KR-20260065487-A - DISPLAY CONTROL METHOD AND APPARATUS FOR LOW POWER OPERATION

KR20260065487AKR 20260065487 AKR20260065487 AKR 20260065487AKR-20260065487-A

Abstract

A partial display control method and apparatus for low-power driving are disclosed. The display control apparatus may include a pixel array in which pixels are arranged and which includes a pixel embedded memory, a scan controller that outputs a sequential line activation signal for each line of the pixel array, and a shift register controller that logically generates a flag bit indicating whether pixel data of each pixel included in the line activated by the line activation signal is updated.

Inventors

정대영
김은별

Assignees

주식회사 사피엔반도체

Dates

Publication Date: 20260508
Application Date: 20250723
Priority Date: 20241030

Claims (12)

A pixel array in which pixels are arranged, including pixel embedded memory; A scan controller that outputs sequential line activation signals for each line of the pixel array; and It includes a shift register controller that logically generates a flag bit indicating whether the pixel data of each pixel included in the line activated by the line activation signal is updated, Each pixel included in the above-mentioned activated line is characterized by selectively performing an update of pixel data stored in the pixel internal memory based on the activation signal and the logical value of the flag bit. Display driving device.
In paragraph 1, Each of the above pixels further includes a pixel update control logic that outputs a pixel update control signal by performing a logical AND operation of the line activation signal and the flag bit, and The pixel embedded memory included in each of the above pixels performs maintenance or updating of pixel data based on the pixel update control signal. Display driving device.
In paragraph 1, The shift register controller receives a timing signal reflecting the display pixel information to be updated, and logically generates the flag bit based on the timing signal. Display driving device.
In paragraph 3, The above-mentioned update target display pixel information includes any one of information regarding a preset zone of the display panel, information set for each line of the display panel, and information set for individual pixels of the display panel. Display driving device.
In paragraph 1, The shift register controller transmits pixel data and the flag bit for each column of the pixel array. Display driving device.
In paragraph 1, The pixel embedded memory above stores only pixel data for display and does not include a separate storage area for the flag bit. Display driving device.
In paragraph 1, If the above flag bit is a first logical value, the pixel embedded memory of the corresponding pixel is updated with new pixel data, and If the above flag bit is a second logical value, the pixel embedded memory of the corresponding pixel retains the previously stored pixel data. Display driving device.
Pixel built-in memory for storing pixel data; and It includes pixel update control logic that outputs a pixel update control signal by performing a logical AND operation on a line enable signal input from a scan controller and a flag bit input from a shift register controller, and The above flag bit indicates whether the pixel data of the above pixel is updated, and The pixel embedded memory is characterized by selectively performing maintenance or updating of pixel data based on the pixel update control signal. Pixels of a display device.
A driving method for a display having a pixel array in which pixels are arranged and including a pixel embedded memory, A step in which a scan controller outputs sequential line activation signals for each line of the pixel array; A step in which a shift register controller logically generates a flag bit indicating whether the pixel data of each pixel included in the line activated by the line activation signal is updated; and Each pixel included in the above-mentioned activated line selectively performs an update of pixel data stored in the pixel internal memory based on the activation signal and the logical value of the flag bit. Display driving method.
In Paragraph 9, The step of optionally performing the update of the pixel data above is, A step in which each of the above pixels performs a logical AND operation of the line activation signal and the flag bit to generate a pixel update control signal; and A step of maintaining or updating pixel data of the pixel embedded memory based on the pixel update control signal. Display driving method.
In Paragraph 9, The step of logically generating the above flag bit is, The step of the above shift register controller receiving a timing signal reflecting update target display pixel information; and A step comprising logically generating the flag bit based on the above timing signal Display driving method.
In Paragraph 9, The step of optionally performing the update of the pixel data above is, Characterized by updating the pixel internal memory of the corresponding pixel with new pixel data when the above flag bit is a first logical value, and maintaining the pixel data previously stored in the pixel internal memory of the corresponding pixel when the above flag bit is a second logical value. Display driving method.

Description

Display control method and apparatus for low power operation The technical field relates to digital display systems, and for example, to a method and device for controlling to update only a part of the display screen in a display device that requires low-power driving, such as an AR (Augmented Reality) display device. Display devices can be applied to a wide range of fields, from small mobile devices to large outdoor displays. In particular, displays are being utilized in even more diverse fields, such as various devices in vehicles, AR (Augmented Reality), MX (Mixed Reality), and XR (Extended Reality) devices. Therefore, improvements in various characteristics such as various areas, various shapes, high resolution, process time, manufacturing costs, high reliability, and fast response speed are still required. In the case of display driving, power consumption may increase if control is exercised by newly recording, saving, and scanning the entire image frame when there is an image change only in a part of the screen area. For portable devices, driving circuit control considering the power consumption of the display device may be required, and a method for selectively controlling display pixels may be required depending on the application being displayed. For example, in the case of AR devices, low-power operation through partial display control may be required because applications displaying simple information such as text or indicators may be primarily used. FIG. 1 is a drawing for explaining the configuration of a display control device according to an embodiment of the present invention. FIG. 2 is a drawing for explaining another example of a display control device according to an embodiment of the present invention. FIGS. 3 and FIGS. 4 are drawings illustrating examples of how the present invention is applied in various applications. FIG. 5 shows a timing signal according to the prior art, and FIG. 6 shows a timing signal according to an embodiment of the present invention. FIGS. 7 and 8 are drawings for explaining a timing signal and a display control according to an embodiment of the present invention. FIG. 9 is a diagram illustrating the pixel operation of a display panel according to an embodiment of the present invention. FIG. 10 is a flowchart illustrating a display control method for low-power driving according to an embodiment of the present invention. FIG. 11 is a drawing for illustrating an example of a display control device according to another embodiment of the present invention. FIG. 12 is a diagram illustrating the internal configuration and operation of individual pixels in FIG. 11. FIGS. 13 to 15 are drawings for illustrating an example of a pixel-level partial update in FIG. 11. FIG. 16 is a diagram illustrating examples of line update control, pixel update control, and memory update control according to an embodiment of the present invention. FIG. 17 is a diagram illustrating an example of operation of a pixel embedded memory and a shift register controller according to an embodiment of the present invention. FIG. 18 is a diagram showing an example of a pixel driving circuit provided for each pixel according to an embodiment of the present invention. Structural or functional descriptions are provided merely for the purpose of illustrating embodiments according to the concept of the present invention, and embodiments according to the concept of the present invention may be implemented in various forms and are not limited to the embodiments described herein. Embodiments according to the concept of the present invention may be subject to various modifications and may take various forms; therefore, embodiments are illustrated in the drawings and described in detail in this specification. However, this is not intended to limit the embodiments according to the concept of the present invention to specific disclosed forms, and includes modifications, equivalents, or substitutions that fall within the spirit and scope of the present invention. Terms such as "first" or "second" may be used to describe various components, but said components should not be limited by said terms. For the sole purpose of distinguishing one component from another, for example, without departing from the scope of rights according to the concept of the present invention, the first component may be named the second component, and similarly, the second component may be named the first component. When it is stated that one component is "connected" or "connected" to another component, it should be understood that while it may be directly connected or connected to that other component, there may also be other components in between. Conversely, when it is stated that one component is "directly connected" or "directly connected" to another component, it should be understood that there are no other components in between. Expressions describing the relationships between components, such as "between," "exactly between," or "di