Display device detection method and system

Abstract

The present invention discloses a display device detecting method and system.SOLUTION: Providing a display signal having a preset frequency range value, providing a detection mode and generating a detection pattern, converting the detection pattern into specific detection signals having the frequency range value, combining the specific detection signals to form a combined detection signal having the same frequency range value, and analyzing the combined detection signal, comparing the frequency range value with the preset frequency range value, and determining an abnormality if the frequency range value is different from the preset frequency range value.SELECTED DRAWING: Figure 6

Description

[Technical Field]

[0001] The present invention relates to display devices, and more particularly to display device detection methods and systems. [Background technology]

[0002] Generally, display devices (e.g., LCD screens) are widely used in various aspects of daily life. However, during actual work, inspection and maintenance personnel usually have to go to the site and visually inspect each display device to see if there are any abnormalities (e.g., malfunctions or damage), which is a huge waste of human resources and costs.

[0003] Although some high-end LCD screens can implement the self-detection function of the output signal through the driver integrated circuit, the display abnormality problems commonly seen in LCD screens are usually caused by physical failure factors (such as broken wires, poor connections, poor power supply, etc.), and even if the driver integrated circuit can effectively detect whether the output signal is normal or not, it still cannot effectively grasp the operating status of the receiving side. Summary of the Invention

[0004] In view of this, the present invention proposes a display device detection method and system to effectively solve the above problems encountered in the prior art.

[0005] A specific embodiment of the present invention is a display device detection method, which includes the steps of: providing a display signal having a preset frequency range value; providing a detection mode and generating a detection figure; converting the detection figure into a specific detection signal having a frequency range value; combining the specific detection signals to form a combined detection signal having the same frequency range value; analyzing the combined detection signal, comparing the frequency range value with the preset frequency range value, and determining an abnormality if the frequency range value is different from the preset frequency range value.

[0006] Another specific embodiment of the present invention is a display device detection system. In this embodiment, the display device detection system includes a target display device and a touch panel. The target display device provides display signals of a predetermined frequency range value, generates a detection pattern in a detection mode, and converts the detection pattern into a specific detection signal having the frequency range value. The touch panel is configured to combine the specific detection signals from the target display devices to form a combined detection signal having the same frequency range value. The touch panel analyzes the combined detection signal, compares the frequency range value with the predetermined frequency range value, and determines the target display device to be abnormal if the frequency range value is different from the predetermined frequency range value.

[0007] Compared with the prior art, the display device detection method and system proposed in the present invention uses a touch panel, such as a projected capacitive touch (PCT) panel, in a detection mode to detect whether a display abnormality exists in a target display device, such as a bonded liquid crystal display (LCD) panel. This not only enables abnormality detection of the target display device without the need for additional hardware equipment, but also enables remote detection of the display device via a network connection, allowing inspection and maintenance personnel to easily determine whether an abnormality has occurred in the display device without being present on-site, and only need to go to the site to handle the problem when notified of an abnormality in the display device. This effectively improves the efficiency of display device abnormality detection and significantly reduces waste of manpower and costs.

[0008] To further understand the features and technical contents of the present invention, please refer to the following detailed description of the invention and the drawings, which are for reference and explanation purposes only and are not intended to limit the present invention. [Brief explanation of the drawings]

[0009] [Figure 1] 1 shows a functional block diagram of a display device detection system according to an embodiment of the present invention. [Figure 2] 1A and 1B are schematic diagrams illustrating detection figures displayed by a detection object display device according to an embodiment of the present invention. [Figure 3] 10 is a schematic diagram showing a detection figure having a periodic pattern of horizontal stripes in an embodiment of the present invention; [Figure 4] 1 shows a schematic diagram in which a particular detected signal exhibits signal intensity peaks at several frequency range values ​​in the frequency domain in one embodiment of the present invention; [Figure 5A] 1 is a schematic diagram showing a detection target display device according to an embodiment of the present invention displaying detection figures by region; [Figure 5B] 1 is a schematic diagram showing a detection target display device according to an embodiment of the present invention displaying detection figures by region; [Figure 5C] 1 is a schematic diagram showing a detection target display device according to an embodiment of the present invention displaying detection figures by region; [Figure 6] 1 shows a flowchart of a display device detection method according to an embodiment of the present invention. [Figure 7] 1 shows a flowchart of a display device detection method according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0010] Hereinafter, the disclosed embodiments of the present invention will be described with reference to specific examples and Figures 1 to 7. Those skilled in the art can understand the advantages and effects of the present invention from the contents disclosed in this specification. However, the contents disclosed below are not intended to limit the protection scope of the present invention.

