TWM569880U - Touch display module and display driver thereof - Google Patents

Abstract

A touch display module and a display driver thereof are provided. The touch display module includes a touch display panel and the display driver. The display driver is coupled to the touch display panel. The display driver includes a grayscale voltage generator and a driving circuit. The grayscale voltage generator generates a first grayscale voltage set. The driving circuit receives a display data and a mode signal. The driving circuit is coupled to the grayscale voltage generator to receive the first grayscale voltage set and converts the display data into a plurality of driving signals according to the first grayscale voltage set, so as to drive the touch display panel to display a frame. The driving circuit adjusts at least one of display brightness and display color of a specific pattern of the frame in response to the mode signal.

Description

Touch display module and its display driver

The creation of this new type relates to a display technology, and in particular to a touch display module with a partial screen high-brightness mode and its display driver.

In order to increase the screen-to-body ratio of the display, the off-screen fingerprint sensing technology has become a trend. In short, the off-screen fingerprint sensing technology is to arrange the fingerprint sensor below the display screen of the electronic device. After the electronic device detects that the user touches the display screen, the electronic device controls the display screen to emit light to illuminate the surface of the user's finger. The light can be reflected by the user's finger into the fingerprint sensor below the display screen, and the fingerprint sensor can convert the reflected light into a digital image signal to obtain the user's fingerprint image.

However, in the current off-screen fingerprint sensing technology, the brightness and color of the light illuminating the surface of the user's finger from the display screen are usually fixed, so that the fingerprint sensor may feel The fingerprint image is not clear enough.

In view of this, the present invention provides a touch display module with a partial screen high-brightness mode and a display driver thereof, which can adjust at least one of the display brightness and display color of a specific pattern of a display screen in the partial screen high-brightness mode One.

The display driver created by the novel includes a gray-scale voltage generator and a driving circuit. The gray-scale voltage generator is used to generate a first gray-scale voltage set. The driving circuit is used to receive the display data and the mode signal, coupled to the gray-scale voltage generator to receive the first gray-scale voltage group, and convert the display data into a plurality of drive signals according to the first gray-scale voltage group to drive the touch display Panel display screen. The driving circuit adjusts at least one of the display brightness and the display color of the specific pattern of the picture in response to the mode signal.

In an embodiment of the invention, the driving circuit described above further detects a specific pattern whose display color is the first color in a specific area according to the display data, and changes the display color of the specific pattern from the first color to The second color, where the second color is different from the first color.

In an embodiment of the invention, the driving circuit described above further detects a specific pattern whose display color is the first color in a specific area according to the display data, and adjusts the display brightness of the specific pattern.

In an embodiment of the invention, the above-mentioned display driver further includes a pattern generating circuit. The pattern generating circuit is coupled to the driving circuit and used to provide pattern data to the driving circuit. The driving circuit further responds to the mode signal and uses the pattern data as part of the display data to drive the touch display panel to display the screen with the specific pattern.

In an embodiment of the invention, the shape of the specific pattern is a circle, a square, a star, or any shape.

In an embodiment of the invention, the above-mentioned driving circuit further adds the specific display data or the pattern data corresponding to the specific pattern in the display data with a preset value to change at least one of the display color and display brightness of the specific pattern .

In an embodiment of the invention, the gray-scale voltage generator described above further generates a second gray-scale voltage set. The driving circuit adjusts at least one of the display brightness and the display color of the specific pattern according to the second gray-scale voltage set.

In an embodiment of the invention, the driving circuit described above has a mode pin. The driver circuit receives the mode signal through this mode pin.

In an embodiment of the invention, the above-mentioned drive circuit has a dedicated communication interface, and the drive circuit receives the groove communication number or mode signal through the dedicated communication interface.

In an embodiment of the invention, the above-mentioned dedicated communication interface includes a serial peripheral interface, a built-in integrated circuit interface or a mobile industry processor interface.

In an embodiment of the invention, the above display driver further includes a touch sensing circuit. The touch sensing circuit is coupled to the driving circuit for sensing the touch on the touch display panel, and generates a mode signal to the driving circuit accordingly.

The touch display module created by the present invention includes the aforementioned touch display panel and the aforementioned display driver. The display driver is coupled to the touch control display panel.

