JP2007093939A - Liquid crystal display, electronic device, its manufacturing method,program, and recording medium - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a liquid crystal display using OCB mode liquid crystals capable of correctly estimating the temperature of the liquid crystal display panel. <P>SOLUTION: This liquid crystal display has a liquid crystal display panel 11, a back light unit 12 arranged at its back, a first temperature sensor 14 to detect the temperature of the liquid crystal display panel 11, a second temperature sensor 15 to detect the outside air temperature, a panel temperature estimation means 23 to estimate the temperature of the liquid crystal display panel 11, and a panel control circuit 13 having a panel controller 25 to control the display based on the estimated temperature. The panel temperature estimation means 23 has the sets of the correlation information 26 of the temperatures detected by the first temperature sensor 14 and the temperatures 11 of the liquid crystal display panel for various kinds of the outside temperatures. It picks up the adaptable correlation information from the sets of the correlation information 26, based on the detected outside air temperature and estimates the temperature of the liquid crystal display panel 11 from the temperature detected by the first temperature sensor 14 using the correlation information it picks up. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a liquid crystal display device using an OCB mode liquid crystal, an electronic device, and a method for manufacturing the electronic device.

  Liquid crystal display devices are thin and lightweight, and their use has been expanded in recent years as an alternative to conventional cathode ray tubes. However, currently widely used TN (Twisted Nematic) alignment liquid crystal display panels have a narrow viewing angle, a slow response speed, and appear to have a tail when moving images are displayed.

  On the other hand, in recent years, a liquid crystal display device including an OCB (Optically Compensated Birefringence) mode liquid crystal display element having characteristics of a high-speed response and a high viewing angle has been used. In this liquid crystal display device, a liquid crystal is bent to perform visual compensation, and an optical phase compensation film is combined with this to obtain a wide viewing angle.

  FIG. 11 is a cross-sectional view schematically illustrating an alignment state of liquid crystal molecules included in the OCB mode liquid crystal display element. 11 (a) and 11 (b) are cross-sectional views showing a voltage application state, and FIG. 11 (c) is a cross-sectional view showing a voltage non-application state.

  Nematic liquid crystal is injected between the glass substrates 91 of the liquid crystal display panel constituting the liquid crystal display device using the OCB mode liquid crystal display element as shown as liquid crystal molecules 92 in FIG. The alignment state of the liquid crystal to which no voltage is applied is called a splay state 93. When a power supply of a liquid crystal display device using an OCB mode liquid crystal display element is turned on, it is necessary to perform driving called transfer driving. In other words, the transfer driving means that a relatively large voltage of about 20 to 25 volts is applied to the liquid crystal layer when the liquid crystal display device is turned on, so that the splay state 93 shown in FIG. ), Driving to shift to the bend states 94a and 94b shown in FIG. The display using the bend states 94a and 94b is a feature of the liquid crystal display device using the OCB mode liquid crystal display element. By changing the bend state according to the voltage, the transmittance of the panel can be increased. It is something to change.

  A bend state 94a shown in FIG. 11A indicates a bend state when white is displayed, and a bend state 94b shown in FIG. 11B indicates a bend state when black is displayed. .

  Further, in a liquid crystal display device using an OCB mode liquid crystal display element, when a voltage of 2 volts or less is continuously applied to the liquid crystal display panel, the alignment state of the liquid crystal gradually changes from the bend states 94a and 94b to the splay state 93. (Hereinafter, this transition is called reverse transition). In order to prevent such reverse transition, in a liquid crystal display device using an OCB mode liquid crystal display element, driving called reverse transition prevention driving is performed.

  That is, in the case of a normally white mode liquid crystal display device that performs white display when a relatively low voltage is applied and displays black when a relatively high voltage is applied, reverse transition prevention drive is In this drive, reverse transition is prevented by applying a voltage corresponding to black separately from the video signal periodically displayed on each pixel. In the reverse transition prevention drive, in order to prevent reverse transition, an operation of applying a voltage corresponding to black to a pixel and an operation of applying a voltage corresponding to a video signal are alternately performed. There is a prevention drive. Therefore, in a liquid crystal display device using an OCB mode liquid crystal display element, a period corresponding to one frame (or one field) of video is reversed from a display period in which a voltage corresponding to the video signal is applied to the pixels. There is provided a black insertion period in which a voltage corresponding to black is applied to the pixels to prevent transfer.

  FIG. 12 shows a system configuration diagram of a liquid crystal television 100 in which a liquid crystal display device using a conventional OCB mode liquid crystal display element is incorporated. A liquid crystal display device including a liquid crystal display panel 101, a backlight unit 102, and a panel substrate 103 is incorporated in a housing 107 of the liquid crystal television 100.

  The backlight unit 102 disposed on the back surface of the liquid crystal display panel 101 has a plurality of cold cathode tubes 108. A panel substrate 103 is disposed on the back surface of the backlight unit 102, and a temperature sensor 104 is disposed on the panel substrate 103. Circuits for controlling the liquid crystal display panel 101 and the backlight unit 102 such as source drivers and gate drivers are mounted on the panel substrate 103.

  Further, a set substrate 106 on which a circuit such as a TV tuner for controlling the liquid crystal television 100 is mounted is disposed on the back side of the housing 107 as shown in FIG.

  FIG. 13 shows a block diagram of a liquid crystal display device incorporated in the liquid crystal television 100 shown in FIG. 12 (see, for example, Patent Document 1).

  In addition to the temperature sensor 104, the panel substrate 103 of the liquid crystal display device includes a temperature detection unit 111, a panel temperature calculation unit 112, a black insertion rate setting unit 113, and a drive processing unit 114.

  The liquid crystal display panel 101 is a liquid crystal display panel using an OCB mode liquid crystal display element.

  The backlight unit 102 is a device that illuminates the liquid crystal display panel 101, and includes a cold cathode tube 108, for example.

  The temperature sensor 104 is a means for detecting the temperature of the installed position and outputting a signal such as a current corresponding to the temperature.

  The temperature detection unit 111 is a unit that detects the detected temperature based on a signal output from the temperature sensor 104.

  The panel temperature calculation means 112 has a correlation information table 115 indicating the correlation between the temperature detected by the temperature sensor 104 and the temperature of the liquid crystal display panel 101. Using this correlation information table 115, This is means for calculating the temperature of the liquid crystal display panel 101 from the temperature detected by the temperature sensor 104 notified from the temperature detection means 111.

  The black insertion rate setting unit 113 is a unit that sets the ratio of the black insertion period according to the temperature of the liquid crystal display panel 101 calculated by the panel temperature calculation unit 112.

  The drive processing unit 114 is a unit that drives the liquid crystal display panel 101 and the backlight unit 102 so as to display at the ratio of the black insertion period set by the black insertion rate setting unit 113.

  FIG. 14 shows a detailed configuration of the drive processing unit 114, the backlight unit 102, and the liquid crystal display panel 101 in the liquid crystal display device.

  Here, the gate driver 127 and the source driver 126 shown in FIG. 14 are included in the drive processing means 114 shown in FIG. 13, and the liquid crystal display panel 101 shown in FIG. 14 corresponds to the liquid crystal display panel 101 shown in FIG. ing.

  The liquid crystal display panel 101 is a TFT (Thin Film Transistor) type display panel. The liquid crystal display panel 101 has a counter substrate (not shown) having a common electrode (not shown) formed on the inner surface, and a pixel electrode 122, a scanning line 123, a signal line 124, and a switching element 125 formed on the inner surface. A TFT substrate (not shown) is disposed so as to face the liquid crystal layer. The scanning lines 123 and the signal lines 124 are arranged in a matrix on the TFT substrate, and a pixel electrode 122 and a switching element 125 are formed for each pixel defined by the scanning lines 123 and the signal lines 124. ing. Each scanning line 123 is connected to the gate driver 127, and each signal line 124 is connected to the source driver 126. A backlight unit 102 is provided on the back surface of the liquid crystal display panel 101.

  Next, the operation of a conventional liquid crystal display device incorporated in such a liquid crystal television 100 will be described.

  When the power supply of the liquid crystal display device is turned on, the liquid crystal layer of the liquid crystal display panel 101 remains in the spray state 93 as shown in FIG. 11C, so that the bend state 94a in FIG. It is also necessary to shift to the bend state 94b of FIG. Therefore, when the power supply of the liquid crystal display device is turned on, the liquid crystal display device performs transfer driving in order to change the liquid crystal layer from the splay state to the bend state. That is, the source driver 126 of the drive processing unit 114 is configured such that the voltage between the pixel electrode 122 and the common electrode is higher than the voltage for displaying an image of 20 to 25 volts for a predetermined time. A voltage of 20 to 25 volts is applied to the signal line 124 as a voltage for transfer driving. Accordingly, since a voltage for driving the transition is applied to the liquid crystal layer for a predetermined time, the liquid crystal layer of the liquid crystal display panel 101 transitions from the splay state to the bend state, and the display operation of this liquid crystal display device is possible. It becomes.

  When the transfer driving is completed as described above and the display operation is enabled, the liquid crystal display device starts the display operation.

  When the liquid crystal display device performs a display operation, the drive processing unit 114 sends control signals to the gate driver 127 and the source driver 126, respectively, in accordance with a video signal input from the outside. As a result, the gate driver 127 applies a scanning signal voltage to the scanning line 123 to sequentially turn on the switching elements 125 of the respective pixels.

