JP7768579B2 - Printing device and program - Google Patents

Description

The present invention relates to a printing device and a program.

Printing devices that perform display processing on a display unit are known (see, for example, Patent Document 1).

JP 2016-49696 A

When a processor performs both printing and display processing, it can take a long time to generate the display data, which can cause the display processing to be delayed, resulting in a distorted screen image on the display unit.

The present invention was developed in consideration of these issues, and aims to prevent screen distortion during printing in a printing device that performs display processing on a display unit.

A printing device according to a first aspect of the present invention has a display processing unit that displays a display image on a display unit, and a printing unit, and includes: a print processing unit that executes a print process that causes the print unit to print; an identification unit that identifies whether the state of the print processing unit is a printing state in which the print processing unit is executing the print process, or a standby state in which the print processing unit is not executing the print process; and a display data generation unit that generates display data with a color depth determined based on whether the state of the print processing unit identified by the identification unit is the printing state or the standby state, and the display processing unit displays the display image based on the display data generated by the display data generation unit on the display unit.

The display data generation unit may generate display data with a first color depth when the state of the print processing unit identified by the identification unit is the standby state, and may generate display data with a second color depth lower than the first color depth when the state identified by the identification unit is the printing state.

The display data generation unit may identify the number of pixels of the display unit, refer to color depth information stored in a memory unit that associates the number of pixels of the display unit with the color depth in the printing state and the standby state, and generate the display data with the color depth associated with the state of the print processing unit identified by the identification unit and the identified number of pixels of the display unit.

The display data generation unit may acquire, from the display unit, Extended Display Identification Data (EDID) including information indicating the number of pixels of the display unit, and identify the number of pixels of the display unit based on the acquired EDID.
The display data generation unit may set the determined color depth in a display controller that displays the display data on the display unit.

The display processing unit may add complementary data to the display data generated by the display data generation unit to generate display data of a predetermined bit width, and cause the display unit to display the display image based on the generated display data of the predetermined bit width.

The printing device has the print processing unit, the display data generation unit, and a microcontroller that functions as the display processing unit, and the display data generation unit may identify a first processing amount, which is the processing amount that the microcontroller can allocate to generating display data when the state of the print processing unit identified by the identification unit is the standby state, as well as the number of pixels of the display unit and the refresh rate of the display unit, and determine the color depth to be applied to the display data in the standby state based on the identified first processing amount, the number of pixels, and the refresh rate.

The printing device has the print processing unit, the display data generation unit, and a microcontroller that functions as the display processing unit, and the display data generation unit may identify a second processing amount, which is the processing amount that the microcontroller can allocate to generating display data when the state of the print processing unit identified by the identification unit is the printing state, as well as the number of pixels of the display unit and the refresh rate of the display unit, and determine the color depth to be applied to the display data in the printing state based on the identified second processing amount, the number of pixels, and the refresh rate.

A program according to a second aspect of the present invention causes a printing device having a display processing unit that displays a display image on a display unit and a printing unit to function as a printing processing unit that executes a print process that causes the printing unit to print, a determination unit that determines whether the state of the print processing unit is in a printing state in which the print processing unit is executing the print process or a standby state in which the print processing unit is not executing the print process, a display data generation unit that generates display data with a color depth determined based on whether the state of the print processing unit is in the printing state or the standby state, and the display processing unit that displays a display image based on the display data generated by the display data generation unit on the display unit.

This invention has the advantage that, in a printing device that performs display processing on a display unit, it is possible to prevent the screen from becoming distorted during printing.

FIG. 1 is a diagram illustrating an overview of a printing device. FIG. 1 illustrates a configuration of a printing apparatus. FIG. 2 is a diagram illustrating a configuration of a control unit. 10A and 10B are diagrams illustrating a method for converting display data in RGB888 format into display data in RGB565 format. 10A and 10B are diagrams illustrating a method for converting display data in RGB565 format into display data in RGB888 format. 10 is a flowchart showing a process flow in which the printing device causes the display device to display a display image based on display data.