Based on the above, the touch display module and the display driver proposed by the present invention can adjust at least one of the display brightness and display color of the specific pattern of the display screen in response to the mode signal to achieve high brightness of the local screen .

In order to make the above-mentioned features and advantages of the creation of the new model more obvious and understandable, the embodiments are specifically described below and described in detail in conjunction with the attached drawings.

Reference will now be made in detail to exemplary embodiments of the novel creation, and examples of the exemplary embodiments will be described in the drawings. In addition, wherever possible, elements / components that use the same reference numbers in the drawings and embodiments represent the same or similar parts.

FIG. 1 is a block diagram of a touch display module according to an embodiment of the present invention. Referring to FIG. 1, the touch display module 100 includes a touch display panel 120 and a display driver 140. In an embodiment of the novel creation, the touch display panel 120 may be, for example, an organic light-emitting diode (OLED) display panel integrated with a touch function, but the novel creation is not limited thereto. The creation of this new type does not limit the type of the touch display panel 120, which depends on the actual application or design requirements.

The display driver 140 is coupled to the touch control display panel 120 for driving the touch display panel 120. The display driver 140 includes a gray-scale voltage generator 142 and a driving circuit 144, but the invention is not limited to this. The gray-scale voltage generator 142 is used to generate a first gray-scale voltage group GVS1. The driving circuit 144 receives the display data DI and the mode signal MS. The driving circuit 144 is coupled to the grayscale voltage generator 142 to receive the first grayscale voltage group GVS1, and converts the display data DI into a plurality of drive signals DS according to the first grayscale voltage group GVS1 to drive the touch display panel 120 to display Screen. In particular, the driving circuit 144 can adjust at least one of the display brightness and the display color of the specific pattern in the above-mentioned picture in response to the mode signal MS, which will be described in detail later.

In an embodiment of the invention, the driving circuit 144 may include, for example, a shift register, a latch, a level shifter, and a digital-to-analog converter ( Digit to Analog Converter (DAC) and output buffer (Output Buffer) data line driving circuits are coupled to multiple data lines of the touch control display panel 120.

In an embodiment of the present invention, the mode signal MS may be provided by a touch sensor or other controller outside the display driver 140 to trigger the driving circuit 144 to adjust the display brightness of the specific pattern in the above picture and Display at least one of the colors to achieve a high brightness of the partial picture.

In an embodiment of the invention, the driving circuit 144 may have a dedicated mode pin. The driving circuit 144 may receive the mode signal MS through the mode pin, but the invention is not limited to this.

In an embodiment of the invention, the driving circuit 144 may have a dedicated communication interface (Serial Peripheral Interface (SPI), Inter-Integrated Circuit Interface (I ² C) ) Or Mobile Industry Processor Interface (MIPI), etc., or other communication methods sufficient to transmit the slot communication number, wherein the drive circuit 144 can receive the slot communication number or mode signal through this communication interface to adjust the At least one of the display brightness and the display color of the specific pattern is used to achieve a high brightness of the partial picture, but the creation of the present invention is not limited to this.

In an embodiment of the present invention, the mode signal MS may be, for example, an instruction from another controller or processor to instruct the driving circuit 144 to adjust at least one of the display brightness and the display color of the specific pattern in the above picture.

In an embodiment of the invention, the display driver 140 may further include a scanning line driving circuit (not shown), which is coupled to the multiple scanning lines of the touch control display panel 120.

2 is a block diagram of a touch display module according to another embodiment of the present invention. Referring to FIG. 2, the touch display module 100 'includes a touch display panel 120 and a display driver 140'. The touch display panel 120 of FIG. 2 is similar to the touch display panel 120 of FIG. 1, so reference may be made to the related description of FIG. 1 described above, and details are not repeated here. The display driver 140 'is coupled to the touch control display panel 120. The display driver 140 'of FIG. 2 is similar to the display driver 140 of FIG. 1, except that the display driver 140' of FIG. 2 further includes a touch sensing circuit 246 and a pattern generating circuit 248. Regarding the gray-scale voltage generator 142 and the driving circuit 144 of FIG. 2, reference may be made to the related description of FIG. 1 described above, which will not be repeated here.