  During the display period, the source driver 126 applies a voltage corresponding to the video signal to the pixel electrode 122 of each pixel through the signal line 124 in accordance with the timing at which the gate driver 127 applies the scanning signal voltage to the scanning line 123. Thereby, the liquid crystal molecules 92 of the liquid crystal display panel 101 are modulated, and the transmittance of light emitted from the backlight unit 102 changes. As a result, an image corresponding to the video signal appears in the eyes of the user.

  In addition, during the black insertion period, the source driver 126 applies a voltage corresponding to black to the pixel electrode 122 of each pixel through the signal line 124 in accordance with the timing when the gate driver 127 applies the scanning signal voltage to the scanning line 123. To do. Thereby, the liquid crystal molecules 92 of the liquid crystal display panel 101 are modulated, and the transmittance of light emitted from the backlight unit 102 changes. As a result, a black image appears in the user's eyes.

  FIG. 15 is a timing chart showing an example of the operation of the conventional liquid crystal display device. (A) is a voltage applied to each scanning line 123, and shows the scanning timing for each scanning line 123. FIG. Further, (b) shows a change in the voltage applied to the pixel electrode 122 via each signal line 124. Further, (c) shows the brightness with which the backlight unit 102 illuminates the liquid crystal display panel 101. In FIG. 15, N indicates the number of scanning lines 123 that the liquid crystal display panel 101 has. T1 represents one frame period (or one field period). T2 represents a display period in which a video signal voltage is applied to the pixel electrode 122, and T3 represents a black insertion period in which a voltage corresponding to black is applied to the pixel electrode 122.

  As shown in FIG. 15, one frame period T1 is composed of a display period T2 and a black insertion period T3. Then, as shown in FIG. 15A, all the scanning lines 123 are sequentially scanned in each of the display period T2 and the black insertion period T3. Further, since the liquid crystal display panel 101 is driven by dot inversion, as shown in FIG. 15B, the voltage polarity of the signal to be written is inverted for each dot in each of the display period T2 and the black insertion period T3. As described above, the voltage applied to the pixel electrode 122 changes.

  Further, as shown in FIG. 15C, the backlight unit 102 is alternately turned on and off alternately under the control of the drive processing unit 114. That is, the drive processing unit 114 adjusts the ratio of turning on and off of the backlight unit 102 using PWM (Pulse Wave Modulation) control, so that the brightness when the backlight unit 102 illuminates the liquid crystal display panel 101 is adjusted. To control.

  On the other hand, the temperature sensor 104 detects the temperature of the position on the panel substrate 103 where the temperature sensor 104 is installed, and outputs a signal such as a current corresponding to the detected temperature. The temperature detection unit 111 detects the temperature detected by the temperature sensor 104 based on the signal output from the temperature sensor 104. Then, the temperature detected by the temperature detection unit 111 is passed to the panel temperature calculation unit 112.

  The panel temperature calculation unit 112 calculates the temperature of the liquid crystal display panel 101 from the temperature detected by the temperature detection unit 111.

  FIG. 16 is a diagram illustrating changes over time in the surface temperature of the liquid crystal display panel 101 and the temperature detected by the temperature sensor 104 after the liquid crystal display device is activated at an outside air temperature of −20 ° C. “Panel temperature” shown in FIG. 16 indicates the surface temperature of the liquid crystal display panel 101, and “Temperature detection (sensor) temperature” indicates the temperature detected by the temperature sensor 104.

  As can be seen from FIG. 16, the temperature sensor 104 detects a temperature with a small difference from the temperature of the liquid crystal display panel 101 at the start of display from a low temperature state immediately after the liquid crystal display device is activated. As the temperature rises, a temperature having a large difference from the temperature of the liquid crystal display panel 101 is detected. This is because after the liquid crystal display device is activated, it is affected by heat radiation from the backlight unit 102, the panel substrate 103, the set substrate 106, and the like, where the temperature rises.

  Therefore, in order to obtain the accurate temperature of the liquid crystal display panel 101 from the temperature detected by the temperature sensor 104, it is necessary to consider the influence from the heat source such as the backlight unit 102, the panel substrate 103, and the set substrate 106.

  In order to consider the influence from these heat sources, the panel temperature calculation unit 112 prepares a correlation information table 115 having correlation information as shown in FIG. Utilizing this, the temperature of the liquid crystal display panel 101 is calculated from the temperature detected by the temperature sensor 104.

  Then, the temperature of the liquid crystal display panel 101 calculated by the panel temperature calculation unit 112 is sent to the black insertion rate setting unit 113.

  The black insertion rate setting unit 113 sets the ratio of the black insertion period using a table showing the relationship between the temperature of the liquid crystal display panel 101 and the ratio of the black insertion period as shown in FIG. The black insertion rate setting means 113 obtains the ratio of the black insertion period corresponding to the temperature of the liquid crystal display panel 101 calculated by the panel temperature calculation means 112 based on the table showing the relationship of FIG.

  In the liquid crystal display device, when the temperature is high, the liquid crystal molecules easily move, so that the reverse transition from the bend alignment to the splay alignment is likely to occur. FIG. 17 shows the temperature near the surface of the liquid crystal display panel 101 and an appropriate black insertion rate in order to specify the black insertion rate that can prevent the reverse transition and stably maintain the bend alignment. It is a figure which shows the relationship between the surface temperature of the liquid crystal display panel 101 and the black insertion rate which were calculated | required by examining previously the relationship.

  Then, the drive processing unit 114 controls the driving of the liquid crystal display panel 101 so that black for preventing reverse transition is displayed at the ratio of the black insertion period obtained by the black insertion rate setting unit 113.

In this manner, the required black insertion period ratio is obtained according to the temperature of the liquid crystal display panel 101, and the display of the liquid crystal display panel 101 is controlled to prevent the occurrence of reverse transition of the OCB mode liquid crystal.
JP 2003-295156 A

  However, in the conventional method of obtaining the temperature of the liquid crystal display panel 101 from the temperature detected by the temperature sensor 104 using the correlation as shown in FIG. 16, an electronic device such as the liquid crystal television 100 incorporating the liquid crystal display device is used. Since the ambient temperature where the apparatus is installed is not taken into consideration, the temperature of the liquid crystal display panel 101 cannot be obtained with high accuracy.

  That is, if the ambient temperature (outside air temperature) is different, the temperature of the liquid crystal display panel 101 at that time differs from the same temperature detected by the temperature sensor 104. In addition, the temperature of the liquid crystal display panel 101 cannot be obtained.

  FIG. 18 is a diagram showing changes with time of the surface temperature of the liquid crystal display panel 101 and the temperature detected by the temperature sensor 104 after the liquid crystal display device is activated, for each of different outside air temperatures. The outside air temperature is shown for each of −20 ° C., 0 ° C., and 20 ° C., the solid line indicates the temperature detected by the temperature sensor 104, and the broken line indicates the surface temperature of the liquid crystal display panel 101 actually measured. Show.

  From FIG. 18, the relative relationship between the temperature detected by the temperature sensor 104 and the surface temperature of the liquid crystal display panel 101 is almost the same even at different outside air temperatures, but at the same temperature detected by the temperature sensor 104. It can be seen that the surface temperature of the liquid crystal display panel 101 differs depending on the outside air temperature.

  For example, the surface temperature of the liquid crystal display panel 101 when the temperature detected by the temperature sensor 104 is 40 ° C. is 25 ° C. when the outside air temperature is −20 ° C., 28 ° C. when the outside air temperature is 0 ° C., and 20 ° C. It is 33 ° C when it is ° C, and it can be seen that it varies depending on the outside air temperature.

  Accordingly, in the conventional liquid crystal display device, when the temperature of the liquid crystal display panel 101 is obtained from the temperature detected by the temperature sensor 104 using the correlation information table 115 as shown in FIG. 16, the correlation information table 115 used. The temperature of the liquid crystal display panel 101 obtained using this correlation information table 115 is higher than the outside air temperature (for example, 20 ° C.) higher than the outside air temperature assumed in (1), for example, 0 ° C. The temperature lower than the actual surface temperature of the liquid crystal display panel 101 at that time is required. When the outside air temperature is lower than the assumed outside air temperature (for example, −20 ° C.), this correlation information is obtained. The temperature of the liquid crystal display panel 101 obtained using the table 115 is higher than the actual surface temperature of the liquid crystal display panel 101 at that time. It will be used.

  As described above, in the case where the outside air temperature is higher than the outside air temperature assumed in the correlation information table 115 used when the temperature of the liquid crystal display panel 101 is obtained from the temperature detected by the temperature sensor 104, the correlation information. The ratio of the black insertion period determined based on the temperature of the liquid crystal display panel 101 obtained from the table 115 is smaller than the ratio of the required black insertion period to the actual temperature of the liquid crystal display panel 101. End up. Therefore, in this case, reverse transition of the OCB mode liquid crystal occurs.

  The temperature sensor 104 only needs to be able to directly detect the surface temperature of the liquid crystal display panel 101, but cannot be attached to the surface of the liquid crystal display panel 101 because of its structure. A configuration for estimating the temperature of 101 has to be made.

  On the other hand, since the characteristics of the OCB mode liquid crystal are more greatly affected by temperature than the TN alignment liquid crystal, in the liquid crystal display device using the OCB mode liquid crystal display element, it is necessary to obtain the temperature of the liquid crystal display panel 101 more accurately. .

  The present invention solves the above-described conventional problems, and an object thereof is to provide a liquid crystal display device, an electronic device, a method for manufacturing the electronic device, and the like that can estimate the temperature of the liquid crystal display panel more accurately.

