JP2010002494A - Liquid crystal display and control method of liquid crystal display - Google Patents

Liquid crystal display and control method of liquid crystal display Download PDF

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JP2010002494A
JP2010002494A JP2008159341A JP2008159341A JP2010002494A JP 2010002494 A JP2010002494 A JP 2010002494A JP 2008159341 A JP2008159341 A JP 2008159341A JP 2008159341 A JP2008159341 A JP 2008159341A JP 2010002494 A JP2010002494 A JP 2010002494A
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light source
sensor
light
liquid crystal
matrix
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Koji Tamaki
浩二 田牧
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Sony Corp
ソニー株式会社
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Abstract

A technique for obtaining brightness and saturation of a desired image by a highly adaptive control system is provided.
An LCD panel 111 having red, green, and blue color filters, and light sources 121 that emit red, green, and blue light beams to respective partial regions on the back surface thereof are provided. Each RGB sensor 122S that detects a detection signal corresponding to each light amount of red, green, and blue light beams irradiated on the back surface corresponding to each light source 121 is provided. In addition, a matrix memory is provided that stores the amount of crosstalk given to each sensor signal by the light beam from each light source 121 as a crosstalk matrix. Further, a target sensor value memory for storing a target sensor value that is a sensor signal from each light quantity detection sensor under a predetermined condition is provided. Further, a circuit unit 20 that outputs each light source control signal for controlling each light source 121 from a current sensor value that is a current sensor signal from each RGB sensor 122S, a target sensor value, and a crosstalk matrix. I prepared.
[Selection] Figure 4

Description

  The present invention relates to a liquid crystal display device and a method for controlling the liquid crystal display device.

In recent years, liquid crystal display devices using liquid crystals have been widely used in various industrial fields. Such a liquid crystal display device includes a color liquid crystal display element, a drive voltage control circuit, a display light source (light source), a light detection means, and the like (refer to Patent Document 1 for terms and functions thereof). When adjusting the brightness and saturation of an image displayed on such a liquid crystal display device, a method of detecting the amount of light from the light source for each color of light by a light detecting means (sensor) and adjusting it by a feedback loop system Is used (see Patent Document 1). In addition, a plurality of sensors are used, and each of the plurality of sensors is associated with each of the plurality of divided light sources, and each light source is controlled by each sensor.
JP-A-7-294889

  However, in the method of controlling each light source by each sensor, calculation is performed without considering the influence of the surroundings, that is, crosstalk from the surrounding light sources. For this reason, the control amount for controlling the light source is excessive or insufficient, and it takes time until the control amount converges to a constant value. As a technique for solving this problem and shortening the time until convergence, a process of adding / subtracting the correction amount with respect to the control amount can be considered. However, since the correction amount varies greatly depending on various conditions, the control system for performing the correction in this way becomes complicated, and the correction amount must be specialized for each device. It was lacking in sex.

  In view of the above-described problems, the present invention provides a technique for obtaining luminance and saturation of a desired image by a highly adaptable control system that does not depend on a difference in characteristics between apparatuses.

  The liquid crystal display device of the present invention includes a liquid crystal panel having red, green, and blue color filters, and a red color for each partial region of the back surface so as to irradiate a light beam over the entire back surface of the liquid crystal panel. Each light source that emits a green and blue light beam and each corresponding to each light source are arranged to detect a detection signal corresponding to each light amount of the red, green, and blue light beams irradiated on the back surface. Each light quantity detection sensor, a matrix memory for storing the amount of crosstalk given to each sensor signal by the light beam from each light source as a crosstalk matrix, and a sensor signal from each light quantity detection sensor under a predetermined condition A target sensor value memory for storing the target sensor value, a current sensor value which is a current sensor signal from each light quantity detection sensor, and Comprising a serial target sensor value, based on said crosstalk matrix, and a circuit unit for outputting a light source control signal for controlling the respective light source.

