TWI777386B - Display driver chip and display and information processing device using the same - Google Patents

Abstract

A display driving chip has a pixel value adjustment module for mapping an input pixel value to an output pixel value according to an ambient light intensity, characterized in that the pixel value adjustment module has: a plurality of memory units for storing multiple memory units. a group of pixel value adjustment difference values; a selection unit for selecting a group of adjustment difference values in the plurality of groups of pixel value adjustment difference values according to the ambient light intensity, and a mapping unit for including the input pixel in a plurality of pixel value ranges mapping a range of values to a subgroup corresponding to one of the set of adjusted differences, and mapping the input pixel value to one of the adjusted differences in the corresponding subgroup to generate an output difference; and an addition The unit generates the output pixel value according to the sum of the input pixel value and the output difference value.

Description

Display driver chip and display and information processing device using the same

The present invention relates to a display driving chip, in particular to a display driving chip which can adjust display brightness according to ambient light.

In order to allow users to clearly see the screen displayed on the display under strong light, the general practice is to choose low-reflective materials and set an intellectual property (IP; intellectual property) module in the display driver chip to follow the background light. Strong and Weak Adjust the brightness of the display light source.

SLR (sun light readable) algorithm module is a common intellectual property right (IP; intellectual property) module in display driver chips. It is a kind of dynamic adjustment of the low gray level of the displayed picture according to the ambient light intensity and weakness obtained by the sensor. The algorithm of the brightness of the step area is used to adapt to the viewing characteristics of the human eye in different environments to improve the user's viewing experience.

The SLR algorithm uses different fitting curves to correspond to different ambient lights. For example, three curves are set for high, medium, and low ambient lights, so as to correct the value of the input pixel data. In addition, when correcting the value of the input pixel data with a corresponding fitting curve, the most commonly used fitting method is piecewise linear fitting. For example, the commonly used implementation method is to design 16 binding points for each curve. When calculating the output pixel data, first determine the gray-scale area where the input pixel data is located, and then use the two boundary binding points of the gray-scale area to the input pixel. The data are linearly fitted to generate output pixel data.

However, the linear fitting process involves the computation of multiplication and division. For example, assuming that the two bounding points of the original linear fitting region are (B ₁ , K ₁ ) and (B ₂ , K ₂ ), respectively, Then the value Y _OUT of the output pixel data corresponding to the value Y _IN of the input pixel data can be expressed as:

Y _OUT = B ₁ +(Y _IN -B ₁ )*(K ₂ -K ₁ )/(B ₂ -B ₁ ). That is, the linear fitting process consumes a large amount of circuit resources and power consumption for the display driver chip due to the computation involving multiplication and division.

Therefore, there is an urgent need in the art for a display driver chip with a novel SLR algorithm module.

An object of the present invention is to provide a display driver chip, which can accelerate the mapping process of input display data to output display data by using an SLR algorithm module of addition operation.

Another object of the present invention is to provide a display driver chip, which can reduce the circuit area by using an SLR algorithm module of addition operation.

Another object of the present invention is to provide a display driving chip, which can reduce the power consumption of the chip by adopting an SLR algorithm module of addition operation.

In order to achieve the aforementioned purpose, a display driver chip is proposed, which is used to map an input pixel value to an output pixel value according to an ambient light intensity, and is characterized in that the pixel value adjustment module has: a plurality of sets of memory a unit for storing a plurality of groups of pixel value adjustment differences; a selection unit for selecting a group of adjustment differences among the plurality of groups of pixel value adjustment differences according to the ambient light intensity, the group of adjustment differences includes a plurality of subgroups, and each Each of the subgroups includes at least one of the adjusted difference values; and a mapping unit for mapping a range of a plurality of pixel value ranges including the input pixel value to a corresponding subgroup, and to map the input pixel value mapping the adjusted difference to one of the corresponding subgroups to generate an output difference; and an adding unit to generate the output pixel according to the sum of the input pixel value and the output difference.