In order to solve the above-described problem, the first aspect of the present invention provides:
A liquid crystal display panel having signal lines and scanning lines arranged in a matrix, and a liquid crystal display element using an OCB mode liquid crystal provided at an intersection of the signal lines and the scanning lines;
A backlight unit that is disposed on the back surface of the liquid crystal display panel and illuminates the liquid crystal display panel;
A first temperature sensor disposed at a predetermined position to detect the temperature of the liquid crystal display panel;
A second temperature sensor for detecting the outside air temperature;
A source driver for supplying a voltage to the signal line; a gate driver for supplying a gate signal to the scanning line; a panel temperature estimating means for estimating a temperature of the liquid crystal display panel; and the panel temperature estimating means estimating the temperature A panel control circuit having a panel control means for controlling the source driver, the gate driver, and the backlight unit based on the temperature of the liquid crystal display panel,
The panel temperature estimation means has a plurality of correlation information between the temperature detected by the first temperature sensor and the temperature of the liquid crystal display panel in advance corresponding to a plurality of types of outside temperatures, Correlation information to be applied is selected from the plurality of correlation information based on outside air temperature information obtained from the second temperature sensor, and detected by the first temperature sensor using the selected correlation information The liquid crystal display device estimates the temperature of the liquid crystal display panel from the measured temperature.

The second aspect of the present invention
A liquid crystal display panel having signal lines and scanning lines arranged in a matrix, and a liquid crystal display element using an OCB mode liquid crystal provided at an intersection of the signal lines and the scanning lines;
A backlight unit that is disposed on the back surface of the liquid crystal display panel and illuminates the liquid crystal display panel;
A first temperature sensor disposed at a predetermined position to detect the temperature of the liquid crystal display panel;
A second temperature sensor for detecting the outside air temperature;
A source driver for supplying a voltage to the signal line; a gate driver for supplying a gate signal to the scanning line; a panel temperature estimating means for estimating a temperature of the liquid crystal display panel; and the panel temperature estimating means estimating the temperature A panel control circuit having a panel control means for controlling the source driver, the gate driver, and the backlight unit based on the temperature of the liquid crystal display panel,
The panel temperature estimation means includes correlation information between the temperature detected by the first temperature sensor and the temperature of the liquid crystal display panel at a predetermined outside air temperature, and the outside air temperature obtained from the second temperature sensor. It has a rule for correcting the correlation information corresponding to the outside temperature according to information, and the correlation information is corrected based on the rule from the outside temperature information, and the corrected correlation In the liquid crystal display device, the temperature of the liquid crystal display panel is estimated from the temperature detected by the first temperature sensor using relationship information.

The third aspect of the present invention
The second temperature sensor is arranged at a position where the outside air temperature can be detected without being affected by other heat sources,
The panel temperature estimation means is the liquid crystal display device according to the first or second aspect of the present invention, wherein the temperature detected by the second temperature sensor is used as the outside air temperature information.

The fourth aspect of the present invention is
An electronic device incorporating the liquid crystal display device of the first or second aspect of the present invention,
The second temperature sensor is an electronic device attached to the outside of the housing.

The fifth aspect of the present invention provides
An electronic device comprising a set substrate on which a circuit for controlling the electronic device is mounted, and incorporating the liquid crystal display device of the first or second aspect of the present invention,
The second temperature sensor is disposed on the set substrate,
The outside air temperature signal output from the second temperature sensor is output to the circuit of the set board,
The circuit of the set board inputs the outside air temperature signal as the outside air temperature information to the panel temperature estimating means,
The panel temperature estimation means has a correction coefficient that can estimate the outside air temperature from the inputted outside air temperature information in consideration of the temperature influence from the set substrate to the second temperature sensor, The electronic device estimates an outside air temperature from the outside air temperature information using a correction coefficient, and estimates the temperature of the liquid crystal display panel based on the estimated outside air temperature.

The sixth aspect of the present invention provides
An electronic device comprising a set substrate on which a circuit for controlling the electronic device is mounted, and incorporating the liquid crystal display device of the first or second aspect of the present invention,
The second temperature sensor is disposed on the set substrate,
The set board has a correction coefficient that can estimate the outside air temperature by correcting the outside air temperature signal output from the second temperature sensor in consideration of the temperature influence from the set board to the second temperature sensor. The outside air temperature signal output from the second temperature sensor is corrected using the correction coefficient, and the corrected outside air temperature signal is input to the panel temperature estimating unit as the outside air temperature information. Is an electronic device.

The seventh aspect of the present invention
An electronic device comprising a set substrate on which a circuit for controlling the electronic device is mounted and incorporating the liquid crystal display device of the second aspect of the present invention,
The second temperature sensor is disposed on the set substrate,
The set substrate has offset amount determination means for determining an offset amount for correcting the correlation information from the temperature detected by the second temperature sensor to correlation information corresponding to the detected temperature. The electronic device inputs the determined offset amount as the outside air temperature information to the panel temperature estimating means.

In addition, the eighth aspect of the present invention
A liquid crystal display panel having signal lines and scanning lines arranged in a matrix, and a liquid crystal display element using an OCB mode liquid crystal provided at an intersection of the signal lines and the scanning lines;
A backlight unit that is disposed on the back surface of the liquid crystal display panel and illuminates the liquid crystal display panel;
A first temperature sensor disposed at a predetermined position for detecting the temperature of the liquid crystal display panel;
A source driver for supplying a voltage to the signal line; a gate driver for supplying a gate signal to the scanning line; and a panel temperature for estimating the temperature of the liquid crystal display panel based on the temperature detected by the first temperature sensor. A panel control circuit comprising: estimation means; and panel control means for controlling the source driver, the gate driver, and the backlight unit based on the temperature of the liquid crystal display panel estimated by the panel temperature estimation means; An electronic device incorporating a liquid crystal display device comprising:
The panel temperature estimation means includes correlation information storage means for previously storing correlation information between the temperature detected by the first temperature sensor and the temperature of the liquid crystal display panel,
The correlation information stored in advance indicates the correlation between the temperature detected by the first temperature sensor and the temperature of the liquid crystal display panel by operating in an environment of a specific specific outside air temperature. It is an electronic device that has been acquired.

The ninth aspect of the present invention provides
A liquid crystal display panel having signal lines and scanning lines arranged in a matrix, and a liquid crystal display element using an OCB mode liquid crystal provided at an intersection of the signal lines and the scanning lines;
A backlight unit that is disposed on the back surface of the liquid crystal display panel and illuminates the liquid crystal display panel;
A first temperature sensor for detecting the temperature of the liquid crystal display panel;
A source driver for supplying a voltage to the signal line; a gate driver for supplying a gate signal to the scanning line; and a panel temperature for estimating the temperature of the liquid crystal display panel based on the temperature detected by the first temperature sensor. A panel control circuit comprising: estimation means; and panel control means for controlling the source driver, the gate driver, and the backlight unit based on the temperature of the liquid crystal display panel estimated by the panel temperature estimation means; A method of manufacturing an electronic device including a set substrate on which a circuit for controlling the electronic device is mounted,
An assembly step of incorporating the first temperature sensor between the panel control circuit and the set substrate;
After assembling, the correlation is performed by operating in an environment of a specific expected outside air temperature and acquiring correlation information indicating a correlation between the temperature detected by the first temperature sensor and the temperature of the liquid crystal display panel. A relationship information acquisition step;
Correlation in which the panel temperature estimation means stores in advance the correlation information for use in estimating the temperature of the liquid crystal display panel based on the temperature detected by the first temperature sensor. An information device manufacturing method comprising an information storage step.

The tenth aspect of the present invention is
In the liquid crystal display device of the first or second aspect of the present invention, based on the panel temperature estimation means for estimating the temperature of the liquid crystal display panel and / or the temperature of the liquid crystal display panel estimated by the panel temperature estimation means. A program for causing a computer to function as the source driver, the gate driver, and the panel control means for controlling the backlight unit.

The eleventh aspect of the present invention is
A recording medium on which a program of the tenth aspect of the present invention is recorded, which is a recording medium that can be processed by a computer.

  According to the present invention, it is possible to provide a liquid crystal display device, an electronic device, a manufacturing method of the electronic device, and the like that can estimate the temperature of the liquid crystal display panel more accurately.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(Embodiment 1)
FIG. 1 shows a system configuration diagram of a liquid crystal television in which the liquid crystal display device according to the first embodiment of the present invention is incorporated. Note that the liquid crystal television 10 of the first embodiment described here corresponds to an example of the electronic apparatus of the present invention.

  A liquid crystal display device including a liquid crystal display panel 11, a backlight unit 12, and a panel substrate 13 is incorporated in the casing 17 of the liquid crystal television 10 of the first embodiment.

  The backlight unit 12 disposed on the back surface of the liquid crystal display panel 11 has a plurality of cold cathode tubes 18. A panel substrate 13 is disposed on the back surface of the backlight unit 12, and a first temperature sensor 14 is disposed on the panel substrate 13. Circuits for controlling the liquid crystal display panel 11 and the backlight unit 12 such as source drivers and gate drivers are mounted on the panel substrate 13.

  Further, as shown in FIG. 1, a set substrate 16 on which a circuit such as a TV tuner for controlling the liquid crystal television 10 is mounted is disposed on the back side of the housing 17, and the second temperature sensor 15 is It is attached to the outside of the back surface of the housing 17. The second temperature sensor 15 is connected to the panel substrate 13 by a cable.

  FIG. 2 is a block diagram of a liquid crystal display device incorporated in the liquid crystal television 10 of the first embodiment shown in FIG.

