JP2022182985A - Display device and display method thereof - Google Patents

Abstract

To provide a display device and a display method thereof that can adjust a display direction of a video screen according to an installation state of the display device to accurately display the video screen.SOLUTION: A display device includes a plurality of memory chips, and the display device actuates a corresponding memory chip based upon an installation state of the device, and outputs a mode adjustment notice signal to a host so as to give notice that the host needs to re-read extension display identification data of the actuated memory.SELECTED DRAWING: Figure 1

Description

The present invention relates to an electronic device, and more particularly to a display device and display method thereof.

The display stores Extended Display Identification data (EDID) in the display's memory during the manufacturing process. The extended display identification data has a standard video data format of basic data related to display capabilities, such as maximum screen size, screen resolution, color depth, frequency, digital and analog format, thus connecting the playback device to the display. When connected, the extended display identification code can be read from the memory associated with that connector, and the associated functions of the display can be obtained.

For displays whose orientation can be altered, such as displays that can be changed from an originally horizontal orientation to a vertical orientation by a rotating mechanism, after the orientation of the display has been altered, the source of the video signal (e.g., a computer or Other playback devices) cannot know the change in the installation state of the display, and therefore cannot actively change the display method according to the change in the installation state of the display to accurately display the video content. .

SUMMARY OF THE INVENTION The present invention provides a display device and a method of displaying the same, which can adjust the display direction of the video screen according to the installation state of the display device to accurately display the video screen.

A display device of the present invention includes a state detection module, a plurality of memory chips, and a control circuit. The state detection module detects the installation state of the display device. Each memory chip stores extended display identification data, and the extended display identification data stored in each memory chip corresponds to different installation conditions. The control circuit is connected to the state detection module and the plurality of memory chips, activates the corresponding memory chips according to the installation state of the display device, and notifies the host to reload the extended display identification data of the activated memory chips. Therefore, a mode adjustment notification signal is output to the host.

In one embodiment of the present invention, the state detection module described above detects the rotation angle of the display device to detect the installation state of the display device.

In one embodiment of the present invention, the state detection module described above includes a first tilt switch and a second tilt switch, wherein the first tilt switch and the second tilt switch output detection signals according to the installation state of the display device. Then, the control circuit operates the memory chip corresponding to the installation state of the display device based on the detection signal.

In one embodiment of the invention, the control circuit described above includes a demultiplexer and a reset circuit. A demultiplexer is connected to the first tilt switch, the second tilt switch, and the plurality of memory chips, and the demultiplexer outputs an enable signal to the memory chip corresponding to the installation state of the display device according to the detection signal. A reset circuit is coupled to the demultiplexer and modifies the voltage level of the mode adjustment notification signal based on the detection signal to notify the host to reread the extended display identification data of the activated memory chip.

In one embodiment of the present invention, the reset circuit described above, based on the detection signal, outputs the mode adjustment notification signal from a high voltage level to notify the host to reread the extended display identification data of the activated memory chip. Change to a low voltage level for a predetermined time.

In one embodiment of the present invention, the mode adjustment notification signal mentioned above is a hot plug detect signal.

In one embodiment of the invention, the reset circuit described above comprises a first capacitor, a second capacitor, a first resistor, a second resistor, a third resistor, a first transistor, and a second transistor. include. A first end of the first capacitor is connected to the output end of the demultiplexer. The first transistor is connected between the second end of the first capacitor and ground. A second capacitor is connected between the first resistor and the first end of the first capacitor and ground. A second resistor is connected between the common junction of the first resistor and the second capacitor and the control end of the first transistor. A first end of the third resistor is connected to a second end of the first capacitor. The second transistor is connected between the output terminal of the reset circuit and ground, and the control terminal of the second transistor is connected to the second terminal of the third resistor.

In one embodiment of the invention, each memory chip includes memory and transistors. The memory is connected to the power supply voltage. A transistor is connected between the memory and ground, and a control end of the transistor is connected to the demultiplexer and is turned on under the control of an enable signal to operate the memory.