[Outline of Printing Device 1]
Fig. 1 is a diagram showing an overview of a printing device 1. As shown in Fig. 1, the printing device 1 is, for example, a thermal printer or barcode printer that prints on thermal paper, and is connected to a host PC 2 that controls its own printing and a display device 3 that serves as a display unit. The printing device 1 has a print processing unit that prints product labels, receipts, etc. in accordance with the control of the host PC 2. The printing device 1 also has a data generation unit that generates display data to display a display image on the display device 3 in response to receiving operation input from a user.

The printing device 1 determines whether the state of the print processing unit is a printing state in which printing processing is being performed, or a standby state in which printing processing is not being performed. When the data generation unit generates display data, the printing device 1 generates display data with a color depth determined based on whether the state of the print processing unit is a printing state or a standby state.

Conventionally, when a printing device has low processing power, if both the printing process and the display data generation process are performed simultaneously, the display process may not be able to keep up due to the time it takes to generate the display data, resulting in a distorted screen image on the display device. In response to this, the printing device 1 generates display data with a color depth determined based on whether the print processing unit is in a printing state or a standby state, allowing the color depth of the display data in the printing state to be lower than the color depth of the display data in the standby state. This allows the printing device 1 to quickly generate display data even when the print processing unit is in a printing state, preventing the screen from becoming distorted during printing.

[Configuration of Printing Device 1]
Fig. 2 is a schematic diagram of the configuration of the printing device 1. As shown in Fig. 2, the printing device 1 has a bus line 10, a device I/F (interface) 11, a host I/F 12, a display I/F 13, a bridge IC 14, a network I/F 15, a printing unit 16, a storage unit 17, and a control unit 18.

The device I/F 11, host I/F 12, display I/F 13, network I/F 15, printing unit 16, memory unit 17, and control unit 18 are connected via bus line 10. Bus line 10 includes a data bus, a control bus, and an address bus.

The device I/F 11 is, for example, a USB (Universal Serial Bus) device interface, and is an interface for connecting the printing device 1 to a host PC 2, which is a device capable of controlling printing by the printing device 1.

The host I/F 12 is, for example, a USB host interface, and is an interface for connecting devices controllable by the printing device 1 to the printing device 1. In this embodiment, the display device 3 is provided with a touch panel that accepts input operations, and the display device 3 is connected to the host I/F 12. In addition to the display device 3, the host I/F 12 is also connected to devices controllable by the printing device 1, including an input device 4 such as a keyboard, a barcode reader 5, and a storage device 6 such as a USB memory that stores display screen data (e.g., templates) for generating display data. Here, the display screen data is assumed to be data corresponding to the first color depth.

The display I/F 13 is, for example, an interface for displaying display data on the display device 3. A bridge IC 14 is connected to the display I/F 13. The bridge IC 14 functions as a display controller, converting DSI (Display Serial Interface) signals received from the control unit 18 into differential serial signals compatible with digital display standards such as the DisplayPort interface or HDMI (High-Definition Multimedia Interface) (registered trademark), and outputting the signals to the display device 3.

The network I/F 15 is, for example, a wired LAN interface. The network I/F 15 communicates with the external server 7, obtaining, for example, templates, which are display screen data to be displayed on the display device 3, from the server, and transferring information required to realize POS (Point of Sale) functions on the server 7 side. Information required to realize POS functions is, for example, information required to perform at least one of product information management, sales information management, and inventory information management.

In another example, server 7 may be a server responsible for logistics management, or a server at a medical institution that accepts patient inquiries and manages their electronic medical records, etc.

The printing unit 16 includes, for example, a thermal head that prints on thermal paper, a motor for transporting the thermal paper, a cutter motor that powers a cutter that cuts the thermal paper, and a sensor that detects the presence or absence of thermal paper, and prints on the thermal paper under the control of the host PC 2 or the control unit 18.