  In addition to the first temperature sensor 14, the panel substrate 13 of the liquid crystal display device includes a temperature detection means 21, an outside air temperature detection means 22, a panel temperature estimation means 23, a black insertion rate setting means 24, a drive processing means 25, an outside A correlation information table 26 for each temperature is provided.

  The liquid crystal display panel 11 is a liquid crystal display panel using an OCB mode liquid crystal display element.

  The backlight unit 12 is a device that illuminates the liquid crystal display panel 11 and includes a cold cathode tube 18 and the like.

  The first temperature sensor 14 is a temperature sensor provided for acquiring the temperature of the liquid crystal display panel 11, and a signal such as a current corresponding to the temperature at the position where the first temperature sensor 14 is installed. Is a means for outputting.

  The second temperature sensor 15 is means for detecting the ambient temperature (outside air temperature) where the liquid crystal television 10 is installed and outputting a signal such as a current corresponding to the detected outside air temperature.

  The temperature detection means 21 is a means for detecting the temperature detected by the first temperature sensor 14 based on the signal output from the first temperature sensor 14.

  The outside air temperature detecting means 22 is a means for detecting the outside air temperature detected by the second temperature sensor 15 based on the signal output from the second temperature sensor 15.

  The correlation information table 26 for each outside air temperature is a plurality of tables indicating the correlation between the temperature detected by the first temperature sensor 14 and the temperature of the liquid crystal display panel 11 in each of a plurality of outside air temperatures, and is stored in advance. It is what has been.

  The panel temperature estimating means 23 uses the outside air temperature correlation information table 26 to notify the temperature detected by the first temperature sensor 14 notified from the temperature detecting means 21 and the outside air temperature detecting means 22. This is means for estimating and obtaining the temperature of the liquid crystal display panel 11 from the outside air temperature detected by the second temperature sensor 15.

  The black insertion rate setting unit 24 is a unit that sets the ratio of the black insertion period according to the temperature of the liquid crystal display panel 11 obtained by the panel temperature estimation unit 23.

  The drive processing unit 25 is configured to display the video signal and the black data to be inserted on the liquid crystal display panel 11 at the ratio of the black insertion period set by the black insertion rate setting unit 24. 11 and means for driving the backlight unit 12.

  The panel substrate 13 corresponds to an example of the panel control circuit of the present invention, and the drive processing means 25 corresponds to an example of the panel control means of the present invention.

  Next, the operation of the liquid crystal display device incorporated in the liquid crystal television 10 of the first embodiment will be described.

  The liquid crystal display device according to the first embodiment performs transition driving for transitioning the liquid crystal layer of the liquid crystal display panel 11 from the splay state to the bend state when the power is turned on. Similar to the conventional liquid crystal display device, the voltage between the pixel electrode and the common electrode of the liquid crystal display panel 11 is set to a voltage higher than the voltage for displaying an image of 20 to 25 volts for a predetermined time. The source driver of the drive processing means 25 applies a voltage of 20 to 25 volts to the signal line. Since the voltage for transfer driving is applied to the liquid crystal layer of the liquid crystal display panel 11 for a predetermined time, the liquid crystal layer of the liquid crystal display panel 11 changes from the splay state to the bend state. The display operation of the liquid crystal display device becomes possible. When the transfer driving is completed and the display operation is enabled, the liquid crystal display device of the first embodiment starts the display operation.

  The first temperature sensor 14 detects the temperature of the position on the panel substrate 13 where the first temperature sensor 14 is installed, and outputs a signal such as a current corresponding to the detected temperature. The temperature detection means 21 detects the temperature detected by the first temperature sensor 14 based on the signal output from the first temperature sensor 14. Then, the detected temperature information is passed to the panel temperature estimating means 23.

  The second temperature sensor 15 detects the outside air temperature and inputs a signal such as a current corresponding to the detected outside air temperature to the panel substrate 13. The outside air temperature detection means 22 detects the outside air temperature detected by the second temperature sensor 15 based on the signal input from the second temperature sensor 15. Then, the detected outside air temperature information is passed to the panel temperature estimating means 23.

  The panel temperature estimating means 23 selects a correlation information table corresponding to the outside air temperature received from the outside air temperature detecting means 22 from the outside air temperature correlation information table 26. Then, using the selected correlation information table, the temperature of the liquid crystal display panel 11 is obtained from the temperature detected by the first temperature sensor 14.

  The correlation information table 26 for each outside air temperature includes a plurality of correlation information tables indicating the correlation between the temperature detected by the first temperature sensor 14 and the temperature of the liquid crystal display panel 11 as shown in FIG. There are several for each temperature. For example, when the outside air temperature is 20 ° C., the panel temperature estimating means 23 selects and uses the correlation information table for the outside air temperature 20 ° C. from the correlation information table 26 for each outside air temperature, and the outside air temperature is 30 ° C. In this case, the correlation information table for the outside air temperature of 30 ° C. is selected and used.

  Then, the temperature of the liquid crystal display panel 11 obtained by the panel temperature estimating means 23 is sent to the black insertion rate setting means 24.

  The black insertion rate setting means 24 uses the table showing the relationship between the temperature of the liquid crystal display panel 11 and the ratio of the black insertion period as shown in FIG. 17 to obtain the liquid crystal display panel 11 obtained by the panel temperature estimation means 23. The ratio of the black insertion period is obtained from the temperature of.

  Then, similarly to the conventional liquid crystal display device, the drive processing means 25 displays black data to be inserted to prevent reverse transition at the ratio of the black insertion period determined by the black insertion rate setting means 24. The driving of the liquid crystal display panel 11 is controlled to display a video signal on the liquid crystal display panel 11.

  That is, as shown in FIG. 15, the drive processing means 25 changes T1 (one frame period or one field period) to T2 (display period) so that the black insertion period ratio obtained by the black insertion rate setting means 24 is obtained. ) And T3 (black insertion period), the source driver so that an image corresponding to the video signal is displayed in the user's eye during the display period, and a black image is displayed in the user's eye during the black insertion period. , Controls the gate driver and the backlight unit 102.

  In the liquid crystal display device according to the first embodiment, the panel temperature estimation unit 23 selects and uses a table corresponding to the ambient temperature at that time from the correlation information table 26 for each ambient temperature. Even if it changes, the temperature of the liquid crystal display panel 11 can be estimated more accurately.

  In the first embodiment, the second temperature sensor 15 is attached to the outside of the back surface of the housing 17. However, the second temperature sensor 15 is a position where the outside air temperature can be detected with little influence of temperature from other heat sources. Any other place may be used.

  In addition, the type of the outside air temperature in the correlation information table prepared in the correlation information table 26 for each outside air temperature may be set in consideration of the usage status of the electronic device in which the liquid crystal display device according to the first embodiment is incorporated. . For example, when used in a wide temperature range from a very low temperature to a very high temperature, such as a car navigation system, from the table corresponding to the assumed very low outside temperature, It is good to have a table corresponding to the outside temperature, and in the case of an LCD TV that is supposed to be used indoors, there is a lower limit and an upper limit on the type of outside temperature of the table to be prepared. A plurality of tables in which the temperature range is narrowed and the temperature range is finely divided may be prepared.

  Further, in the first embodiment, as the correlation information of the present invention, a correlation indicating a correlation between the temperature detected by the first temperature sensor 14 and the temperature of the liquid crystal display panel 11 as shown in FIG. Although the information table is used, it may be a function or formula for each outside air temperature that can calculate the temperature of the liquid crystal display panel 11 from the temperature detected by the first temperature sensor 14. In that case, instead of the correlation information table 26 for each outside air temperature, a plurality of functions and equations for each outside air temperature are stored in advance, and the panel temperature estimating means 23 uses the functions and equations used according to the outside air temperature. And the temperature of the liquid crystal display panel 11 may be calculated from the temperature detected by the first temperature sensor 14 using the selected function or mathematical expression.

(Embodiment 2)
The system configuration of a liquid crystal television incorporating the liquid crystal display device according to the second embodiment of the present invention is the same as that of the first embodiment and is as shown in FIG.

  In the liquid crystal display device of the second embodiment, the configuration of the panel substrate 13 is different from that of the first embodiment.

  FIG. 3 shows a block diagram of a liquid crystal display device incorporated in the liquid crystal television 10 of the second embodiment. The same reference numerals are used for the same components as in the first embodiment shown in FIG.

  Hereinafter, a different part from Embodiment 1 is demonstrated.

  In the first embodiment, a correlation information table indicating the correlation between the temperature detected by the first temperature sensor 14 and the temperature of the liquid crystal display panel 11 is included in the correlation information table 26 for each outside air temperature. The correlation reference information table 28 according to the second embodiment has only one correlation information table for one type of outside air temperature as a reference.

  The panel temperature estimation unit 27 according to the second embodiment uses the correlation reference information table 28 according to the outside air temperature information received from the outside air temperature detecting unit 22 to calculate only the difference between the detected outside air temperature and the reference outside air temperature. Using the shifted correlation reference information table 28, the temperature of the liquid crystal display panel 11 is estimated and obtained from the temperature detected by the first temperature sensor 14.

  As shown in FIG. 18, the relative relationship between the temperature detected by the first temperature sensor 14 and the actual temperature of the liquid crystal display panel 11 is substantially the same even when the outside air temperature changes. The second embodiment uses this relationship.