In one embodiment, the selection unit is a multiplexer.

In one embodiment, the selection unit is a look-up table.

In one embodiment, the size of the range of pixel values with higher pixel values is larger than the size of the range of pixel values with lower pixel values.

In one embodiment, the adjusted difference value corresponding to a range of pixel values with higher pixel values is lower than the adjusted difference value corresponding to a range of pixel values with lower pixel values.

In one embodiment, one of the subgroups has two of the adjustment differences, one is the main adjustment difference, the other is the boundary adjustment difference, and the boundary adjustment difference is the main adjustment difference and a A weighted average of the main adjusted differences of adjacent said subgroups.

In one embodiment, one of the subgroups has three of the adjusted differences, one of which is the primary adjustment difference, the other two are boundary adjustment differences, and among the two boundary adjustment differences, one is the main adjustment difference and one of the main adjustment differences of an adjacent subgroup a weighted average, and the other is a weighted average of the main adjusted difference and the main adjusted difference of another adjacent subgroup.

In one embodiment, the addition unit has an upper limit clamp function to prevent the output pixel value from overflowing its maximum boundary.

In order to achieve the aforementioned object, the present invention further provides a display having a pixel array and the aforementioned display driving chip for driving the pixel array.

In a possible embodiment, the pixel array can be a liquid crystal pixel array, an LED pixel array, a micro-LED pixel array, a quantum dot LED pixel array, or an organic light emitting diode pixel array. Polar body pixel array.

In order to achieve the aforementioned purpose, the present invention further provides an information processing device, which has a central processing unit and the aforementioned display, wherein the central processing unit is used for communication with the display, and in a possible embodiment, the information The processing device can be a portable computer, a smart handheld device, an LED advertising billboard or an LCD advertising billboard.

100: Monitor

110: Display driver chip

111: Pixel value adjustment module

111a: Memory Unit

111b: Select unit

111c: Mapping Unit

111d: Addition unit

112: Drive unit

120: pixel array

200: Information processing device

210: Central Processing Unit

220: Display

In order to further disclose the specific technical content of the present invention, please refer to the drawings first, wherein: FIG. 1 is a block diagram showing an embodiment of a display including a display driver chip of the present invention.

FIG. 2a is a diagram illustrating a correspondence between n subgroups of output difference values S _delt and one of n pixel value ranges of input pixel values S _PIXIN .

FIG. 2b shows another correspondence diagram of n subgroups of output difference values S _delt and n pixel value ranges of input pixel values S _PIXIN .

FIG. 3 is a block diagram illustrating an embodiment of the information processing apparatus of the present invention.

Please refer to FIG. 1, which shows a block diagram of an embodiment of a display including the display driver chip of the present invention. As shown in FIG. 1, a display 100 includes a display driver chip 110 and a pixel array 120, wherein the display driver chip 110 has a pixel value adjustment module 111 and a driving unit 112, and the pixel value adjustment module 111 is used for An input pixel value S _PIXIN is mapped to an output pixel value S _PIXO according to an ambient light intensity S _AMBL , and the driving unit 112 is used for generating a pixel driving voltage VP according to the output pixel value _{S PIXO} to drive the pixel array 120 to display a picture, And the pixel value adjustment module 111 includes a plurality of memory units 111a, a selection unit 111b, a mapping unit 111c and an addition unit 111d. In addition, the pixel array 120 can be a liquid crystal pixel array, a light emitting diode pixel array, a micro light emitting diode pixel array, a quantum dot light emitting diode pixel array or an organic light emitting diode pixel array.

The multiple sets of memory units 111a are used for storing multiple sets of pixel value adjustment differences, wherein each set of pixel value adjustment differences corresponds to a different ambient light intensity S _AMBL .