The storage unit 17 is a storage medium including a ROM (Read Only Memory), a RAM (Random Access Memory), a hard disk, etc. The storage unit 17 stores programs executed by the control unit 18. The storage unit 17 is provided with a frame buffer, which is a storage area that temporarily stores display data generated by the control unit 18.

The control unit 18 is a microcontroller including a processor such as a CPU (Central Processing Unit). Figure 3 is a diagram explaining the functions of the control unit 18. By executing the programs stored in the storage unit 17, the control unit 18 functions as a print processing unit 181, an identification unit 182, a display data generation unit 183, and a display processing unit 184, as shown in Figure 3.

The print processing unit 181 executes print processing that causes the printing unit 16 to print. For example, when the print processing unit 181 receives print data from the host PC 2 via the device I/F 11, it causes the printing unit 16 to print based on the print data.

The identification unit 182 identifies whether the state of the print processing unit 181 is a printing state in which the print processing unit 181 is executing a print process, or a standby state in which the print processing unit 181 is not executing a print process. For example, the identification unit 182 monitors the processing state of the print processing unit 181 to identify whether the state of the print processing unit 181 is a printing state or a standby state.

In response to receiving an operation from the display device 3 or input device 4 via the host I/F 12, the display data generation unit 183 generates display data corresponding to the operation. In addition, in response to acquiring information read from a barcode by the barcode reader 5 via the host I/F 12, the display data generation unit 183 generates display data corresponding to the information. For example, the display data generation unit 183 acquires display screen data stored in the storage device 6 via the host I/F 12, and generates display data based on a template or the like as the acquired display screen data.

The display data generation unit 183 generates display data with a color depth determined based on whether the state of the print processing unit 181 identified by the identification unit 182 is a printing state or a standby state. Specifically, when the state of the print processing unit 181 identified by the identification unit 182 is a standby state, the display data generation unit 183 generates display data with a first color depth based on display screen data corresponding to the first color depth stored in the storage device 6. Furthermore, when the state of the print processing unit 181 identified by the identification unit 182 is a printing state, the display data generation unit 183 generates display data with a second color depth lower than the first color depth by reducing the color depth of the display screen data corresponding to the first color depth stored in the storage device 6.

Display data with a first color depth is, for example, display data in RGB888 format, i.e., display data with a color depth of 24 bits. Display data with a second color depth is, for example, display data in RGB565 format, i.e., display data with a color depth of 16 bits.

Figure 4 illustrates a method for converting RGB888 format display data into RGB565 format display data. As shown in Figure 4, in the RGB888 format display data, data marked with "R" corresponds to the red component, data marked with "G" corresponds to the green component, and data marked with "B" corresponds to the blue component. As shown in Figure 4, the display data generation unit 183 converts 24-bit RGB888 format display data into 16-bit RGB565 format display data by extracting the five most significant bits (R7 to R3) of the 8-bit data (R0 to R7) corresponding to the red component of the RGB888 format display data, the six most significant bits (G7 to G2) of the 8-bit data (G0 to G7) corresponding to the green component, and the five most significant bits (B7 to B3) of the 8-bit data (B0 to B7) corresponding to the blue component.

The display data generation unit 183 stores the generated display data in a frame buffer provided in the storage unit 17. Typically, two frame buffers (e.g., frame buffers A and B) are provided. For example, if the refresh rate of the display device 3 is 60 Hz, the display data generation unit 183 generates display data at a cycle of 60 Hz and stores it alternately in the two frame buffers. According to the present invention, the display data generation unit 183 changes the color depth of the display data stored in the storage unit 17 depending on the operating state of the print processing unit 181, as described above, thereby making it possible to adjust the amount of display data.

The display processing unit 184 causes the display device 3 to display an image based on the display data generated by the display data generation unit 183. The display processing unit 184 transfers one frame's worth of data stored in the frame buffer to the downstream bridge IC 14. For example, if the refresh rate of the display device 3 is 60 Hz, the display processing unit 184 transfers the display data stored in frame buffer A and frame buffer B to the bridge IC 14 while flipping between frame buffer A and frame buffer B at a cycle of 60 Hz. The display processing unit 184 and bridge IC 14 are connected via a high-speed serial transfer interface known as MIPI (Mobile Industry Processor Interface) DSI.