The touch sensing circuit 246 is coupled to the driving circuit 144 and the touch display panel 120 for sensing the touch on the touch display panel 120 and generating a mode signal MS to the driving circuit 144 accordingly. The pattern generating circuit 248 is coupled to the driving circuit 144 for providing pattern data PI to the driving circuit 144. In an embodiment of the invention, the touch sensing circuit 246 can be implemented using existing touch sensors, and the pattern generating circuit 248 can be implemented using existing pattern generating circuits.

In an embodiment of the invention, the gray-scale voltage generator 142 further generates the second gray-scale voltage group GVS2. The driving circuit 144 may adjust at least one of the display brightness and the display color of the specific pattern 124 according to the second gray-scale voltage group GVS2.

In the above embodiment, the gray-scale voltage generator 142 may include a first gray-scale voltage generation circuit and a second gray-scale voltage generation circuit, which are respectively used to generate a first gray-scale voltage group GVS1 and a second gray-scale voltage group GVS2 . Since the display brightness and display color of the specific pattern 124 are independently adjusted by the second gray-scale voltage group GVS2 generated by the second gray-scale voltage generation circuit, the display brightness and display color of the areas other than the specific pattern 124 are based on Generated by the first gray-scale voltage group GVS1 of the first gray-scale voltage generation circuit, in this way, it is possible to avoid adjusting the display brightness and display color of the specific pattern 124 to affect the display brightness and display of other areas than the specific pattern 124 colour.

In the above embodiment, the second gray-scale voltage group GVS2 may be, for example, a fixed gray-scale voltage, and the driving circuit 144 may allow the specific pattern 124 to exhibit a specific brightness or a specific color according to the fixed gray-scale voltage. Creation is not limited to this.

In the above embodiment, the second gray-scale voltage group GVS2 may, for example, provide a gray-scale voltage with a higher voltage value and a wider voltage range, and the driving circuit 144 may provide a gray-scale voltage with a higher voltage value and a wider voltage range. The voltage makes the specific pattern 124 present a locally high-brightness display, but the creation of the present invention is not limited to this.

In the above embodiments, the first gray-scale voltage generating circuit and the second gray-scale voltage generating circuit can be implemented by using the existing gray-scale voltage generating circuit, but it is not limited thereto.

The following will take the touch display module 100 'of FIG. 2 applied to a mobile communication device as an example to illustrate the operation of the touch display module 100', but the application of the touch display module created by the present invention is not limited to this The touch display module created by the novel can be applied to various types of electronic devices.

FIG. 3 is a schematic diagram of a touch display module created according to the present invention applied to a display screen of a mobile communication device. Please refer to FIG. 2 and FIG. 3 together. It is assumed that the mobile communication device operates in the power saving mode, so the mobile communication device provides the display data DI associated with the power saving mode to the driving circuit 144, so that the driving circuit 144 according to the display data DI Generate a driving signal DS to drive the touch display panel 120 to display the information display screen PF1 shown in the left diagram of FIG. 3, such as the AOD mode (Always On Display, AOD) screen, or other power saving mode screens, but This new creation is not limited to this.

In an embodiment of the present invention, when the touch sensing circuit 246 senses that the user touches the touch display panel 120, the touch sensing circuit 246 can generate a mode signal MS to the driving circuit 144 and the mobile communication device. The mobile communication device can provide the display data DI associated with the specific pattern 124 to the driving circuit 144, so that the driving circuit 144 generates a driving signal DS according to the display data DI to drive the touch display panel 120 to the specific area 122 of the display screen PF1 A specific pattern 124 is displayed inside, such as a star pattern shown in the middle drawing of FIG. 3, but it is not limited thereto. In particular, the fingerprint sensor of the mobile communication device is, for example, disposed below the display area of the specific pattern 124, so the user can place his finger on the display area of the specific pattern 124, so that the light of the display area of the specific pattern 124 The surface of the user's finger is illuminated and reflected into the fingerprint sensor, so that the fingerprint sensor obtains the fingerprint image of the user. It can be understood that the specific area 122 (or the display area of the specific pattern 124) can be set according to the actual arrangement position of the fingerprint sensor.