[0011] The structures depicted in the drawings of the present invention are not drawn to scale according to the shape and size of the actual implementation. For example, the dimensions of certain elements are exaggerated for ease of explanation. It should also be understood that when an element is described as being "coupled" to another element, it may be directly connected to the other element, indirectly connected to the other element, there may be intervening elements, and the connection may be wired and / or wireless.

[0012] One specific embodiment of the present invention is a display device detection system. In this embodiment, the display device detection system uses an existing touchscreen (e.g., a projected capacitive touchscreen) as a detection unit, disables the touch control function of the touchscreen itself in detection mode, and determines whether an abnormal phenomenon has occurred in the display device to be detected based on a specific detection signal having a frequency range value generated by the attached display device to be detected (e.g., a liquid crystal display), thereby enabling remote monitoring and detection of whether a display abnormality has occurred in the display device to be detected, thereby achieving substantial effects such as reducing personnel costs and equipment costs.

[0013] FIG. 1 illustrates a functional block diagram of a display device detection system according to this embodiment. As shown in FIG. 1, the display device detection system 1 includes a main control device 10, a touch panel 12, and a target display device 14. In practical applications, the main control device 10 may be, for example, but not limited to, a remote server or a host. The touch panel 12 may be, for example, but not limited to, a projected capacitive touch (PCT) panel. The target display device 14 may be, for example, but not limited to, a liquid crystal display (LCD) panel. The touch panel 12 may be bonded to the target display device 14 by, for example, direct bonding technology, or may have a bonding layer (not shown) between the touch panel 12 and the target display device 14. The system configured as described above can achieve the goal of detecting the target display device 14 using the touch panel 12.

[0014] In one embodiment, when the display device detection system 1 is about to start display abnormality detection, the main control unit 10 sends a detection command DC to the touch panel 12 and the display device 14 to be detected, respectively, and controls both the touch panel 12 and the display device 14 to enter detection mode. In actual application, the touch panel 12 and the display device 14 to be detected may be connected to a network, but is not limited to this, so that the main control unit 10 can transmit the detection command DC to the touch panel 12 and the display device 14 to be detected via the network. In another embodiment, the terminal devices such as the touch panel 12 and the display device 14 to be detected may have a built-in schedule for periodic automatic detection. For example, but is not limited to, the touch panel 12 and the display device 14 to be detected may automatically switch to detection mode at a set time every week.

[0015] The target display device 14 can acquire a display signal having a preset frequency range value. In the detection mode, the target display device 14 can generate a specially designed detection graphic DP (see FIG. 2 above) and convert it into a specific detection signal DS having a frequency range value. In the detection mode, the touch panel 12 disables its original touch control function and couples the specific detection signal DS from the target display device 14 to the touch panel 12 through an in-plane channel. In other words, the touch panel 12 replicates the specific detection signal DS from the target display device 14 to the touch panel 12, but is not limited to this.

[0016] In practical applications, the detection pattern DP may include, but is not limited to, a periodic pattern such as the checkerboard pattern shown in Fig. 2. The detection target display device 14 may convert the detection pattern DP into a specific detection signal DS having a frequency range value, for example, but is not limited to, through a Fast Fourier Transform (FFT).

[0017] It should be noted that, according to the principle of Fourier transform, the frequency range value of a particular detection signal DS is related to the spatial frequency of the periodic pattern of the detection figure DP. "Spatial frequency" refers to the number of occurrences of the same geometric structure (e.g., the periodic pattern of the detection figure DP) per unit length. Assuming that the distance between the same geometric structures (e.g., the periodic pattern of the detection figure DP) is λ, then the spatial frequency f=1 / λ.

[0018] For example, assuming that the periodic pattern of the detection figure DP is horizontal stripes ST, as shown in Figure 3, the width TH and spacing IN of the horizontal stripes ST are important factors in determining its spatial frequency. As the spacing IN of the horizontal stripes ST narrows, the number of horizontal stripes ST per unit length UL increases, the density of the horizontal stripes ST in the detection figure DP increases, and the spatial frequency becomes higher, resulting in a higher frequency range value of the specific detection signal DS. Conversely, as the spacing IN of the horizontal stripes ST widens, the number of horizontal stripes ST per unit length UL decreases, the density of the horizontal stripes ST in the detection figure DP decreases, and the spatial frequency becomes lower, resulting in a lower frequency range value of the specific detection signal DS.