As described above, the bridge IC 14 has a bridge function for transferring data transferred from the display processing unit 184, which is the upstream DSI host, via the DSI interface to the display device 3 via the DisplayPort interface or HDMI. The bridge IC 14 can either transfer color data transferred via the DSI interface to the display device 3 in its original format (i.e., transfer RGB565 format or RGB888 format data to the display device 3 in its original format), or it can complement data that has been color-reduced to RGB565 format with 24-bit data in RGB888 format and transfer it to the display device 3.

Figure 5 illustrates a method for converting RGB565 format display data into RGB888 format display data. For example, as shown in Figure 5, the bridge IC 14 converts RGB565 format display data into RGB888 format display data by appending a predetermined number of bits of data at the beginning of each color to the end of the data corresponding to each color element of the RGB565 format display data. For example, the bridge IC 14 appends the first three bits of data (R4 to R2) of the red element as complementary data to the least significant bit (LSB) of the data corresponding to the red element of the RGB565 format display data. The display processing unit 184 also appends the first two bits of data (G5, G4) of the green element as complementary data to the least significant bit of the data corresponding to the green element. The display processing unit 184 also appends the first three bits of data (B4 to B2) of the blue element as complementary data to the least significant bit of the data corresponding to the blue element. Furthermore, since the interpolation process in the bridge IC 14 is performed by dedicated hardware, there are no problems such as delays in the data to be transferred to the display device 3.

As described above, when the display data generation unit 183 generates display data to be stored in the frame buffer, the amount of data for one frame is adjusted by adjusting the color depth of the display data, but this is not limited to this. When the display data generation unit 183 generates display data, it may store the display data in the frame buffer without changing the color depth, and the display processing unit 184 may adjust the amount of data for one frame by adjusting the color depth of the display data stored in the frame buffer.

If the display device 3 is capable of displaying 24-bit display data in RGB888 format, but not 16-bit display data in RGB565 format, and 16-bit display data in RGB565 format is stored in the frame buffer, a problem occurs in which the display image cannot be displayed on the display device 3, even if the display processing unit 184 outputs the display data stored in the frame buffer to the bridge IC 14.

In response to this, when the color depth of the display data generated by the display data generation unit 183 is the second color depth, i.e., when the display device 3 is not capable of displaying 16-bit display data in RGB565 format, the display processing unit 184 may add complementary data to the display data to generate display data of a predetermined bit width corresponding to the first color depth.

For example, the display processing unit 184 acquires EDID (Extended Display Identification Data) containing information indicating the color data format supported by the display device 3, and determines whether the display device 3 is capable of displaying display data in RGB565 format based on the information contained in the EDID. If the display processing unit 184 determines that the display device 3 is not capable of displaying 16-bit display data in RGB565 format, it converts the 16-bit display data in RGB565 format stored in the frame buffer into 24-bit (predetermined bit width) display data in RGB888 format using a process similar to that shown in FIG. 5.

The display processing unit 184 then outputs the generated display data in RGB888 format to the bridge IC 14, causing the display device 3 to display an image based on the display data of the specified bit width. In this way, the printing device 1 can cause the display device 3 to display an image corresponding to the display data, even if the display device 3 does not support displaying 16-bit display data in RGB565 format.

The display data generation unit 183 may set the determined color depth in the bridge IC 14, which functions as a display controller that displays the display data on the display device 3. This allows the bridge IC 14 to display on the display device 3 a display image based on data in a color format that corresponds to the color depth determined by the display data generation unit 183, transferred from an upstream DSI host via the DSI interface.