The selection unit 111b, which can be a multiplexer or a look-up table, is used for selecting a set of adjustment differences among the plurality of sets of pixel value adjustment differences according to the ambient light intensity S _AMBL , and the set of adjustment differences includes a plurality of adjustment differences. subgroups, each of which includes at least one of the adjusted differences.

The mapping unit 111c is used for mapping a range of a plurality of pixel value ranges including the input pixel value _SPIXIN to a corresponding subgroup, and mapping the input pixel value _SPIXIN to the corresponding subgroup One of the adjustment difference values is described to generate an output difference value S _delt .

Please refer to FIG. 2a, which shows n subgroups {(d ₁ ), (d ₂ ), . . . (d _n )} of output difference values _{S delt} and n pixel value ranges {R ₁ , One of R ₂ ,...R _n } corresponds to a graph, where n is a positive integer greater than 1, where the left boundary of R _i is equal to the right boundary of R _i-1 plus 1, and i is an integer between 1 and n; and Each subgroup has an adjusted difference d _j , where j is an integer between 1 and n. Accordingly, when the input pixel value S _PIXIN bit is in the pixel value range R ₁ , it will be mapped to the adjustment difference value d ₁ ; when the input pixel value S _PIXIN bit is in the pixel value range R ₂ , it will be mapped to the adjustment difference value d ₂ ; and so on.

Please refer to FIG. 2b, which shows n subgroups of output difference values S _delt {(d ₁ ,d _1,2 ),(d _1,2 ,d ₂ ,d _2,3 ),...(d _{n-1, n} ,d _n )} and another corresponding graph of n pixel value ranges {R ₁ ,R ₂ ,...R _n } of the input pixel value S _PIXIN , where the left boundary of R _i is equal to the right boundary of R _i-1 Add 1, i is an integer between 1 and n; and each subgroup has two or three adjustment differences, where d _i is the main adjustment difference, i is an integer between 1 and n, and d _j-1,j is the boundary adjustment difference, and _{dj-1,j is} the weighted average of _dj-1 and dj, and j is an integer between 2 and n. Accordingly, when the input pixel value S _PIXIN bit is within the pixel value range R ₁ but not on the boundary, it will be mapped to the adjustment difference d ₁ , when the input pixel value S _PIXIN bit is on the right boundary of the pixel value range R ₁ , it will be mapped to the adjusted difference d _1,2 ; when the input pixel value _SPIXIN bit is within the pixel value range R ₂ but not on the boundary, it will be mapped to the adjusted difference d ₂ , when the input pixel value _SPIXIN When the bit is on the left boundary of the pixel value range R ₂ , it will be mapped to the adjustment difference value d _1,2 , and when the input pixel value _SPIXIN bit is on the right boundary of the pixel value range R ₂ , it will be mapped to the adjustment difference value d 1,2 The value d _2,3 ; and so on.

In addition, it is preferable to make the pixel value range R _j with higher pixel value have a larger range, and make the pixel value range R _j-1 with lower pixel value have a smaller range to adapt to the viewing characteristics of human eyes , j is an integer between 2 and n.

In addition, preferably, the main adjustment difference value dj corresponding to the pixel value range _Rj with higher pixel value can be made lower than the adjustment difference value _dj- corresponding to the pixel value range _{Rj -1} with lower pixel value ₁ to suit the viewing characteristics of the human eye, and j is an integer between 2 and n.

The adding unit 111d is used for generating the output pixel value S _PIXO according to the sum of the input pixel value S _PIXIN and the output difference value S _delt . In addition, the adding unit 111d may further have an upper limit clamping function to prevent the output pixel value _SPIXO from overflowing its maximum boundary.

According to the above description, the present invention further provides an information processing device. Please refer to FIG. 3 , which shows a block diagram of an embodiment of the information processing apparatus of the present invention. As shown in FIG. 3 , an information processing apparatus 200 has a central processing unit 210 and a display 220 , wherein the central processing unit 210 is used for communicating with the display 220 and the display 220 is realized by the display 100 . In addition, the information processing device 200 may be a portable computer, a smart handheld device, an LED (light emitting diode) advertising sign or an LCD (liquid crystal display) advertising sign.