The present invention also provides a display method for a display device. The display device includes multiple memory chips, and the extended display identification data stored in each memory chip corresponds to a different installation state of the display device. The display method of the display device includes the following steps. Detects the installation state of the display device. A corresponding memory chip is activated based on the detected installation state. A mode adjustment notification signal is output to the host to notify the host to reread the extended display identification data of the activated memory chip.

In one embodiment of the present invention, the display method of the display device described above includes detecting the rotation angle of the display device to detect the installation state of the display device.

In one embodiment of the present invention, the step of detecting the installation state of the display device includes determining the installation state of the display device using the conductive states of the first tilt switch and the second tilt switch.

In one embodiment of the present invention, the display method of the display device as described above adjusts the voltage level of the mode adjustment notification signal to notify the host to reload the extended display identification data of the activated memory chip. including.

In one embodiment of the present invention, the display method of the display device described above shifts the mode adjustment notification signal from a high voltage level to a low voltage to notify the host to reload the extended display identification data of the activated memory chip. It includes changing to a level for a predetermined time.

In one embodiment of the present invention, the mode adjustment notification signal mentioned above is a hot plug detect signal.

Based on the above, the display device of the embodiment of the present invention includes a plurality of memory chips, the display device activates the corresponding memory chips according to its installation state, and reloads the extended display identification data of the activated memory chips. A mode adjustment notification signal can be output to the host to notify the host to do so. In this manner, when the installation state of the display device is changed, the corresponding display data is transmitted, and the display device adjusts the screen display direction according to the change in the installation state to accurately display the video screen. The host can be actively reloaded with extended display identification data.

1 is a schematic diagram of a display device according to an embodiment of the invention; FIG. FIG. 4 is a schematic diagram of a display device according to another embodiment of the present invention; FIG. 4 is a schematic diagram of a display device according to another embodiment of the present invention; FIG. 4 is a schematic diagram of a display device according to another embodiment of the present invention; FIG. 4 is a schematic diagram of a display device according to another embodiment of the present invention; FIG. 4 is a schematic diagram of a display device according to another embodiment of the present invention; 1 is a schematic diagram of a memory chip according to an embodiment of the invention; FIG. 1 is a schematic diagram of a reset circuit according to an embodiment of the invention; FIG. FIG. 4 is a waveform diagram of a mode adjustment notification signal according to an embodiment of the present invention; 4 is a flow diagram of a display method for a display device according to an embodiment of the present invention; FIG.

FIG. 1 is a schematic diagram of a display device according to an embodiment of the invention. Referring to FIG. 1, the display device 102 includes memory chips CP1-CP4, a control circuit 104, and a state detection module 106. The control circuit 104 is connected to the memory chips CP1-CP4 and the state detection module 106. . The display device 102 may be, for example, but not limited to, a liquid crystal display or a projector, and may be any type of interface, such as a video graphics array (VGA) interface, a digital visual interface (DVI), or a DisplayPort interface, coupled with the host 108 . It can be an interface standard.

The memory chips CP1-CP4 may be, for example, PROM (Programmable Read Only Memory) chips or EEPROM (Electrically Erasable Programmable Read Only Memory) chips, each of which can store extended display identification data, and the extended display identification data is A plurality of predetermined display signal formats may be included. Among them, the extended display identification data stored in each of the memory chips CP1 to CP4 can be used for the display devices 102 with different installation states. That is, the display signal format of the extended display identification data stored in each of the memory chips CP1 to CP4 corresponds to one screen display direction of the display device 102, respectively.