[Operation flow]
Next, a description will be given of the flow of processing in which the printing device 1 causes the display device 3 to display a display image based on display data. Fig. 6 is a flowchart showing the flow of processing in which the printing device 1 causes the display device 3 to display a display image based on display data. Note that this flowchart starts when the display data generation unit 183 receives an operation from the display device 3 or the input device 4 via the host I/F 12, or when the barcode reader 5 reads a barcode and the display data generation unit 183 acquires information indicated by the barcode.

First, the identification unit 182 identifies whether the state of the print processing unit 181 is a printing state in which the print processing unit 181 is executing a print process, or a standby state in which the print processing unit 181 is not executing a print process (S1).

Next, the display data generation unit 183 determines whether the state of the print processing unit 181 identified by the identification unit 182 is a standby state (S2). If the display data generation unit 183 determines that the print processing unit 181 is in a standby state (YES in S2), the process proceeds to S3. If the display data generation unit 183 determines that the print processing unit 181 is in a printing state rather than a standby state (NO in S2), the process proceeds to S6.

In S3, the display data generation unit 183 determines the color depth of the display data to be the first color depth and generates display data at the first color depth. The display data generation unit 183 then stores the generated display data in the frame buffer (S4). Next, the display processing unit 184 outputs the display data stored in the frame buffer to the bridge IC 14 using DSI transfer as described above (S5). As a result, the bridge IC 14 displays a display image based on the display data transferred from the DSI host on the display device 3 via the DisplayPort interface or HDMI.

In S6, the display data generation unit 183 determines the color depth of the display data to be the second color depth and generates display data at the second color depth. The display data generation unit 183 then stores the generated display data in the frame buffer (S7). Next, the display processing unit 184 determines, based on the EDID acquired from the display device 3, whether the display device 3 can display a display image based on display data at the second color depth (S8). If the display processing unit 184 determines that the display device 3 can display a display image based on display data at the second color depth (YES in S8), it proceeds to S10. On the other hand, if the display processing unit 184 determines that the display device 3 cannot display a display image based on display data at the second color depth (NO in S8), it proceeds to S9, where it adds complementary data to the display data at the second color depth stored in the frame buffer to generate display data of a predetermined bit width corresponding to the first color depth.

At S10, the display processing unit 184 outputs the display data of the second color depth stored in the frame buffer, or the display data of the first color depth converted from the display data, to the bridge IC 14. As a result, the bridge IC 14 displays an image based on the display data on the display device 3.

[Modification 1]
In the above-described embodiment, the display data generation unit 183 generates display data of a first color depth when the print processing unit 181 is in a standby state, and generates display data of a second color depth when the print processing unit 181 is in a printing state, but this is not limited to this.

For example, the display data generation unit 183 may determine the color depth based on the number of pixels of the display device 3 and the state of the print processing unit 181 identified by the identification unit 182, and generate display data with the determined color depth. In this case, the storage unit 17 stores color depth information that associates the number of pixels of the display device expected to be connected to the printing device 1 with the color depth in both the printing state and the standby state.

The display data generation unit 183 determines the number of pixels of the display device 3. For example, the display data generation unit 183 acquires, from the display device 3, EDID including information indicating the number of pixels of the display device 3, and determines the number of pixels of the display device 3 based on the information indicating the number of pixels included in the EDID.

Once the display data generation unit 183 has identified the number of pixels of the display device 3, it references the color depth information stored in the memory unit 17 and determines the color depth associated with the state of the print processing unit 181 identified by the identification unit 182 and the identified number of pixels of the display device 3 as the color depth of the display data to be generated. The display data generation unit 183 then generates display data with the determined color depth.

By doing this, the printing device 1 can generate display data at a color depth that is appropriate for the number of pixels of the display device adopted as the display device 3 and that does not cause delays in the generation of the display data.