  For example, when the temperature detected by the first temperature sensor 14 and the actual temperature of the liquid crystal display panel 11 have a relationship as shown in FIG. 18, the reference outside air temperature is set to 0 ° C., and the correlation reference information table 28 Prepare a table at an outside temperature of 0 ° C. When the outside air temperature detected by the second temperature sensor 15 received from the outside air temperature detecting means 22 is 20 ° C., the panel temperature estimating means 27 shifts the correlation information in the correlation reference information table 28 by + 20 ° C. The temperature of the liquid crystal display panel 11 is obtained from the temperature detected by the first temperature sensor 14 using the correlation information shifted by + 20 ° C. When the outside air temperature detected by the second temperature sensor 15 received from the outside air temperature detecting unit 22 is −20 ° C., the panel temperature estimating unit 27 sets the correlation information in the correlation reference information table 28 to −20. The temperature of the liquid crystal display panel 11 is obtained from the temperature detected by the first temperature sensor 14 using the correlation information shifted by -20 ° C. and shifted by −20 ° C.

  In this case, the correlation information in the correlation reference information table 28 is shifted according to the outside air temperature detected by the second temperature sensor 15, so that the correlation information according to the outside air temperature information of the present invention is changed. This is an example of a rule for correcting to the one corresponding to the outside temperature.

  As described above, the liquid crystal display device according to the second embodiment estimates the temperature of the liquid crystal display panel 11 from the temperature detected by the first temperature sensor 14 in consideration of the outside air temperature at that time. In addition, the temperature of the liquid crystal display panel 11 can be obtained.

  In the second embodiment, the second temperature sensor 15 is attached to the outside of the back surface of the housing 17. However, the second temperature sensor 15 is a position where the influence of the temperature from other heat sources is small and the outside air temperature can be detected. Any other place may be used.

  In addition, the outside air temperature used as a reference for the correlation reference information table 28 is an expected usage situation of an electronic device in which the liquid crystal display device according to the second embodiment is incorporated, and is the most frequently used situation. The temperature is desirable. This is because when the correlation reference information table 28 is used as it is without being shifted, the temperature of the liquid crystal display panel 11 can be obtained most accurately.

  In the second embodiment, as the correlation information of the present invention, the correlation indicating the correlation between the temperature detected by the first temperature sensor 14 and the temperature of the liquid crystal display panel 11 as shown in FIG. Although the reference information table 28 is used, it may be a function that can calculate the temperature of the liquid crystal display panel 11 from the temperature detected by the first temperature sensor 14 and uses the outside air temperature as a parameter. In that case, the function is stored in advance instead of the correlation reference information table 28, and the panel temperature estimating means 23 substitutes a parameter corresponding to the outside air temperature into the function, and uses the function. The temperature of the liquid crystal display panel 11 may be calculated from the temperature detected by the first temperature sensor 14.

(Embodiment 3)
FIG. 4 shows a system configuration diagram of a liquid crystal television in which the liquid crystal display device according to the third embodiment of the present invention is incorporated. The liquid crystal television 30 of the third embodiment described here corresponds to an example of the electronic device of the present invention. In addition, the same code | symbol is used for the same component as the liquid crystal television 10 of Embodiment 1 shown in FIG.

  A liquid crystal display device including the liquid crystal display panel 11, the backlight unit 12, and the panel substrate 31 is incorporated in the casing 17 of the liquid crystal television 30 of the third embodiment.

  The backlight unit 12 disposed on the back surface of the liquid crystal display panel 11 has a plurality of cold cathode tubes 18. The panel substrate 31 is disposed on the back surface of the backlight unit 12, and the first temperature sensor 14 is disposed on the panel substrate 31. Circuits for controlling the liquid crystal display panel 11 and the backlight unit 12 such as source drivers and gate drivers are mounted on the panel substrate 31.

  Further, as shown in FIG. 4, a set substrate 32 on which a circuit such as a TV tuner for controlling the liquid crystal television 30 is mounted is disposed on the back side of the housing 17. Two temperature sensors 33 are arranged. The set substrate 32 is connected to the panel substrate 31 by a cable.

  FIG. 5 shows a block diagram of a liquid crystal display device incorporated in the liquid crystal television 30 of the third embodiment shown in FIG. Note that the same reference numerals are used for the same components as those of the liquid crystal display device of Embodiment 1 shown in FIG.

  In addition to the first temperature sensor 14, the panel substrate 31 of the liquid crystal display device includes a temperature detection means 21, a corrected outside air temperature calculation means 34, a panel temperature estimation means 23, a black insertion rate setting means 24, a drive processing means 25, A correlation information table 26 for each outside air temperature is provided.

  The liquid crystal display panel 11 is a liquid crystal display panel using an OCB mode liquid crystal display element.

  The backlight unit 12 is a device that illuminates the liquid crystal display panel 11 and includes a cold cathode tube 18 and the like.

  The first temperature sensor 14 is a temperature sensor provided for acquiring the temperature of the liquid crystal display panel 11, and a signal such as a current corresponding to the temperature at the position where the first temperature sensor 14 is installed. Is a means for outputting.

  The temperature detection means 21 is a means for detecting the temperature detected by the first temperature sensor 14 based on the signal output from the first temperature sensor 14.

  The second temperature sensor 33 is installed at a position affected by the ambient temperature (outside air temperature) where the liquid crystal television 30 is installed, and the temperature of the position where the second temperature sensor 33 is installed. It is a means for outputting a signal such as a corresponding current. Since the second temperature sensor 33 is disposed on the set substrate 32, it is also affected by the temperature of a heat source such as the set substrate 32.

  The corrected outside air temperature calculating means 34 is a means for estimating and obtaining the outside air temperature based on the signal output from the second temperature sensor 33.

  The correlation information table 26 for each outside air temperature is a plurality of tables indicating the correlation between the temperature detected by the first temperature sensor 14 and the temperature of the liquid crystal display panel 11 in each of a plurality of outside air temperatures, and is stored in advance. It is what has been.

  The panel temperature estimating means 23 uses the outside air temperature correlation information table 26 to notify the temperature detected by the first temperature sensor 14 notified from the temperature detecting means 21 and the corrected outside air temperature calculating means 34. This is a means for estimating and obtaining the temperature of the liquid crystal display panel 11 from the outside air temperature obtained by the corrected outside air temperature calculating means 34.

  The black insertion rate setting unit 24 is a unit that sets the ratio of the black insertion period according to the temperature of the liquid crystal display panel 11 obtained by the panel temperature estimation unit 23.

  The drive processing unit 25 is configured to display the video signal and the black data to be inserted on the liquid crystal display panel 11 at the ratio of the black insertion period set by the black insertion rate setting unit 24. 11 and means for driving the backlight unit 12.

  The panel substrate 31 corresponds to an example of the panel control circuit of the present invention, and the drive processing means 25 corresponds to an example of the panel control means of the present invention.

  Next, the operation of the liquid crystal display device incorporated in the liquid crystal television 30 of the third embodiment will be described.

  The liquid crystal display device according to the third embodiment first performs transition driving for transitioning the liquid crystal layer of the liquid crystal display panel 11 from the splay state to the bend state when the power is turned on.

  The first temperature sensor 14 detects the temperature of the position on the panel substrate 31 where the first temperature sensor 14 is installed, and outputs a signal such as a current corresponding to the detected temperature. The temperature detection means 21 detects the temperature detected by the first temperature sensor 14 based on the signal output from the first temperature sensor 14. Then, the detected temperature information is passed to the panel temperature estimating means 23.

  On the other hand, the second temperature sensor 33 detects the temperature of the position on the set substrate 32 where the second temperature sensor 33 is installed, and outputs a signal such as a current corresponding to the detected temperature.

  Based on the signal input from the second temperature sensor 33, the corrected outside air temperature calculation means 34 estimates and calculates the outside air temperature at that time using the outside air temperature correction coefficient. Then, the obtained outside air temperature information is passed to the panel temperature estimating means 23. The outside air temperature correction coefficient is a correction coefficient for obtaining the outside air temperature from the temperature detected by the second temperature sensor 33 by correcting the influence of the temperature received by the second temperature sensor 33 from the heat source such as the set substrate 32. It is. This outside air temperature correction coefficient is stored in advance in the corrected outside air temperature calculating means 34.

  The panel temperature estimating means 23 selects a correlation information table corresponding to the outside air temperature received from the corrected outside air temperature calculating means 34 from the outside air temperature correlation information table 26. Then, using the selected correlation information table, the temperature of the liquid crystal display panel 11 is obtained from the temperature detected by the first temperature sensor 14.

  The correlation information table 26 for each outside air temperature includes a plurality of correlation information tables indicating the correlation between the temperature detected by the first temperature sensor 14 and the temperature of the liquid crystal display panel 11 as shown in FIG. There are several for each temperature.

  Then, the temperature of the liquid crystal display panel 11 obtained by the panel temperature estimating means 23 is sent to the black insertion rate setting means 24.

  The black insertion rate setting means 24 uses the table showing the relationship between the temperature of the liquid crystal display panel 11 and the ratio of the black insertion period as shown in FIG. 17 to obtain the liquid crystal display panel 11 obtained by the panel temperature estimation means 23. The ratio of the black insertion period is obtained from the temperature of.

  Then, similarly to the conventional liquid crystal display device, the drive processing means 25 displays black data to be inserted to prevent reverse transition at the ratio of the black insertion period determined by the black insertion rate setting means 24. The driving of the liquid crystal display panel 11 is controlled to display a video signal on the liquid crystal display panel 11.

  FIG. 6 shows a block diagram of a liquid crystal display device having another configuration different from that of FIG. 5 incorporated in the liquid crystal television 30 of the third embodiment shown in FIG. Note that the same reference numerals are used for the same components as those of the liquid crystal display device shown in FIG.