In addition, the color of the specific pattern 124 provided by the mobile communication device may be the first color (for example, red, but not limited thereto), that is, the display color of the display area of the specific pattern 124 is the first color. However, under certain usage environments, the fingerprint image sensed by the fingerprint sensor of the mobile communication device by the light of the display area of the specific pattern 124 (the light of the first color) may not be clear enough or have low recognition. Therefore, in an embodiment of the invention, the driving circuit 144 can detect the specific pattern 124 whose display color is the above-mentioned first color in the specific area 122 according to the display data DI provided by the mobile communication device, and The display color of the display area of the pattern 124 is changed from the first color to the second color (for example, white or any color, but not limited to this), as shown in the right diagram of FIG. 3 to improve the fingerprint obtained by the fingerprint sensor The clarity or recognizability of the image, where the second color is different from the first color. In another embodiment of the invention, the driving circuit 144 can increase the display brightness of the display area of the specific pattern 124 to improve the clarity or recognizability of the fingerprint image obtained by the fingerprint sensor. In another embodiment of the invention, the driving circuit 144 can change the display color of the display area of the specific pattern 124 from the first color to the second color, and at the same time increase the display brightness of the display area of the specific pattern 124.

In another embodiment of the invention, when the touch sensing circuit 246 senses that the user touches the touch display panel 120, the touch sensing circuit 246 can generate a mode signal MS to the driving circuit 144. In response to the mode signal MS, the driving circuit 144 uses the pattern data PI provided by the pattern generating circuit 248 as a part of the display data DI, and converts the display data DI into a driving signal DS to drive the touch display panel 120 to display The screen PF1 displays a specific pattern 124, such as a star pattern shown in the middle diagram of FIG. 3, but the creation of the novel is not limited to this. In other embodiments of the present invention, the shape of the specific pattern 124 may also be a circle, a square, or any shape, depending on the actual application or design requirements. Similarly, the driving circuit 144 may change at least one of the display color and display brightness of the specific pattern 124 according to actual applications.

In an embodiment of the invention, the pattern generating circuit 248 may have a register, which may store the setting value for generating the pattern data PI. For example, if the specific pattern 124 is a circular pattern, the register stores the coordinate point and radius value of the center of the circular pattern on the display screen PF1; if the specific pattern 124 is a square pattern, the register stores this The four points of the square pattern are on the coordinate points on the display screen PF1, and the specific pattern 124 of any shape can also be deduced by analogy.

In an embodiment of the invention, the driving circuit 144 may add a predetermined value to the specific display data (or pattern data PI) corresponding to the specific pattern 124 in the display data DI to achieve the display of changing the specific pattern 124 The purpose of at least one of color and display brightness.

FIG. 4 is a schematic diagram of another display screen of a touch display module created according to the present invention applied to a mobile communication device. Please refer to FIG. 2 and FIG. 4, assuming that the mobile communication device operates in the normal mode, so the mobile communication device provides the display data DI associated with the normal mode to the driving circuit 144, so that the driving circuit 144 generates a drive according to the display data DI The signal DS is used to drive the touch display panel 120 to display the desktop display screen PF2 shown in the left diagram of FIG. 4.

In an embodiment of the present invention, when the touch sensing circuit 246 senses that the user touches the touch display panel 120, the touch sensing circuit 246 can generate a mode signal MS to the driving circuit 144 and the mobile communication device. The mobile communication device can provide the display data DI associated with the specific pattern 124 to the driving circuit 144, so that the driving circuit 144 generates a driving signal DS according to the display data DI to drive the touch display panel 120 to display specific information in the specific area 122 of the display screen PF2 The pattern 124 is an oval pattern as shown in the middle drawing of FIG. 4.

In another embodiment of the invention, when the touch sensing circuit 246 senses that the user touches the touch display panel 120, the touch sensing circuit 246 can generate a mode signal MS to the driving circuit 144. In response to the mode signal MS, the driving circuit 144 uses the pattern data PI provided by the pattern generating circuit 248 as a part of the display data DI, and converts the display data DI into a driving signal DS to drive the touch display panel 120 to display A specific pattern 124 is displayed on the screen PF2, such as an oval pattern shown in the middle diagram of FIG. 4.

Similarly, the driving circuit 144 can change at least one of the display color and the display brightness of the specific pattern 124 of FIG. 4 according to the actual application. As shown in the right diagram of FIG. 4, the detailed operation can be referred to the related description of FIG. 3 above. I will not repeat them here.

In summary, the touch display module and the display driver proposed in the present invention can adjust at least one of the display brightness and the display color of the specific pattern of the display screen in response to the mode signal to realize the partial screen high brightness.

