment of the present invention, the arrangement direction d1 of the light emitting regions 121 is perpendicular to the arrangement direction d2 of the sub-pixels 111, so that the above-mentioned sub-regions 111B having the same area size are preferably formed, In order to provide good staged brightness control. However, the present invention is not limited to this. In other embodiments, the arrangement direction of the light-emitting area 121 and the arrangement direction of the sub-pixels 111 may include other angles. Those skilled in the art can follow the shape or display of the light-emitting area 121 and the sub-pixels 111 The demand for pixels adjusts the above arrangement direction.

Further, the intensity of the illumination beams emitted by the light-emitting regions 121 in this embodiment are similar, so the light-emitting regions 121 in the light-emitting array 120 are interchangeable. By controlling the number of lighting of the light emitting regions 121 in the light emitting array 120, the brightness range of the display unit 110 can be adjusted.

The driving method of the display device proposed by the present invention will be further described below. Please refer to the flowchart of the driving method shown in FIG. 4A. The display device of the first embodiment of the present invention first provides a gray scale data (step S1), and the gray scale data can control one of the above display pixels. The gray scale data includes multiple gray scale values, and these gray scale values can individually control the light transmittance of each sub-pixel of the display pixel. For example, the gray scale value of this embodiment is positively correlated with the light transmittance of the sub-pixel, but the invention is not limited thereto.

On the other hand, the grayscale value with the largest value in the grayscale data is taken out (step S2), and a light-emitting control signal is generated according to the grayscale value (step S3). For example, when the light-emitting array of the display pixels has three light-emitting areas, the numerical range of the gray-scale value will be divided into three intervals, each of which corresponds to one, two, and three light-emitting areas to be lit Luminescence control signal. Therefore, after obtaining the maximum grayscale value in the grayscale data, the corresponding light-emitting control signal is provided according to the interval in which the grayscale value falls, so as to control the number of light-emitting areas in the display pixel.

In other words, the display device of this embodiment determines the light-emission control signal according to the sub-pixel of the display pixels that has the highest brightness requirement. For example, the numerical range of the gray scale value for controlling the light transmittance of the sub-pixel is between 0 and 255, for example, and the decision of the light emission control signal can be based on the following rule: when the maximum value of the gray scale value in the gray scale data When it falls in the range of 0 to 155, the light-emitting control signal can light one light-emitting area; when the maximum value of the gray scale value falls in the range of 156 to 212, the light-emitting control signal can make the two light-emitting areas light; when gray When the maximum value of the order value falls within the range of 213 to 255, the light-emitting control signal can light up the three light-emitting areas.

According to the above rules, each gray level value can correspond to a light emission control signal.

On the other hand, please refer to the schematic diagram of the system shown in FIG. 4B. The grayscale data of the display device 100 is transferred to the first data driving circuit 131 through the timing control circuit 130 (Timing controller). The first data driving circuit 131 Passed to the sub-pixel of each display pixel via the first data line 133. At the same time, the light emission control signal generated according to the gray-scale data is also transmitted to the second data driving circuit 132 via the timing control circuit 130, for example, and the second data driving circuit 132 transmits the light emission control signal to each display pixel via the second data line 134. The light emitting area 121 (step S4). In other words, when a grayscale data is to be provided to a display unit, the first data driving circuit 131 can transfer the grayscale data to the display pixels through the first data line 133; the second data driving circuit 132 can pass the The two data lines 134 transmit the light-emitting control signal to the light-emitting array displaying pixels.

Please refer to a partially enlarged view in FIG. 4B. The light-emitting area 121 of this embodiment is provided with a light-emitting diode 135, for example, and the switch 136 connected to the second data line 134 is connected to the power line of the light-emitting diode 135. Switch 139 between 137 and 138. Therefore, the gray-scale data can simultaneously control the light transmittance of the sub-pixels in one display pixel, and at the same time can control the number of light-emitting areas in the display pixels to provide a good picture.

Furthermore, the display device of the present embodiment can further add a correction to the maximum value after obtaining the maximum value of the gray scale value, for example, by using the curve of Gamma 2.2 to obtain a correction maximum value. Then, according to the corrected maximum value, a light-emitting control signal is generated to control the number of light-emitting areas in the light-emitting array.