  The liquid crystal display device according to the third embodiment shown in FIG. 6 is different from the liquid crystal display device shown in FIG. 5 in that the corrected outside air temperature calculating means is provided on the set substrate 32 side instead of the panel substrate 31 side. Different. That is, the corrected outside air temperature calculating unit 35 is provided on the set substrate 32 instead of the corrected outside air temperature calculating unit 34 in FIG.

  The corrected outside air temperature calculating means 35 shown in FIG. 6 performs the same processing as the corrected outside air temperature calculating means 34 shown in FIG.

  In the liquid crystal display device according to the third embodiment shown in FIG. 6, the corrected outside air temperature calculation means 35 uses the outside air temperature correction coefficient based on the signal input from the second temperature sensor 33 and uses the outside air temperature correction coefficient at that time. Estimate the temperature. Then, the obtained outside air temperature information is transmitted to the panel substrate 31.

  And the panel temperature estimation means 23 selects the correlation information table corresponding to the outside temperature received from the correction outside temperature calculation means 35 from the correlation information table 26 for each outside air temperature, and the selected correlation information table Is used to determine the temperature of the liquid crystal display panel 11 from the temperature detected by the first temperature sensor 14.

  Operations other than those described above are the same as those of the liquid crystal display device according to the third embodiment having the configuration shown in FIG. That is, in the liquid crystal display device having the configuration of FIG. 5, the panel substrate 31 receives the signal output from the second temperature sensor as it is from the set substrate 32, whereas in the liquid crystal display device having the configuration of FIG. Only the point 31 receives the signal of the outside air temperature information from the set substrate 32 is different.

  In any of the liquid crystal display devices according to the third embodiment shown in FIGS. 5 and 6, the panel temperature estimating unit 23 selects a table corresponding to the outside air temperature at that time from the outside air temperature correlation information table 26. Since it is selected and used, the temperature of the liquid crystal display panel 11 can be estimated more accurately even if the outside air temperature changes.

  In the liquid crystal display devices of the first and second embodiments, the second temperature sensor 15 must be disposed at a position where the outside air temperature can be detected, whereas in the liquid crystal display device of the third embodiment, the second temperature sensor 15 is provided. Even if the sensor 33 is a position affected by the temperature of another heat source such as the set substrate 32, the sensor 33 may be disposed anywhere as long as it is affected by the outside air temperature. Therefore, in the third embodiment, the second temperature sensor 33 is described as being disposed on the set substrate 32. However, the second temperature sensor 33 may be disposed at any other position as long as the position is affected by the outside air temperature. .

  In addition, the liquid crystal display device according to the third embodiment has a configuration in which the panel substrate 31 receives information on a temperature sensor used elsewhere, without providing a dedicated temperature sensor as the second temperature sensor 33. You can also For example, when the liquid crystal display device according to the third embodiment is incorporated in a car navigation system, the passenger compartment temperature information used by the car air conditioner may be received and used as the outside air temperature information. .

  The outside air temperature correction coefficient used by the corrected outside air temperature calculating unit may be an outside air temperature from the signal received from the second temperature sensor 33, and may be a correction table, a correction function, or the like. Further, the outside air temperature correction coefficient is determined by measuring and setting for each electronic device in a state where the liquid crystal display device of the third embodiment is incorporated in the electronic device.

(Embodiment 4)
The system configuration of a liquid crystal television incorporating the liquid crystal display device according to the fourth embodiment of the present invention is the same as that of the third embodiment and is as shown in FIG.

  In the liquid crystal display device of the fourth embodiment, the configuration of the panel substrate 31 and the set substrate 32 is different from that of the third embodiment.

  FIG. 7 shows a block diagram of a liquid crystal display device incorporated in the liquid crystal television 30 of the fourth embodiment. The same components as those in the third embodiment shown in FIG.

  Hereinafter, a different part from Embodiment 3 is demonstrated.

  In addition to the second temperature sensor 33, the set substrate 32 according to the fourth embodiment includes a correlation offset amount calculation unit 41.

  In addition, the panel substrate 31 includes a correlation reference information table 28 having only one correlation information table for one type of outside air temperature as a reference. This correlation criterion information table 28 is the same as the correlation criterion information table 28 used in the second embodiment.

  Next, the operation of the liquid crystal display device according to the fourth embodiment will be described with respect to the differences from the third embodiment.

  The second temperature sensor 33 detects the temperature of the position on the set substrate 32 where the second temperature sensor 33 is installed, and outputs a signal such as a current corresponding to the detected temperature.

  The correlation offset amount calculation unit 41 calculates the correlation offset amount based on the signal input from the second temperature sensor 33. Then, the calculated correlation offset amount is transmitted to the panel substrate 31. As the correlation offset amount calculated here, a value obtained by shifting the correlation in the correlation reference information table 28 when the panel temperature estimating means 42 obtains the temperature of the liquid crystal display panel 11 is used. This is the amount by which the correlation in the relationship reference information table 28 is shifted.

  The correlation offset amount calculation means 41 is an example of the offset amount determination means of the present invention, and the correlation offset amount here is used to correct the correlation information corresponding to the detected temperature of the present invention. This is an example of the offset amount.

  Then, the panel temperature estimation unit 42 of the fourth embodiment shifts the correlation reference information table 28 by the amount of the correlation offset received from the correlation offset amount calculation unit 41, and the shifted correlation. Using the reference information table 28, the temperature of the liquid crystal display panel 11 is estimated from the temperature detected by the first temperature sensor 14.

  As shown in FIG. 18, the relative relationship between the temperature detected by the first temperature sensor 14 and the actual temperature of the liquid crystal display panel 11 is substantially the same even when the outside air temperature changes. The fourth embodiment uses this relationship.

  For example, when the temperature detected by the first temperature sensor 14 and the actual temperature of the liquid crystal display panel 11 have a relationship as shown in FIG. 18, the reference outside air temperature is set to 0 ° C., and the correlation reference information table 28 Prepare a table at an outside temperature of 0 ° C. When the outside air temperature detected by the second temperature sensor 33 is 20 ° C., the correlation offset amount calculation means 41 calculates “+ 20 ° C.” as the correlation offset amount and transmits it to the panel temperature estimation means 42. . Further, when the outside air temperature detected by the second temperature sensor 33 is −20 ° C., the correlation offset amount calculating means 41 calculates “−20 ° C.” as the correlation offset amount, and the panel temperature estimating means. 42. Then, the panel temperature estimating unit 42 receives the correlation information in the correlation reference information table 28 from the correlation offset amount calculating unit 41 (in this case, “+ 20 ° C.” or “−20 ° C.”). The temperature of the liquid crystal display panel 11 is obtained from the temperature detected by the first temperature sensor 14 using the correlation information shifted by the minute.

  As described above, the liquid crystal display device according to the fourth embodiment estimates the temperature of the liquid crystal display panel 11 from the temperature detected by the first temperature sensor 14 in consideration of the outside air temperature at that time. In addition, the temperature of the liquid crystal display panel 11 can be obtained.

(Embodiment 5)
FIG. 8 shows a system configuration diagram of a liquid crystal television in which the liquid crystal display device according to the fifth embodiment of the present invention is incorporated. Note that the liquid crystal television 50 of the fifth embodiment described here corresponds to an example of the electronic apparatus of the present invention.

  The liquid crystal display device of the fifth embodiment has the same configuration as the conventional liquid crystal display device. The same components as those of the liquid crystal television 10 of the first embodiment shown in FIG.

  A liquid crystal display device including the liquid crystal display panel 11, the backlight unit 12, and the panel substrate 51 is incorporated in the casing 17 of the liquid crystal television 50 according to the fifth embodiment.

  The backlight unit 12 disposed on the back surface of the liquid crystal display panel 11 has a plurality of cold cathode tubes 18. A panel substrate 51 is disposed on the back surface of the backlight unit 12, and the first temperature sensor 14 is disposed on the panel substrate 51. Circuits for controlling the liquid crystal display panel 11 and the backlight unit 12 such as source drivers and gate drivers are mounted on the panel substrate 51.

  Further, as shown in FIG. 8, a set substrate 16 on which a circuit such as a television tuner for controlling the liquid crystal television 50 is mounted is disposed on the back side of the housing 17.

  FIG. 9 is a block diagram of a liquid crystal display device incorporated in the liquid crystal television 50 of the fifth embodiment shown in FIG. The same reference numerals are used for the same components as those of the liquid crystal display device of the first embodiment shown in FIG.

  In addition to the first temperature sensor 14, the panel substrate 51 of the liquid crystal display device includes a temperature detection unit 21, a panel temperature estimation unit 52, a black insertion rate setting unit 24, a drive processing unit 25, and a correlation information storage unit 53. Is provided.

  The liquid crystal display panel 11 is a liquid crystal display panel using an OCB mode liquid crystal display element.

  The backlight unit 12 is a device that illuminates the liquid crystal display panel 11 and includes a cold cathode tube 18 and the like.

  The first temperature sensor 14 is a temperature sensor provided for acquiring the temperature of the liquid crystal display panel 11, and a signal such as a current corresponding to the temperature at the position where the first temperature sensor 14 is installed. Is a means for outputting.

  The temperature detection means 21 is a means for detecting the temperature detected by the first temperature sensor 14 based on the signal output from the first temperature sensor 14.