[Modification 2]
Furthermore, when the state of the print processing unit identified by the identification unit 182 is the standby state, the display data generation unit 183 may identify a first processing amount, which is the processing amount that the control unit 18 as a microcontroller can allocate to generating display data, the number of pixels of the display device 3, and the refresh rate of the display device 3. For example, the display data generation unit 183 acquires EDID from the display device 3, and identifies the number of horizontal and vertical pixels and the refresh rate of the display device 3 based on the EDID. Furthermore, the display data generation unit 183 identifies the maximum data processing amount of the control unit 18 as the first processing amount.

Then, the display data generation unit 183 may determine the color depth to be applied to the display data in the standby state based on the specified first processing amount, the number of pixels of the display device 3, and the refresh rate. For example, when the first processing amount is _Q1 , the number of horizontal pixels of the display device 3 is H, the number of vertical pixels is V, the refresh rate is Rf, the maximum value of the pixel clock frequency is fpmax, and the color depth is Cdp, it is necessary to ensure that the following formula (1) holds.
Q ₁ >fpmax×Cdp>H×V×Rf×Cdp...Formula (1)

Based on the magnitude relationship between _Q1 in formula (1) and H×V×Rf×Cdp, the following formula (2) is established.
Cdp<Q ₁ /(H×V×Rf) Formula (2)

Therefore, the display data generation unit 183 determines the color depth from among the color depths that the display device 3 can have, so that the identified first processing amount, the number of pixels of the display device 3, the refresh rate, and the color depth of the display device 3 satisfy equation (2).

In addition, when the state of the print processing unit 181 identified by the identification unit 182 is the printing state, the display data generation unit 183 may identify a second processing amount, which is the processing amount that the control unit 18 as a microcontroller can allocate to generating display data, the number of pixels of the display device 3, and the refresh rate of the display device.

For example, as described above, the display data generation unit 183 determines the number of horizontal and vertical pixels and the refresh rate of the display device 3 based on the EDID. Furthermore, the display data generation unit 183 determines the second processing volume based on the maximum data processing volume of the control unit 18 and the data processing volume used by the control unit 18 when the print processing unit 181 is in the printing state. Here, the display data generation unit 183 may determine the second processing volume based on the RAM occupancy rate of the memory unit 17 of the thread corresponding to the print processing unit 181 when the print processing unit 181 is in the printing state and the maximum data processing volume of the control unit 18.

The display data generation unit 183 may then determine the color depth to be applied to the display data in the print state based on the specified second processing amount, pixel clock frequency, number of pixels of the display device 3, and refresh rate. For example, when the second processing amount is _Q2 , the number of horizontal pixels of the display device 3 is H, the number of vertical pixels is V, the refresh rate is Rf, the maximum value of the pixel clock frequency is fpmax, and the color depth is Cdp, it is necessary to ensure that the following equation (3) holds.
Q ₂ >fpmax×Cdp>H×V×Rf×Cdp...Formula (3)

Based on the magnitude relationship between _Q2 in formula (3) and H×V×Rf×Cdp, the following formula (4) is established.
Cdp<Q ₂ /(H×V×Rf) Formula (4)

Therefore, the display data generation unit 183 determines the color depth from among the color depths that the display device 3 can take so that the identified second processing amount, the number of pixels of the display device 3, the refresh rate, and the color depth of the display device 3 satisfy equation (4).

By doing this, the printing device 1 can generate display data at a color depth that is appropriate for the specifications of its own microcontroller and the specifications of the display device 3, and that does not cause delays in the generation of the display data.

[Modification 3]
In the above embodiment, the display device 3 is connected externally to the printing device 1, but this is not limiting. The printing device 1 may have a display unit as the display device 3, and the display processing unit 184 may display a display image based on the display data generated by the display data generation unit 183 on the display unit of the printing device 1.

[Effects of the printing device 1]
As described above, the printing device 1 according to this embodiment identifies whether the state of the print processing unit is a printing state in which print processing is being performed or a standby state in which print processing is not being performed, generates display data with a color depth determined based on whether the identified state of the print processing unit is a printing state or a standby state, and displays a display image based on the generated display data on the display device 3. In this way, the printing device 1 can prevent the screen from becoming distorted during printing in a printing device that performs display processing on the display unit.