For example, the relationship between the maximum value of the gray scale value and the corrected maximum value is as follows: Y (corrected maximum value) = A×X ^2.2 where A is a constant and X is the maximum value of the gray scale value. The maximum value of the gray scale value can be converted to the corrected maximum value according to the above relationship, and then the light emission control signal is determined according to the value of the corrected maximum value. Therefore, the display device of this embodiment can provide a display screen that is most suitable for human vision through the above-mentioned driving method.

In summary, the display device of the present invention can control the brightness of the illumination beam in advance through the above-mentioned light-emitting array, and then subdivide the light transmittance through the sub-pixels. In other words, the number of light-emitting areas in the light-emitting array is matched with the light transmittance control of the sub-pixels, and the display device can greatly improve the details of brightness and color. The driving method of the display device of this embodiment can directly determine the number of light-emitting areas in the light-emitting array corresponding to each sub-pixel according to the gray-scale data to be provided to the sub-pixels, so it can be based on the application of the existing display device Grayscale data to further provide a more vivid and detailed display.

d1, d2‧‧‧ direction

110‧‧‧Display unit

111‧‧‧ Subpixel

111G‧‧‧ display pixels

113‧‧‧ light valve

115‧‧‧Color filter

120‧‧‧Lighting array

121‧‧‧Lighting area

Claims (9)

A display device includes: a plurality of display units, each of which includes: a light-emitting array including a plurality of light-emitting areas arranged along a first direction; and a display pixel disposed on the light-emitting array; wherein, The display pixel includes a plurality of sub-pixels, the plurality of sub-pixels are arranged in a second direction, the second direction is not parallel to the first direction, each light-emitting area provides an illumination beam to illuminate all the plurality of sub-pixels of the display pixel, And each of the sub-pixels has a plurality of sub-regions, and the sub-regions in the same sub-pixel respectively receive corresponding illumination beams generated by different light-emitting regions in the light-emitting array. According to the display device described in item 1 of the patent application scope, in each of the sub-pixels, the areas of the plurality of sub-regions are substantially the same. The display device according to item 1 of the patent application scope, wherein in each display unit, the plurality of light-emitting areas of the light-emitting array emit the illumination beam from a light-emitting surface; the plurality of sub-pixels are projected onto the area of the light-emitting surface The regions where the plurality of light-emitting regions are distributed on the light-emitting surface overlap and intersect each other, wherein the region where each sub-pixel is projected onto the light-emitting surface overlaps with the regions where the plurality of light-emitting regions are distributed on the light-emitting surface. The display device as described in item 1 of the patent application range, wherein the light-emitting regions are formed into rectangles and each have a first long side perpendicular to the first direction; the sub-pixels are respectively formed into rectangles and each has a second The long side is perpendicular to the second direction; each sub-pixel spans above the plurality of light-emitting areas. The display device according to item 1 of the patent application scope, wherein the first direction and the second direction are substantially perpendicular to each other. A method for driving a display device as described in any one of claims 1 to 5 includes: providing a gray scale data, the gray scale data including a plurality of gray scale values; in each gray scale data Obtain the maximum value of the plurality of gray-scale values; generate a light-emitting control signal according to the size of the maximum value; provide the light-emitting control signal to one of the plurality of light-emitting arrays, and determine the light-emitting area in the light-emitting array The number of lights; and providing the gray-scale data to the plurality of sub-pixels corresponding to the light-emitting array, the plurality of sub-pixels adjusting transmittance according to the plurality of gray-scale values in the received gray-scale data. The driving method as described in item 6 of the patent application scope, wherein in the step of determining the number of light-emitting signals, the method further comprises: performing code correction on the maximum value to generate a corrected maximum value; and determining the light emission according to the corrected maximum value Control signal. The driving method as described in Item 6 of the patent application scope, wherein the step of determining the light emission quantity signal further comprises: determining a plurality of numerical intervals within the gray scale value receiving range of the plurality of sub-pixels, the plurality of numerical intervals corresponding to different The light-emitting control signal; wherein when determining the light-emitting control signal, the light-emitting control signal is determined according to the value range to which the maximum value belongs. The driving method as described in Item 6 of the patent application range, wherein the transmittance adjusted by the plurality of sub-pixels according to the received gray scale value is positively related to the magnitude of the gray scale value.

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