For example, the display signal format recorded in the extended display identification data of the memory chip CP1 corresponds to the horizontal direction when the rotation angle of the display device 102 is 0°, and has a resolution of 4096×2160, a screen display direction, and a scanning direction. It contains the information of frequency 60Hz. The display signal format recorded in the extended display identification data of the memory chip CP2 corresponds to the vertical direction when the rotation angle of the display device 102 is 90°, and the information of resolution 2160×4096, screen display direction, and scanning frequency 60 Hz. include. The display signal format recorded in the extended display identification data of the memory chip CP3 corresponds to the horizontal direction when the rotation angle of the display device 102 is 180°, and the information of resolution 4096×2160, screen display direction, and scanning frequency 60 Hz. include. The display signal format recorded in the extended display identification data of the memory chip CP4 corresponds to the vertical direction when the rotation angle of the display device 102 is 270°, and the information of resolution 2160×4096, screen display direction, and scanning frequency 60 Hz. include.

The state detection module 106 can detect the orientation of the display device 102, such as horizontal orientation in FIGS. 2A and 2C and vertical orientation in FIGS. 2B and 2D. State detection module 106 may include tilt switches TS1 and TS2. In order to detect whether the display device 102 is in horizontal or vertical installation, the included angle between tilt switches TS1 and TS2 is less than 180° (eg, but not limited to 90°). The tilt switches TS1 and TS2 send detection signals (in the embodiments of FIGS. existing) can be output to the control circuit 104 . In FIG. 2A, when the display device 102 is in a horizontal installation with a rotation angle of 0°, the tilt switches TS1 and TS2 are conductive and output a 2-bit signal “11” to the control circuit 104 . In FIG. 2B, when the display device 102 is in a vertical installation with a rotation angle of 90°, the tilt switch TS1 is blocked and the tilt switch TS2 is turned on to output a 2-bit signal “01” to the control circuit 104; In FIG. 2C , when the display device 102 is in the horizontal installation with a rotation angle of 180°, the tilt switches TS1 and TS2 are cut off and output a 2-bit signal “00” to the control circuit 104 . In FIG. 2D, when the display device 102 is in a vertical installation with a rotation angle of 270°, the tilt switch TS1 is conductive and the tilt switch TS2 is blocked, outputting a 2-bit signal “10” to the control circuit 104 .

The control circuit 104 activates the corresponding memory chips according to the 2-bit signals provided by the tilt switches TS1 and TS2, and notifies the host 108 to reload the extended display identification data of the activated memory chips of the display device 102. , outputs a mode adjustment notification signal HPD to the host 108 to cause the host 108 to transmit display data corresponding to the installation state of the display device 102 to the display device 102 . In this way, the display device 102 can adjust the screen display direction according to the change of the installation state to accurately display the video screen, and the video screen viewed by the user can be rotated by 90 degrees as the display device 102 is rotated. Avoid tilting or being upside down.

Further, the control circuit 104 may include a demultiplexer DEMUX and reset circuits RS1-RS4, eg, as shown in FIG. The demultiplexer DEMUX is connected to the tilt switches TS1 and TS2, the reset circuits RS1-RS4, and the memory chips CP1-CP4. The demultiplexer DEMUX outputs an enable signal E1 at its input terminal to one of the output terminals Y0-Y3 according to the bit signals S0, S1 provided by the tilt switches TS1, TS2. The relationship between the bit signals S0, S1 and the outputs Y0-Y3 from which the demultiplexer DEMUX selects the output of the enable signal E1 may be as shown in the following truth table (Table 1).

By way of example, when the bit signals provided by the tilt switches TS1, TS2 are 01 (i.e. bit signal S0 equals 0 and bit signal S1 equals 1), demultiplexer DEMUX resets enable signal E1 from output Y1. Output to the circuit RS2 and the memory chip CP2. The memory chip CP2 is activated by the enable signal E1, and the memory chips CP1, CP3 and CP4 are disabled. Further, the memory chip CP2 includes a memory 402 and a transistor Q1, for example, as shown in FIG. It is connected to the end Y1. When the control end of transistor Q1 receives an enable signal from output Y1, transistor Q1 becomes conductive and enables memory 402 to operate.