  In the liquid crystal display device control method of the present invention, the liquid crystal panel has red, green, and blue color filters, and each light source arranged to irradiate a light beam over the entire back surface of the liquid crystal panel includes: Red, green, and blue light beams are emitted to the respective partial areas on the back surface, and the respective light quantity detection sensors respectively disposed corresponding to the light sources are irradiated on the back surface with red, green, and blue colors. The sensor signal corresponding to each light amount of the light beam is detected, the matrix memory stores the amount of crosstalk that the light beam from each light source gives to each sensor signal as a crosstalk matrix, and the target sensor value memory Storing a target sensor value that is a sensor signal from each of the light quantity detection sensors under a predetermined condition, and the circuit unit detects a current sensor value from each of the light quantity detection sensors. The current sensor value is over signal, and the target sensor value, based on said crosstalk matrix, and outputs a light source control signal for controlling the light sources.

  In the technology relating to the liquid crystal display device of the present invention, the amount of crosstalk given to each sensor signal by the light beam from each light source is stored as a crosstalk matrix. Then, a light source control signal for controlling each light source is output based on a current sensor value, a target sensor value, and a crosstalk matrix that are current sensor signals from the respective light quantity detection sensors. In this way, white balance and uniformity can be ensured.

  According to the technology of the present invention, the brightness and saturation of an image displayed on a liquid crystal display device can be made desired at high speed.

  In the technology of the liquid crystal display device of the embodiment, the liquid crystal display device includes a liquid crystal panel, each light source, each light amount detection sensor, and a circuit unit. The circuit unit has a matrix memory and a target sensor value memory. The liquid crystal panel has red, green, and blue color filters. Each light source (for example, LED) arranged to irradiate a light beam over the entire back surface of the liquid crystal panel emits red, green, and blue light beams to each partial region on the back surface. Each light quantity detection sensor (RGB sensor) specified corresponding to each light source detects a sensor signal corresponding to each light quantity of the red, green, and blue light beams irradiated on the back surface. The matrix memory stores the amount of crosstalk given to each sensor signal by the light beam from each light source as a crosstalk matrix. The target sensor value memory stores a target sensor value that is a sensor signal from each light quantity detection sensor under a predetermined condition. The circuit unit outputs a light source control signal for controlling each light source based on a current sensor value, a target sensor value, and a crosstalk matrix that are current sensor signals from the respective light quantity detection sensors.

(Liquid Crystal Display Device of Embodiment)
Hereinafter, the technology of the embodiment will be described with reference to the drawings. FIG. 1 is a diagram schematically showing an optical unit 10 which is a main part of the liquid crystal display device of the embodiment. The optical unit 10 includes a liquid crystal panel assembly (LCD (Liquid Crystal Display) panel assembly) 11 and a backlight assembly (backlight assembly) 12. The LCD panel Assy 11 moves in the direction indicated by the arrow, and the LCD panel Assy 11 and the backlight Assy 12 are combined to constitute the optical unit 10.

  FIG. 2 is a diagram schematically showing a cross-sectional view of the optical unit 10 shown in FIG. As shown in FIG. 2A, the LCD panel Assy 11 includes a liquid crystal panel (LCD panel) 111 and an optical sheet 112. The LCD panel (liquid crystal panel) 111 is formed with color filters of each color of red (R (Red)), green (G (Green)), and blue (B (Blue)). The amount of light of each color that passes through the color filter of each color is adjusted by a circuit unit described later, and a desired image is displayed on the image viewing surface of the LCD panel 111. The optical sheet 112 has a brightness enhancement film (DBEF), a diffusion sheet, and a diffusion plate. Such a configuration of the optical sheet 112 is normally used in a liquid crystal display device. Further, as shown in FIG. 2A, the backlight assembly 12 is formed by having an LD unit (LED (Light Emitting Diode) unit) 121 and a detection sensor unit 122. On the surface of the LED unit 121 that faces the optical sheet 112, a plurality of LED (LED) is disposed as a light source that emits light beams of red, green, and blue colors. The detection sensor unit 122 is provided with an RGB sensor 122S that functions as a light amount detection sensor.

  FIG. 2B is a diagram schematically showing an enlarged part of the optical unit 10 shown in FIG. As shown in FIG. 2B, the LCD panel 111 has three kinds of color filters of red (R), green (G), and blue (B) having a very small area arranged regularly and uniformly. On the surface of the surface of the LED unit 121 facing the optical sheet 112, LEDs emitting three kinds of colors of red (R), green (G), and blue (B) are regularly and uniformly arranged. An RGB sensor (RGB sensor) 122S is arranged in the detection sensor unit 122. The RGB sensor 122 </ b> S detects the amount of light (light quantity) irradiated from the hole provided in the LED unit 121 to the back surface (surface opposite to the image viewing surface) of the LCD panel 111. The RGB sensor 122S can detect three types of colors of red (R), green (G), and blue (B) separately.