  The correlation information storage means 53 stores an applied correlation information table 54. The applied correlation information table 54 is a table showing the correlation between the temperature detected by the first temperature sensor 14 and the temperature of the liquid crystal display panel 11 as shown in FIG. 16, and is stored in advance. Is.

  The panel temperature estimation means 52 uses the applied correlation information table 54 stored in the correlation information storage means 53, and from the temperature detected by the first temperature sensor 14 notified from the temperature detection means 21, This is means for estimating and obtaining the temperature of the liquid crystal display panel 11.

  The black insertion rate setting unit 24 is a unit that sets the ratio of the black insertion period according to the temperature of the liquid crystal display panel 11 obtained by the panel temperature estimation unit 52.

  The drive processing unit 25 is configured to display the video signal and the black data to be inserted on the liquid crystal display panel 11 at the ratio of the black insertion period set by the black insertion rate setting unit 24. 11 and means for driving the backlight unit 12.

  The panel substrate 51 corresponds to an example of the panel control circuit of the present invention, and the drive processing means 25 corresponds to an example of the panel control means of the present invention. The correlation information storage means 53 is an example of the correlation information storage means of the present invention.

  Next, the operation of the liquid crystal display device incorporated in the liquid crystal television 50 of the fifth embodiment will be described.

  The liquid crystal display device according to the fifth embodiment first performs transfer driving for changing the liquid crystal layer of the liquid crystal display panel 11 from the splay state to the bend state when the power is turned on.

  The first temperature sensor 14 detects the temperature of the position on the panel substrate 51 where the first temperature sensor 14 is installed, and outputs a signal such as a current corresponding to the detected temperature. The temperature detection means 21 detects the temperature detected by the first temperature sensor 14 based on the signal output from the first temperature sensor 14. Then, the detected temperature information is passed to the panel temperature estimating means 52.

  The panel temperature estimation means 52 obtains the temperature of the liquid crystal display panel 11 from the temperature detected by the first temperature sensor 14 using the applied correlation information table 54 stored in the correlation information storage means 53.

  Then, the temperature of the liquid crystal display panel 11 obtained by the panel temperature estimating means 52 is sent to the black insertion rate setting means 24.

  The black insertion rate setting means 24 uses the table showing the relationship between the temperature of the liquid crystal display panel 11 and the ratio of the black insertion period as shown in FIG. 17 to obtain the liquid crystal display panel 11 obtained by the panel temperature estimation means 52. The ratio of the black insertion period is obtained from the temperature of.

  Then, the drive processing unit 25 controls the driving of the liquid crystal display panel 11 so that black data to be inserted for preventing reverse transition is displayed at the ratio of the black insertion period obtained by the black insertion rate setting unit 24. Thus, a video signal is displayed on the liquid crystal display panel 11.

  As described above, the configuration and operation of the liquid crystal display device of the fifth embodiment are the same as those of the conventional liquid crystal display device, but are characterized by the method of manufacturing the electronic device incorporating the fifth embodiment. .

  Below, the manufacturing method of the liquid crystal television 50 incorporating the liquid crystal display device of this Embodiment 5 is demonstrated.

  FIG. 10 shows a process flow of the manufacturing method of the liquid crystal television 50 of the fifth embodiment.

  First, the liquid crystal display device 50 according to the fifth embodiment, the set substrate 16 and the like are assembled into the housing 17 to assemble the liquid crystal television 50 (S101).

  Next, a device capable of measuring a temperature such as a thermocouple is attached to the surface of the liquid crystal display panel 11 of the assembled liquid crystal television 50, and the assembled liquid crystal television 50 is placed in a thermostatic bath. Operate with. Here, as a condition that the liquid crystal television 50 will be used most frequently, the temperature in the thermostat is set to 25 ° C. and the liquid crystal television 50 is operated. Then, the temperature change between the temperature detected by the first temperature sensor 14 and the surface temperature of the liquid crystal display panel 11 after the liquid crystal television 50 is turned on is measured (S102).

  Then, an application correlation information table 54 used by the panel temperature estimation means 52 is created from these measured temperature changes, and the application correlation information table 54 is stored in the correlation information storage means 53 (S103).

  In the process of S102, the temperature of 25 ° C. set as a condition that the liquid crystal television 50 is most frequently used is an example of an environment of a specific outside temperature assumed in the present invention. The processing of S101, S102, and S103 corresponds to an example of an assembly step, a correlation information acquisition step, and a correlation information storage step of the present invention, respectively.

  And when this liquid crystal television 50 is used, the panel temperature estimation means 52 uses the applied correlation information table 54 stored at the time of manufacture and uses the temperature detected by the first temperature sensor 14. The temperature of the liquid crystal display panel 11 is obtained.

  When the first temperature sensor 14 provided in the liquid crystal display device is operated only by the liquid crystal display device without being incorporated in the liquid crystal television 50 or the like, the liquid crystal display device such as the panel substrate 51 or the backlight unit 12 is used. Although it is only affected by the temperature of the other parts of the configuration, when it is operated in the state of being incorporated in the liquid crystal television 50, the set substrate 16 serving as a heat source is also arranged near the first temperature sensor 14. Therefore, it is further influenced by other heat sources such as the set substrate 16.

  Therefore, the correlation between the temperature detected by the first temperature sensor 14 and the temperature of the liquid crystal display panel 11 indicates that the liquid crystal display device operates alone or when it is incorporated in another electronic device. And it will be different.

  As in the fifth embodiment, the first temperature sensor is created by creating and storing in advance an application correlation information table 54 based on temperature information measured in a state where the liquid crystal display device is incorporated in an electronic device. From the temperature detected at 14, a more accurate temperature of the liquid crystal display panel 11 can be obtained.

  In the fifth embodiment, the applied correlation information table 54 is created and stored. However, instead of the applied correlation information table 54, the temperature detected by the first temperature sensor 14 is used. An equation capable of calculating the temperature of the liquid crystal display panel 11 is created and stored, and the panel temperature estimation means 52 uses the equation to calculate the liquid crystal display panel from the temperature detected by the first temperature sensor 14. The temperature of 11 may be obtained.

  In each embodiment, the backlight unit is illuminated by a cold cathode tube, but a liquid crystal display device that is illuminated by something other than a cold cathode tube may be used. For example, a backlight unit that illuminates with an LED may be used.

  In addition, the first temperature sensor and the second temperature sensor used in each embodiment may be any sensors that can detect temperature, such as a thermistor and a digital temperature sensor.

  In each embodiment, the first temperature sensor 14 is arranged on the panel substrate. However, the back surface of the backlight unit 12 can be used in any place affected by the temperature of the liquid crystal display panel 11. Etc., and may be arranged anywhere.

  In each embodiment, the liquid crystal television is used as the electronic device incorporating the liquid crystal display device of the present invention. However, the present invention can also be applied to an electronic device other than the liquid crystal television. For example, any electronic device incorporating a liquid crystal display device using an OCB mode liquid crystal element such as a car navigation system, a personal computer, a mobile phone, a game machine, or a PDA can be applied.

  The program of the present invention is the above-described panel temperature estimating means for estimating the temperature of the liquid crystal display panel and / or the liquid crystal display panel estimated by the panel temperature estimating means of the liquid crystal display device of the present invention described above. A program for causing a computer to execute the functions of the source driver, the gate driver, and the panel control means for controlling the backlight unit based on the temperature of the computer, the program operating in cooperation with the computer is there.

  Further, the recording medium of the present invention is the above-described liquid crystal display estimated by the panel temperature estimating means for estimating the temperature of the liquid crystal display panel and / or the panel temperature estimating means of the liquid crystal display device of the present invention described above. A recording medium storing a program for causing a computer to execute the functions of the source driver, the gate driver, and the panel control means for controlling the backlight unit based on the temperature of the panel, and is readable by the computer The read program is a recording medium used in cooperation with the computer.

  Further, one usage form of the program of the present invention may be an aspect in which the program is recorded on a computer-readable recording medium and operates in cooperation with the computer.

  Further, the recording medium includes a ROM and the like.

  The computer of the present invention described above is not limited to pure hardware such as a CPU, and may include firmware, an OS, and peripheral devices.

  As described above, the configuration of the present invention may be realized by software or hardware.

  As described above, by using the liquid crystal display device, the electronic device, and the method for manufacturing the electronic device of the present invention, the ratio of the black insertion period is set based on the accurately obtained temperature of the liquid crystal display panel. Therefore, the ratio of the black insertion period does not become smaller than the required ratio, and the occurrence of reverse transition can be reliably prevented. In addition, since the temperature of the liquid crystal display panel can be accurately estimated, the ratio of the black insertion period to be set can be made as small as possible, and a phenomenon such as a decrease in luminance accompanying black insertion can be suppressed.

  Since the liquid crystal display device, the electronic device, and the manufacturing method of the electronic device according to the present invention can estimate the temperature of the liquid crystal display panel more accurately, the liquid crystal display device using the OCB mode liquid crystal, the electronic device, and the manufacturing method of the electronic device Etc. are useful.