[0019] Furthermore, the signal strength at a particular frequency range value of the detection signal DS is related to the grayscale difference (or voltage difference) of the periodic pattern of the detection figure DP. For example, the horizontal stripe pattern of the detection figure DP can increase the voltage difference between the stripes and the background by using a combination of the maximum grayscale difference (for example, the horizontal stripe pattern of the detection figure DP in FIG. 3 may use black stripes with the lowest grayscale value and a white background with the highest grayscale value, or the horizontal stripe pattern of the detection figure DP in another embodiment may use white stripes with the highest grayscale value and a black background with the lowest grayscale value), thereby increasing the signal strength at a particular frequency range value of the detection signal DS.

[0020] It should be noted that even if the detection target display device 14 of the present invention uses the same detection pattern DP, the frequency range value of the specific detection signal DS can actually be changed by adjusting the timing table or clock. In particular, the timing settings used in the detection mode do not need to consider the accuracy of the output screen (e.g., the screen needs to fill the active area). It is sufficient that the specific detection signal DS generated by the detection target display device 14 of the present invention has characteristics such as a frequency band different from the background signal, a stable and predictable frequency, and a signal strength sufficient to be detected by the touch integrated circuit, so as to smoothly complete the subsequent detection procedure. A signal strength sufficient to be detected refers to a signal-to-noise ratio (SNR) value large enough to distinguish the target signal strength from background noise and reduce the probability of misjudgment, such as SNR > 2 (i.e., 3 dB). The SNR value is not an absolute value and may vary depending on different circuit designs and firmware algorithms.

[0021] For example, the specific detection signal DS shown in Figure 4 exhibits signal intensity peaks P1-P4 with relatively high signal intensity at some specially designed frequency range values ​​(e.g., 2.5KHz, 5.5KHz, 8.5KHz, 11.8KHz) in the frequency domain, which fully satisfies the three characteristics described above, but is not limited thereto. In addition, different detection patterns DP can be set for different detection target display devices 14 according to actual needs, so that the specific detection signal DS can have preferred detectable frequency range values.

[0022] In the detection mode, the touch panel 12 combines the specific detection signals DS from the target display device 14 through its in-plane channel to form a combined detection signal CS, which has the same frequency range value as the specific detection signal DS. Next, the touch panel 12 analyzes the combined detection signal CS to obtain the frequency range value of the combined detection signal CS, and then compares the frequency range value with a preset frequency range value detected under normal conditions, and determines whether the target display device 14 has a display abnormality based on the comparison result.

[0023] It should be noted that in the detection mode, the transmitting (TX) electrode and the receiving (RX) electrode of the touch panel 12 can both be used as receiving (RX) electrodes to couple a specific detection signal DS from the target display device 14 to the touch panel 12. If the TX electrode and the RX electrode of the touch panel 12 are not on the same layer, an electrode layer close to the liquid crystal layer may be selected to increase the coupling capacitance, but this is not limitative.

[0024] In addition, the preset frequency range value used as the comparison reference value is usually obtained during the manufacturing process or on-site installation process of the touch display module, and the frequency range value detected in the detection mode when there is no abnormality in the display device 14 to be detected is obtained and stored in the memory of the touch integrated circuit as a reference value for later comparison.

[0025] The touch panel 12 can analyze and process the combined detection signal CS through its touch integrated circuit to obtain the frequency range value of the combined detection signal CS, and then compare the frequency range with the preset frequency range through its touch integrated circuit.

[0026] If the frequency range is the same as the preset frequency range, the touch integrated circuit determines that the display device 14 to be detected is normal and generates a normal signal NS to the main control device 10, and the main control device 10 maintains a normal operating state based on the normal signal NS. If the frequency range is different from the preset frequency range, the touch integrated circuit determines that the display device 14 to be detected is abnormal and generates an abnormality signal AS to the main control device 10, and the main control device 10 sends an abnormality notification message based on the abnormality signal AS to notify inspection and maintenance personnel to take action.