The present invention has been described above using embodiments, but the technical scope of the present invention is not limited to the scope described in the above embodiments, and various modifications and alterations are possible within the spirit of the invention. For example, all or part of the device can be configured by functionally or physically distributing or integrating any unit. Furthermore, new embodiments resulting from any combination of multiple embodiments are also included in the embodiments of the present invention. The effects of new embodiments resulting from the combination will also have the effects of the original embodiments.

1 Printing device 2 Host PC
3 Display device 4 Input device 5 Barcode reader 6 Storage device 7 Server 10 Bus line 11 Device I/F
12 Host I/F
13 Display I/F
14 Bridge IC
15 Network I/F
16 Printing unit 17 Storage unit 18 Control unit 181 Print processing unit 182 Identification unit 183 Display data generation unit 184 Display processing unit

Claims (9)

A printing device having a display processing unit that displays a display image on a display unit and a printing unit,
a print processing unit that executes a print process to cause the printing unit to print;
a determination unit that determines whether the state of the print processing unit is a printing state in which the print processing unit is executing the print processing or a standby state in which the print processing unit is not executing the print processing;
a display data generating unit that generates display data of a color depth determined based on whether the state of the print processing unit identified by the identifying unit is the printing state or the standby state;
and
the display processing unit causes the display unit to display the display image based on the display data generated by the display data generation unit.
Printing device. the display data generation unit generates display data of a first color depth when the state of the print processing unit identified by the identification unit is the standby state, and generates display data of a second color depth lower than the first color depth when the state identified by the identification unit is the printing state.
The printing device of claim 1 . the display data generation unit specifies the number of pixels of the display unit, and refers to color depth information stored in a storage unit that associates the number of pixels of the display unit with color depths in the printing state and the standby state, and generates the display data of the color depth associated with the state of the print processing unit specified by the specification unit and the specified number of pixels of the display unit.
The printing device of claim 1 . the display data generation unit acquires, from the display unit, Extended Display Identification Data (EDID) including information indicating the number of pixels of the display unit, and identifies the number of pixels of the display unit based on the acquired EDID.
The printing device according to claim 3 . the display data generation unit sets the determined color depth in a display controller that displays the display data on the display unit.
The printing device of claim 1 . the display processing unit generates display data of a predetermined bit width by adding complementary data to the display data generated by the display data generation unit, and causes a display unit to display the display image based on the generated display data of the predetermined bit width.
The printing device of claim 1 . the printing device has a microcontroller that functions as the print processing unit, the display data generating unit, and the display processing unit;
the display data generation unit identifies a first processing amount, which is a processing amount that the microcontroller can allocate to generating display data when the state of the print processing unit identified by the identification unit is the standby state, the number of pixels of the display unit, and a refresh rate of the display unit, and determines a color depth to be applied to the display data in the standby state based on the identified first processing amount, the number of pixels, and the refresh rate.
The printing device of claim 1 . the printing device has a microcontroller that functions as the print processing unit, the display data generating unit, and the display processing unit;
the display data generation unit identifies a second processing amount, which is a processing amount that the microcontroller can allocate to generating display data when the state of the print processing unit identified by the identification unit is the printing state, the number of pixels of the display unit, and a refresh rate of the display unit, and determines a color depth to be applied to the display data in the printing state based on the identified second processing amount, the number of pixels, and the refresh rate.
The printing device of claim 1 . a printing device having a display processing unit that displays a display image on a display unit and a printing unit;
a print processing unit that executes a print process to cause the printing unit to print;
a determination unit that determines whether the state of the print processing unit is a printing state in which the print processing unit is executing the print processing or a standby state in which the print processing unit is not executing the print processing;
a display data generating unit that generates display data having a color depth determined based on whether the state of the print processing unit is the printing state or the standby state; and
the display processing unit causing the display unit to display a display image based on the display data generated by the display data generation unit;
A program that functions as a