The system block diagram of the liquid crystal television of Embodiment 1 of this invention 1 is a block diagram of a liquid crystal display device incorporated in a liquid crystal television according to Embodiment 1 of the present invention. The block diagram of the liquid crystal display device incorporated in the liquid crystal television of Embodiment 2 of this invention The system block diagram of the liquid crystal television of Embodiment 3 of this invention The block diagram of the liquid crystal display device incorporated in the liquid crystal television of Embodiment 3 of this invention The block diagram of the liquid crystal display device of another structure incorporated in the liquid crystal television of Embodiment 3 of this invention The block diagram of the liquid crystal display device incorporated in the liquid crystal television of Embodiment 4 of this invention The system block diagram of the liquid crystal television of Embodiment 5 of this invention The block diagram of the liquid crystal display device incorporated in the liquid crystal television of Embodiment 5 of this invention The figure which shows the process flow of the manufacturing method of the liquid crystal television of Embodiment 5 of this invention. (A) The figure which shows the bend state in the case of white display of OCB liquid crystal, (b) The figure which shows the bend state in the case of black display of OCB liquid crystal, (c) The figure which shows the splay state of OCB liquid crystal System configuration diagram of conventional LCD TV Block diagram of a liquid crystal display device incorporated in a conventional liquid crystal television The figure which shows the detailed structure of the liquid crystal display panel drive processing means of the conventional liquid crystal display device, a liquid crystal display panel, and a backlight unit. The figure which shows the timing chart which drives the conventional liquid crystal display device The figure which shows the time-dependent change of the liquid crystal display panel and sensor detection temperature after starting the conventional liquid crystal display device The figure which shows the relationship between the surface temperature of the liquid crystal display panel and the appropriate black insertion rate in the liquid crystal display device The figure which shows the time-dependent change of the liquid crystal display panel and sensor detection temperature after starting of the liquid crystal display device in each of different outside air temperatures

Explanation of symbols

10, 30, 50 Liquid crystal television 11 Liquid crystal display panel 12 Backlight unit 13, 31, 51 Panel substrate 14 First temperature sensor 15, 33 Second temperature sensor 16, 32 Set substrate 17 Housing 18 Cold cathode tube 21 Temperature Detection means 22 Outside air temperature detection means 23, 27, 42, 52 Panel temperature estimation means 24 Black insertion rate setting means 25 Drive processing means 26 Correlation information table for each outside air temperature 28 Correlation reference information table 34, 35 Corrected outside air temperature calculation means 41 Correlation offset amount calculation means 53 Correlation information storage means 54 Applicable correlation information table

Claims (11)

A liquid crystal display panel having signal lines and scanning lines arranged in a matrix, and a liquid crystal display element using an OCB mode liquid crystal provided at an intersection of the signal lines and the scanning lines;
A backlight unit that is disposed on the back surface of the liquid crystal display panel and illuminates the liquid crystal display panel;
A first temperature sensor disposed at a predetermined position to detect the temperature of the liquid crystal display panel;
A second temperature sensor for detecting the outside air temperature;
A source driver for supplying a voltage to the signal line; a gate driver for supplying a gate signal to the scanning line; a panel temperature estimating means for estimating a temperature of the liquid crystal display panel; and the panel temperature estimating means estimating the temperature A panel control circuit having a panel control means for controlling the source driver, the gate driver, and the backlight unit based on the temperature of the liquid crystal display panel;
The panel temperature estimation means has a plurality of correlation information between the temperature detected by the first temperature sensor and the temperature of the liquid crystal display panel in advance corresponding to a plurality of types of outside temperatures, Correlation information to be applied is selected from the plurality of correlation information based on outside air temperature information obtained from the second temperature sensor, and detected by the first temperature sensor using the selected correlation information A liquid crystal display device that estimates the temperature of the liquid crystal display panel from the measured temperature. A liquid crystal display panel having signal lines and scanning lines arranged in a matrix, and a liquid crystal display element using an OCB mode liquid crystal provided at an intersection of the signal lines and the scanning lines;
A backlight unit that is disposed on the back surface of the liquid crystal display panel and illuminates the liquid crystal display panel;
A first temperature sensor disposed at a predetermined position to detect the temperature of the liquid crystal display panel;
A second temperature sensor for detecting the outside air temperature;
A source driver for supplying a voltage to the signal line; a gate driver for supplying a gate signal to the scanning line; a panel temperature estimating means for estimating a temperature of the liquid crystal display panel; and the panel temperature estimating means estimating the temperature A panel control circuit having a panel control means for controlling the source driver, the gate driver, and the backlight unit based on the temperature of the liquid crystal display panel,
The panel temperature estimation means includes correlation information between the temperature detected by the first temperature sensor and the temperature of the liquid crystal display panel at a predetermined outside air temperature, and the outside air temperature obtained from the second temperature sensor. It has a rule for correcting the correlation information corresponding to the outside temperature according to information, and the correlation information is corrected based on the rule from the outside temperature information, and the corrected correlation A liquid crystal display device that estimates the temperature of the liquid crystal display panel from the temperature detected by the first temperature sensor using relationship information. The second temperature sensor is arranged at a position where the outside air temperature can be detected without being affected by other heat sources,
The liquid crystal display device according to claim 1, wherein the panel temperature estimation unit uses a temperature detected by the second temperature sensor as the outside air temperature information. An electronic device incorporating the liquid crystal display device according to claim 1 or 2,
The second temperature sensor is an electronic device attached to the outside of the housing. An electronic device comprising a set substrate on which a circuit for controlling the electronic device is mounted, wherein the liquid crystal display device according to claim 1 is incorporated.
The second temperature sensor is disposed on the set substrate,
The outside air temperature signal output from the second temperature sensor is output to the circuit of the set board,
The circuit of the set board inputs the outside air temperature signal as the outside air temperature information to the panel temperature estimating means,
The panel temperature estimation means has a correction coefficient that can estimate the outside air temperature from the inputted outside air temperature information in consideration of the temperature influence from the set substrate to the second temperature sensor, An electronic apparatus that estimates an outside air temperature from the outside air temperature information using a correction coefficient, and estimates the temperature of the liquid crystal display panel based on the estimated outside air temperature. An electronic device comprising a set substrate on which a circuit for controlling the electronic device is mounted, wherein the liquid crystal display device according to claim 1 is incorporated.
The second temperature sensor is disposed on the set substrate,
The set board has a correction coefficient that can estimate the outside air temperature by correcting the outside air temperature signal output from the second temperature sensor in consideration of the temperature influence from the set board to the second temperature sensor. The outside air temperature signal output from the second temperature sensor is corrected using the correction coefficient, and the corrected outside air temperature signal is input to the panel temperature estimating unit as the outside air temperature information. , Electronic devices. An electronic device comprising a set substrate on which a circuit for controlling the electronic device is mounted, wherein the liquid crystal display device according to claim 2 is incorporated,
The second temperature sensor is disposed on the set substrate,
The set substrate has offset amount determination means for determining an offset amount for correcting the correlation information from the temperature detected by the second temperature sensor to correlation information corresponding to the detected temperature. An electronic apparatus that inputs the determined offset amount as the outside air temperature information to the panel temperature estimating means. A liquid crystal display panel having signal lines and scanning lines arranged in a matrix, and a liquid crystal display element using an OCB mode liquid crystal provided at an intersection of the signal lines and the scanning lines;
A backlight unit that is disposed on the back surface of the liquid crystal display panel and illuminates the liquid crystal display panel;
A first temperature sensor disposed at a predetermined position for detecting the temperature of the liquid crystal display panel;
A source driver for supplying a voltage to the signal line; a gate driver for supplying a gate signal to the scanning line; and a panel temperature for estimating the temperature of the liquid crystal display panel based on the temperature detected by the first temperature sensor. A panel control circuit comprising: estimation means; and panel control means for controlling the source driver, the gate driver, and the backlight unit based on the temperature of the liquid crystal display panel estimated by the panel temperature estimation means; An electronic device incorporating a liquid crystal display device comprising:
The panel temperature estimation means includes correlation information storage means for previously storing correlation information between the temperature detected by the first temperature sensor and the temperature of the liquid crystal display panel,
The correlation information stored in advance indicates the correlation between the temperature detected by the first temperature sensor and the temperature of the liquid crystal display panel by operating in an environment of a specific outside temperature assumed. Electronic devices that have been acquired. A liquid crystal display panel having signal lines and scanning lines arranged in a matrix, and a liquid crystal display element using an OCB mode liquid crystal provided at an intersection of the signal lines and the scanning lines;
A backlight unit that is disposed on the back surface of the liquid crystal display panel and illuminates the liquid crystal display panel;
A first temperature sensor for detecting the temperature of the liquid crystal display panel;
A source driver for supplying a voltage to the signal line; a gate driver for supplying a gate signal to the scanning line; and a panel temperature for estimating the temperature of the liquid crystal display panel based on the temperature detected by the first temperature sensor. A panel control circuit comprising: estimation means; and panel control means for controlling the source driver, the gate driver, and the backlight unit based on the temperature of the liquid crystal display panel estimated by the panel temperature estimation means; A method of manufacturing an electronic device including a set substrate on which a circuit for controlling the electronic device is mounted,
An assembly step of incorporating the first temperature sensor between the panel control circuit and the set substrate;
After assembling, the correlation is performed by operating in an environment of a specific expected outside air temperature and acquiring correlation information indicating a correlation between the temperature detected by the first temperature sensor and the temperature of the liquid crystal display panel. A relationship information acquisition step;
Correlation in which the panel temperature estimation means stores in advance the correlation information for use in estimating the temperature of the liquid crystal display panel based on the temperature detected by the first temperature sensor. An electronic device manufacturing method comprising an information storage step.   3. The liquid crystal display device according to claim 1, wherein the panel temperature estimation unit estimates the temperature of the liquid crystal display panel and / or the temperature of the liquid crystal display panel estimated by the panel temperature estimation unit. , A program for causing a computer to function as the source driver, the gate driver, and the panel control means for controlling the backlight unit. A recording medium on which the program according to claim 10 is recorded, wherein the recording medium can be processed by a computer.

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