[0027] In another embodiment, when the touch integrated circuit compares the frequency range with the preset frequency range, it may use an appropriate tolerance value, that is, if the difference between the frequency range and the preset frequency range is smaller than the tolerance value, the two can be considered to be the same, but is not limited to this.

[0028] In practical application, the detection target display device 14 can also display the detection graphic DP in different regions, so that the touch integrated circuit can respectively determine whether different display regions of the detection target display device 14 are abnormal. For example, as shown in FIGS. 5A to 5C, the detection graphic DP having a checkered pattern is displayed in the left display region, the center display region, and the right display region of the detection target display device 14, respectively, so that the touch integrated circuit can more clearly determine which display region of the detection target display device 14 is actually abnormal. It should be noted that when the display region of the detection target display device 14 switches from displaying the detection graphic DP having the checkered pattern to displaying a black screen, the frequency range values ​​and signal strengths of the specific detection signal DS obtained based on the detection graphic DP (for example, the signal strength peaks P1 to P4 occurring at specific frequencies of 2.5 KHz, 5.5 KHz, 8.5 KHz, and 11.8 KHz shown in FIG. 4) disappear.

[0029] It should be noted that, according to actual needs, different detection patterns DP may be set for different detection target display devices 14, without being limited to the checkered or horizontal stripes in the above embodiment, so that the specific detection signal DS generated by the detection target display device 14 can have a preferred detectable frequency range value. The frequencies listed in the above embodiment are merely examples, and in actual design, the frequency range is not limited, and it is preferred to be able to set a suitable detection frequency.

[0030] Another specific embodiment of the present invention is a display device detection method. Please refer to FIG. 6, which shows a flowchart of the display device detection method in this embodiment. As shown in FIG. 6, the display device detection method includes: Step S10 of providing an indication signal having a preset frequency range value; Step S11 provides a detection mode and generates a detection graphic; Step S12 converting the detection pattern into a specific detection signal having a frequency range value; Step S13 of combining the particular detection signals to form a combined detection signal having the same frequency range value; Step S14 of analyzing the combined detection signal and comparing the frequency range value with a preset frequency range value; The method includes step S15 of determining that the frequency range value is normal if it is the same as a preset frequency range value, and determining that the frequency range value is abnormal if it is different from the preset frequency range value.

[0031] In practical applications, the touch panel may be a projected capacitive touch panel, and the target display device may be, but is not limited to, a liquid crystal display panel. The touch panel may be bonded to the target display device using full bonding technology, but is not limited to this. The touch panel and the target display device may enter detection mode based on a detection command transmitted from a remote server or host, or the touch panel and the target display device may have a periodic automatic detection schedule built in. For example, but not limited to, the touch panel and the target display device may automatically switch to detection mode at a set time every week. In addition, in detection mode, the touch panel disables its touch control function to avoid affecting the detection results.

[0032] In one embodiment, the detection target display device can display detection patterns one by one for each region, and the detection patterns may include a periodic pattern (e.g., a checkerboard or horizontal stripes). A frequency range value of a specific detection signal is related to a spatial frequency of the periodic pattern, and a specific signal intensity in the frequency range value of the specific detection signal is related to a grayscale value difference (or voltage difference) of the periodic pattern, but is not limited thereto.

[0033] In another embodiment, as shown in FIG. 7, a display device detection method includes the following steps.

[0034] In step S20, the detection target display device and the touch panel enter a detection mode.

[0035] In step S21, the detection object display device displays a detection graphic and generates a specific detection signal having a frequency range value and a signal strength.

[0036] In step S22, the touch panel combines the particular detection signals from the target display devices to form a combined detection signal having the same frequency range value and signal strength.

[0037] In step S23, it is determined whether the frequency range is the same as a preset frequency range and whether the signal strength is the same as a preset signal strength.

[0038] If the judgment result of step S23 is YES, that is, if the frequency range is the same as the preset frequency range and the signal strength is the same as the preset signal strength, steps S24 and S25 are executed in sequence, that is, the display device to be detected is determined to be normal and a normal signal is generated, and the main control device maintains a normal operating state according to the normal signal.

[0039] If the judgment result of step S23 is NO, that is, if the frequency range is different from the preset frequency range and / or the signal strength is different from the preset signal strength, steps S26 and S27 are executed in sequence, that is, the display device to be detected is determined to be abnormal and an abnormality signal is generated, and the main control device sends an abnormality notification message in response to the abnormality signal.