  Three types of LEDs, red (R), green (G), and blue (B), which are light sources, are controlled simultaneously for each group. These groups are represented by a light source 1211, a light source 1212, a light source 1213, a light source 1214, a light source 1215, a light source 1216, a light source 1217, a light source 1218, a light source 1219, a light source 12110, a light source 12111, and a light source 12112 (see FIG. 4).

  FIG. 3 is a diagram showing how the RGB sensor 122S is arranged. FIG. 3 is a perspective view of the detection sensor unit 122 as viewed from the back surface side of the backlight assembly 12 (the surface opposite to the surface with respect to the LCD panel assembly 11). In this case, the backlight assembly 12 includes twelve RGB sensors 122S. Each of the RGB sensors 122S is given the following symbols in order. The first column is an RGB sensor 122S1, an RGB sensor 122S2, and an RGB sensor 122S3. The second column is an RGB sensor 122S4, an RGB sensor 122S5, and an RGB sensor 122S6. The third column is an RGB sensor 122S7, an RGB sensor 122S8, and an RGB sensor 122S9. The fourth column is an RGB sensor 122S10, an RGB sensor 122S11, and an RGB sensor 122S12.

  A broken-line partial area B1 is a range of the LED (light source 1211) controlled by the RGB sensor 122S1. A broken-line partial region B2 is a range of the LED (light source 1212) controlled by the RGB sensor 122S2. A broken-line partial region B3 is a range of the LED (light source 1213) controlled by the RGB sensor 122S3. A broken-line partial area B4 is a range of the LED (light source 1214) controlled by the RGB sensor 122S4. A broken-line partial region B5 is a range of the LED (light source 1215) controlled by the RGB sensor 122S5. A broken-line partial region B6 is a range of the LED (light source 1216) controlled by the RGB sensor 122S6. A broken-line partial region B7 is a range of the LED (light source 1217) controlled by the RGB sensor 122S7. A broken-line partial region B8 is a range of the LED (light source 1218) controlled by the RGB sensor 122S8. A broken-line partial region B9 is a range of the LED (light source 1219) controlled by the RGB sensor 122S9. A broken-line partial region B10 is a range of the LED (light source 12110) controlled by the RGB sensor 122S10. A broken-line partial region B11 is a range of the LED (light source 12111) controlled by the RGB sensor 122S11. A broken-line partial region B12 is a range of the LED (light source 12112) controlled by the RGB sensor 122S12.

  FIG. 4 is a diagram illustrating a relationship between the circuit unit 20 and the optical member. The circuit unit 20 includes a nonvolatile memory 21, a central processing unit (CPU) 22, an LED driver 23, and an LCD driver 24. The LCD driver 24 controls the color filter of the LCD panel 111 according to the input signal. The LCD driver 24 and the CPU 22 exchange information with each other. The nonvolatile memory 21, the CPU 22, and the LED driver 23 function as a light source control circuit that controls the light sources 1211 to 12112.

  The CPU 22 receives detection signals from the RGB sensors 122S1 to RGBS 122S12. Since three signals corresponding to red, green, and blue (R, G, B) are input from each RGB sensor, 36 sensor signals are input to the CPU 22. The CPU 22 uses these 36 sensor signals, 36 control target values (target sensor values Tsn described later) stored in the non-volatile memory, and three 12 × 12 crosstalk matrices M described later. Based on the above, a predetermined calculation is performed. Then, LED control signals (light source control signals) for controlling each of the 36 light sources are obtained. These LED control signals are input to the LED driver 24, and the 36 LED drive signals are supplied from the light sources 1211 to 12112. To be supplied. Since each of the light sources 1211 to 12112 is formed from three types of LED groups of red, green, and blue, for example, for the light source 1211, red, green, and blue (R, G, B) LEDs are Driven by three LED drive signals. Similarly, each of the other light sources 1212 to 12112 is driven by three LED drive signals.