Also, the reset circuit RS2 may adjust the voltage level of the mode adjustment notification signal HPD based on the enable signal E1 in order to notify the host 108 to reload the extended display identification data of the memory chip CP2. Among them, the mode adjustment notification signal HPD is the hot plug detection signal on the hot plug detection pin HP1 in this embodiment, but is not limited to this.

Further, implementations of reset circuit RS2 may include resistors R1-R3, capacitors C1, C2, and transistors Q2, Q3, for example, as shown in FIG. A resistor R1 and a capacitor C1 are connected between the output terminal Y1 and ground. Capacitor C2 and transistor Q2 are connected between output terminal Y1 and ground. A resistor R2 is connected between the common junction of resistor R1 and capacitor C1 and the control end of transistor Q2. Transistor Q3 is connected between hot plug detect pin HP1 and ground. A resistor R3 is connected between the common junction of transistor Q2 and capacitor C2 and the control end of transistor Q3. As shown in FIG. 6, the enable signal E1 output from the output terminal Y1 first conducts the transistor Q3 through the capacitor C2 and the resistor R3, and the mode adjustment notification signal HPD on the hot plug detection pin HP1 is brought to a low voltage level. change. With the lapse of time, the control terminal voltage of the transistor Q2 gradually rises to a voltage at which the transistor Q2 can be turned on, the control terminal voltage of the transistor Q3 is lowered, and the transistor Q3 is cut off. Change to high voltage level. In this manner, the mode adjustment notification signal HPD changes from the high voltage level to the low voltage level for the predetermined time T1, thereby notifying the host 108 to reread the extended display identification data in the memory chip CP2. The predetermined time T1 may be determined, for example, from the resistance values of the resistors R1 to R3 and the capacitance values of the capacitors C1 and C2. The predetermined time T1 may be, for example, 0.5 to 1 ms, but is not limited to this.

Similarly, when the bit signals provided by the tilt switches TS1, TS2 are 11, 00, 10, the demultiplexer DEMUX outputs the enable signal E1 from the corresponding output terminals Y3, Y0, Y2 to the corresponding reset circuits and memory chips. , reset circuits RS1, RS3, RS4 and memory chips CP1, CP3, CP4 may also be the same as in FIGS. 5 and 4, for example, and will not be repeated here.

FIG. 7 is a flow diagram of a display method for a display device according to an embodiment of the present invention. The display device includes multiple memory chips, and the extended display identification data stored in each memory chip corresponds to a different installation state of the display device. As can be seen from the above embodiments, the display method of the display device includes at least the following steps. First, the installation state of the display device is detected (step S702). For example, by detecting the rotation angle of the display device, it is detected whether the installation state of the display device is horizontal or vertical. In some embodiments, two tilt switches may be used to detect the installation state of the display device, and the installation state of the display device may be determined through detecting the two tilt switches. Then, the corresponding memory chip is activated based on the detected installation state (step S704). For example, the installation state of the display device may be determined based on the 2-bit detection signals provided by the two tilt switches. Then output a mode adjustment notification signal to the host to notify the host to re-read the extended display identification data of the activated memory chip (step S706). For example, the voltage level of the mode adjustment notification signal may be varied, and the mode adjustment notification signal is predetermined from a high voltage level to a low voltage level to notify the host to reload the extended display identification data of the activated memory chip. change over time. The mode adjustment notification signal may be, for example, a hot plug detection signal, but is not limited to this.

In summary, the display device of the embodiment of the present invention includes a plurality of memory chips, the display device activates the corresponding memory chips according to its installation state, and reloads the extended display identification data of the activated memory chips. A mode adjustment notification signal is output to the host to notify the host to do so. In this way, when the installation state of the display device is changed, the host is made to actively re-read the extended display identification data in order to transmit the corresponding display data, and the display device responds to the change in the installation state and displays the screen. The direction can be adjusted and the video screen can be displayed accurately.