[0040] In practical application, the preset frequency range value and the preset signal intensity in step S23 may be obtained during the manufacturing process or on-site installation process of the touch display module, and thus, when the display device to be detected is normal, the frequency range value and the signal intensity detected in the detection mode are obtained and stored in the memory of the touch integrated circuit as reference values ​​for comparison, but this is not limited to this. In addition, when determining whether the frequency range is the same as the preset frequency range and whether the signal intensity is the same as the preset signal intensity in step S23, an appropriate tolerance value may be used, that is, if the difference between the frequency range and the preset frequency range and the difference between the signal intensity and the preset signal intensity are smaller than the tolerance value, they can be considered to be the same, but this is not limited to this.

[0041] It should be noted that the display device detection method is not limited to the checkerboard or horizontal stripe pattern in the above embodiment, and different specific detection patterns may be set for different display devices to be detected, so that the specific detection signal generated by the display device to be detected has a preferred detectable frequency range value. The specific frequencies listed in the above embodiment are merely examples, and in actual design, the frequency range is not limited, and it is preferred to be able to set a suitable detection frequency.

[0042] To summarize the above, the display device detection system and method proposed in the present invention, in detection mode, uses a touch panel such as a projected capacitive touch panel to detect whether a display abnormality exists in a target display device such as a bonded LCD panel, and not only can it achieve abnormality detection of the target display device without adding additional hardware equipment, but it can also achieve remote detection of the display device via a network connection, allowing inspection and maintenance personnel to easily determine whether an abnormality has occurred in the display device even when they are not on site, and only need to go to the site to handle the abnormality when notified. This effectively improves the efficiency of display device abnormality detection and significantly reduces waste of manpower and costs.

[0043] The above disclosure is merely a feasible preferred embodiment of the present invention, and does not limit the scope of the claims of the present invention. Therefore, all equivalent technical modifications made using the contents of the description and drawings of the present invention are included in the scope of the claims of the present invention. [Explanation of symbols]

[0044] 1 Display Device Detection System 10 Main control unit 12 Touch Panel 14 Detection target display device DC detection instruction DS Specific detection signal CS Coupling detection signal NS normal signal AS abnormal signal DP specific detection shapes ST horizontal stripes TH width IN interval UL unit length P1~P4 signal strength peaks S10~S15 steps Steps S20~S27

Claims

1. providing an indication signal having a preset frequency range value; providing a detection mode and generating a detection graphic; converting the detected pattern into a specific detected signal having a frequency range value; combining the particular detected signals to form a combined detected signal having the same frequency range value; analyzing the combined detection signal, comparing the frequency range value with the preset frequency range value, and determining an abnormality if the frequency range value is different from the preset frequency range value.

2. 2. The display device detection method according to claim 1, wherein the signal strength of the specific detection signal is related to a grayscale value difference of the periodic pattern of the detection figure.

3. The display device detection method of claim 1 , further comprising the step of sending a detection command and entering the detection mode.

4. 2. The display device detection method according to claim 1, further comprising the step of displaying the detection graphic by region and determining whether or not each of a plurality of display regions is abnormal.

5. The display device detection method according to claim 1 , further comprising disabling a touch control function in the detection mode.

6. a detection object display device that provides a display signal of a preset frequency range value, generates a detection figure in a detection mode, and converts the detection figure into a specific detection signal having a frequency range value; a touch panel configured to combine the specific detection signals from the display devices to be detected to form a combined detection signal having the same frequency range value, wherein the touch panel analyzes the combined detection signal, compares the frequency range value with the preset frequency range value, and determines that the display device to be detected is abnormal if the frequency range value differs from the preset frequency range value.

7. 7. The display device detection system according to claim 6, wherein the signal strength of the particular detection signal is related to a grayscale value difference of the periodic pattern of the detection figure.

8. The display device detection system of claim 6, further comprising a main control device coupled to the touch panel and the display device to be detected, respectively, and configured to send a detection command to control the touch panel and the display device to be detected to enter the detection mode.

9. The display device detection system according to claim 6 , further comprising an adhesive layer between the touch panel and the display device to be detected.

10. 7. The display device detection system according to claim 6, wherein the detection target display device displays the detection graphic by area, and determines whether or not each of a plurality of display areas of the detection target display device is abnormal.

11. The display device detection system of claim 6 , wherein the touch panel disables a touch control function in the detection mode.

Images