Although the new creation has been disclosed as above with examples, it is not intended to limit the creation of the new creation. Anyone with ordinary knowledge in the technical field of the subject can make some changes and without departing from the spirit and scope of the new creation. Retouch, so the scope of protection of this new creation shall be subject to the scope defined in the appended patent application.

100, 100'‧‧‧ touch display module
120‧‧‧Touch display panel
122‧‧‧Specified area
124‧‧‧Special pattern
140, 140'‧‧‧ display driver
142‧‧‧ gray scale voltage generator
144‧‧‧ drive circuit
246‧‧‧Touch sensing circuit
248‧‧‧pattern generating circuit
DI‧‧‧Display data
DS‧‧‧Drive signal
GVS1‧‧‧The first gray scale voltage group
GVS2‧‧‧second gray scale voltage group
MS‧‧‧mode signal
PF1, PF2‧‧‧Display screen
PI‧‧‧pattern information

FIG. 1 is a block diagram of a touch display module according to an embodiment of the present invention. 2 is a block diagram of a touch display module according to another embodiment of the present invention. FIG. 3 is a schematic diagram of a touch display module created according to the present invention applied to a display screen of a mobile communication device. FIG. 4 is a schematic diagram of another display screen of a touch display module created according to the present invention applied to a mobile communication device.

Claims (12)

A display driver includes: a gray-scale voltage generator for generating a first gray-scale voltage group; and a drive circuit for receiving a display data and a mode signal, coupled to the gray-scale voltage generator to receive The first gray-scale voltage group, and converting the display data into a plurality of driving signals according to the first gray-scale voltage group to drive a touch display panel to display a picture, wherein the driving circuit is adjusted in response to the mode signal At least one of a display brightness and a display color of a specific pattern of the picture. The display driver according to item 1 of the patent application scope, wherein the drive circuit further detects the specific pattern whose display color is a first color in a specific area according to the display data, and compares the specific pattern with the specific pattern The display color is changed from the first color to a second color, where the second color is different from the first color. The display driver as described in item 1 of the patent application scope, wherein the drive circuit further detects the specific pattern whose display color is a first color in a specific area according to the display data, and adjusts the specific pattern's The display brightness. The display driver as described in item 1 of the patent application scope further includes: a pattern generating circuit coupled to the driving circuit for providing a pattern data to the driving circuit, wherein the driving circuit further responds to the mode signal The pattern data is used as part of the display data to drive the touch display panel to display the screen with the specific pattern. The display driver as described in item 4 of the patent application, wherein a shape of the specific pattern is a circle, a square, a star, or any shape. The display driver as described in item 4 of the patent application scope, wherein the driving circuit further adds a preset value to a specific display data corresponding to the specific pattern in the display data to change the specific pattern At least one of the display color and the display brightness. The display driver according to item 1 of the patent application scope, wherein the gray-scale voltage generator further generates a second gray-scale voltage set, wherein the drive circuit adjusts the display brightness of the specific pattern according to the second gray-scale voltage set And at least one of the display colors. The display driver according to item 1 of the patent application scope, wherein the driving circuit has a mode pin, and the driving circuit receives the mode signal through the mode pin. The display driver according to item 1 of the patent application scope, wherein the drive circuit has a dedicated communication interface, and the drive circuit receives a channel communication number or the mode signal through the dedicated communication interface. The display driver as described in item 9 of the patent application scope, wherein the dedicated communication interface includes a serial peripheral interface, a built-in integrated circuit interface or a mobile industry processor interface. The display driver as described in item 1 of the patent application scope further includes: a touch sensing circuit coupled to the driving circuit for sensing the touch on the touch display panel and generating the mode signal accordingly To the drive circuit. A touch display module includes: a touch display panel; and a display driver coupled to the touch display panel, wherein the display driver includes: a gray scale voltage generator for generating a first gray scale voltage Group; and a driving circuit for receiving a display data and a mode signal, coupled to the grayscale voltage generator to receive the first grayscale voltage group, and convert the display data according to the first grayscale voltage group It is a plurality of driving signals to drive the touch display panel to display a picture, wherein the driving circuit adjusts at least one of a display brightness and a display color of a specific pattern of the picture in response to the mode signal.