102: display device 104: control circuit 106: state detection module 108: host 402: memory CP1-CP4: memory chip HPD: mode adjustment notification signal TS1, TS2: tilt switch DEMUX: demultiplexer RS1-RS4: reset circuit S0, S1 : bit signal E1: enable signal Y0 to Y3: output terminal Q1, Q2, Q4: transistor HP1: hot plug detection pin R1 to R3: resistor C1, C2: capacitor S702 to S706: display method steps of display device

Claims (14)

A display device,
a state detection module that detects an installation state of the display device;
a plurality of memory chips each storing extended display identification data corresponding to a different installation state;
connected to the state detection module and the memory chip, activating the corresponding memory chip according to the installation state of the display device, and notifying the host to reload the extended display identification data of the activated memory chip; a control circuit that outputs a mode adjustment notification signal to the host,
display device. wherein the state detection module detects the rotation angle of the display device to detect the installation state of the display device;
The display device according to claim 1. The state detection module includes a first tilt switch and a second tilt switch, wherein the first tilt switch and the second tilt switch output detection signals according to the installation state of the display device, and the control circuit detects the operating a memory chip corresponding to the installation state of the display device based on the detection signal;
The display device according to claim 1 or 2. The control circuit
a demultiplexer connected to the first tilt switch, the second tilt switch, and the memory chip for outputting an enable signal to the memory chip corresponding to the installation state of the display device based on the detection signal;
a reset circuit coupled to the demultiplexer for changing the voltage level of the mode adjustment notification signal based on the detection signal to notify the host to reread the extended display identification data of the activated memory chip; including,
The display device according to claim 3. The reset circuit changes the mode adjustment notification signal from a high voltage level to a low voltage level based on the detection signal for a predetermined time to notify the host to reread the extended display identification data of the activated memory chip. let
The display device according to claim 4. wherein the mode adjustment notification signal is a hot plug detection signal;
The display device according to claim 4 or 5. The reset circuit
a first capacitor having a first end connected to the output end of the demultiplexer;
a first transistor connected between the second end of the first capacitor and ground;
a first resistor;
a second capacitor connected between the first end of the first resistor and the first capacitor and the ground;
a second resistor connected between a common point of the first resistor and the second capacitor and a control terminal of the first transistor;
a third resistor having a first end coupled to a second end of the first capacitor;
a second transistor connected between the output end of the reset circuit and the ground, and having a control end connected to a second end of a third resistor;
The display device according to any one of claims 4 to 6. Each memory chip
a memory coupled to a power supply voltage;
a transistor coupled between the memory and ground;
a control end of the transistor is connected to the demultiplexer and is turned on under the control of the enable signal to operate the memory;
The display device according to any one of claims 4 to 7. A display method for a display device, wherein the display device comprises a plurality of memory chips, extended display identification data stored in each memory chip corresponds to different installation states of the display device,
detecting an installation state of the display device;
activating a corresponding memory chip based on the detected installation state;
outputting a mode adjustment notification signal to the host to notify the host to reread the extended display identification data of the activated memory chip;
The display method of the display device. detecting the rotation angle of the display device to detect the installation state of the display device;
The display method of the display device according to claim 9. The step of detecting the installation state of the display device comprises:
determining the installation state of the display device using the conduction state of the first tilt switch and the second tilt switch;
The display method of the display device according to claim 9 or 10. changing the voltage level of the mode adjustment notification signal to notify the host to reread the extended display identification data of the activated memory chip;
The display method of the display device according to any one of claims 9 to 11. changing the mode adjustment notification signal from a high voltage level to a low voltage level for a predetermined time to notify the host to reread the extended display identification data of the activated memory chip;
The display method of the display device according to claim 12. wherein the mode adjustment notification signal is a hot plug detection signal;
The display method of the display device according to any one of claims 9 to 13.

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