According to the above description, the present invention can provide the following advantages:

1. The display driver chip of the present invention can accelerate the mapping process of input display data to output display data by using an SLR algorithm module of addition operation.

2. The display driver chip of the present invention can reduce the circuit area by using an SLR algorithm module of addition operation.

3. The display driver chip of the present invention can use an SLR algorithm of addition operation The module reduces the power consumption of the chip.

What is disclosed in the present invention is one of the preferred embodiments, and any partial changes or modifications originating from the technical idea of the present invention and easily inferred by those skilled in the art are within the scope of the patent right of the present invention.

To sum up, regardless of the purpose, means and effect of this case, it shows that it is completely different from the conventional technology, and its first invention is suitable for practical use, and indeed meets the patent requirements of the invention. Society is to pray for the best.

100: Display 110: Display driver chip 111: Pixel value adjustment module 111a: Memory Unit 111b: Select unit 111c: Mapping Unit 111d: Addition Unit 112: Drive unit 120: pixel array

Claims (11)

A display driving chip has a pixel value adjustment module for mapping an input pixel value to an output pixel value according to an ambient light intensity, characterized in that the pixel value adjustment module has: a plurality of memory units for storing a plurality of groups of pixel value adjustment differences; a selection unit to select a group of adjustment differences among the plurality of groups of pixel value adjustment differences according to the ambient light intensity, the group of adjustment differences includes a plurality of subgroups, and each of the subgroups Each of the groups includes at least one of the adjusted difference values; and a mapping unit for mapping a range of a plurality of pixel value ranges including the input pixel value to a corresponding subgroup, and mapping the input pixel value to the input pixel value A corresponding one of the subgroups said adjusted difference to generate an output difference; and an adding unit to generate the output pixel value according to the sum of the input pixel value and the output difference. The display driving chip as described in claim 1, wherein the selection unit is a multiplexer. The display driving chip of claim 1, wherein the selection unit is a look-up table. The display driving chip of claim 1, wherein the size of the pixel value range with higher pixel values is larger than the size of the pixel value range with lower pixel values. The display driving chip of claim 1, wherein a said adjustment difference value corresponding to a pixel value range with a higher pixel value is lower than a pixel value range with a lower pixel value corresponding to the adjustment difference. The display driving chip as described in claim 1, wherein one of the subgroups has two adjustment differences, one is a main adjustment difference, the other is a boundary adjustment difference, and the boundary adjustment The difference is a weighted average of the main adjusted difference and the main adjusted difference of an adjacent subgroup. The display driving chip as described in claim 1, wherein one of the subgroups has three adjustment differences, one of which is the main adjustment difference, the other two are boundary adjustment differences, and the two are Among the boundary adjustment differences, one is the difference between the main adjustment difference and an adjacent subgroup. A weighted average of the main adjustment difference, and the other is a weighted average of the main adjustment difference and the main adjustment difference of another adjacent subgroup. The display driving chip as described in claim 1, wherein the adding unit has an upper limit clamping function to prevent the output pixel value from overflowing its maximum limit. A display has a pixel array and the display driving chip described in any one of the claims 1 to 8 for driving the pixel array. The display of claim 9, wherein the pixel array is composed of a liquid crystal pixel array, a light-emitting diode pixel array, a micro-light-emitting diode pixel array, a quantum dot light-emitting diode pixel array, and an organic light-emitting diode array A pixel array selected from the group formed by the volume pixel array. An information processing device, which has a central processing unit and a display as described in item 9 of the patent application scope, wherein the central processing unit is used for communication with the display, and the information processing device is composed of a portable computer, An information processing device selected by a group consisting of an intelligent handheld device, an LED advertising billboard and an LCD advertising billboard.

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