  FIG. 4 describes the relationship between the light source and the RGB sensor. That is, in the ideal state, only light from the light source 1211 is described as being input to the RGB sensor 122S1. In addition, for example, only light from the light source 1212 is described as being input to the RGB sensor 122S2. However, in practice, light from adjacent light sources is actually detected from an RGB sensor that is not intended to be detected. For example, the RGB sensor 122S2 detects not only light from the light source 1212 but also light from the light source 1211, the light source 1213, the light source 1215, and the like (see FIG. 3). For example, the RGB sensor 122S5 detects not only light from the light source 1215 but also light from the light source 1212, the light source 1214, the light source 1216, the light source 1218, and the like (see FIG. 3).

  When only the light from the light source 121n leaks into the RGB sensor 122Sn (n = 1 to 12), the control system is a control system with one input and one output, so the configuration is very simple. . However, in the case where there is crosstalk, sufficient performance cannot be obtained when configured as such a simple control system. Hereinafter, how to control the optical system having such crosstalk will be described.

(Light Source Control Method of Embodiment)
The control method of the embodiment will be described with reference to a flowchart of processing performed by the CPU 22 shown in FIG.
In step ST <b> 10, a target sensor value Tsn that is a target sensor signal value from the RGB sensor is read from the nonvolatile memory 21. Here, the target sensor value Tsn is a value obtained by saving a value at the time of completion of adjustment at the time of manufacturing the liquid crystal display device.

  In step ST11, 36 current sensor values Psn, which are the values of the current sensor signal, are read from each of the RGB sensors 122S1 to 122S12.

  In step ST12, the value of the LED control signal (light source control signal) is calculated from the target sensor value Tsn and the current sensor value Psn. The contents of the calculation in step ST12 will be described in detail later.

  In step ST13, 36 LED control signal values are output to the LED driver 23.

  When the process of step ST13 is completed, the process returns to step ST11.

  The above calculation is performed by an interrupt process, and the processes of steps ST11 to ST13 are performed by one interrupt. The trigger for the interrupt may be a timer interrupt that always interrupts every predetermined time, or may be interrupted when the image brightness setting button for adjusting the brightness of the image is operated. .

  The contents of the process performed in step ST12 will be described in detail below.

  First, the matrix M expressed by Equation 1 will be described. The matrix M is generated by the circuit unit 20 based on the current sensor value Psn obtained from each RGB sensor in step ST11, for example.

The matrix M is obtained for each of red (red), green (green), and blue (blue). In the following, red will be described as a representative. Each element of the matrix M has the following meaning. The meaning of only a part of each element is described, but the other elements have the same meaning. The matrix M is referred to as a crosstalk matrix.

(1, 1) A value detected from a sensor for detecting red color of the RGB sensor 122S1 when the red LED of the light source 1211 is turned on.
(2, 1) A value detected from a sensor for detecting red color of the RGB sensor 122S2 when the red LED of the light source 1211 is turned on.
(3, 1) A value detected from a sensor for detecting the red color of the RGB sensor 122S3 when the red LED of the light source 1211 is turned on.

(1,2) A value detected from a sensor for detecting red color of the RGB sensor 122S1 when the red LED of the light source 1212 is turned on.
(2, 2) A value detected from a sensor for detecting the red color of the RGB sensor 122S2 when the red LED of the light source 1212 is turned on.
(3, 2) A value detected from a sensor for detecting red color of the RGB sensor 122S3 when the red LED of the light source 1212 is turned on.

(12, 12) A value detected from a sensor for detecting red color of the RGB sensor 122S12 when the red LED of the light source 12112 is turned on.

  That is, when obtaining the values of the elements (m, n) of the matrix M, the following operation is performed. n is fixed, only the light source 121n is turned on, and the other light sources are turned off. Then, m is changed in order from m = 1 to 12, and the CPU 22 detects the sensor signals from the RGB sensor 122Sm in order. Next, the value of n is changed and fixed to another value. Similarly, as described above, the CPU 22 sequentially detects sensor signals from the RGB sensor 122Sm by sequentially changing m = 1 to 12. Like to do.

  In the matrix M shown in Table 1, the diagonal elements are not 1. In order to simplify the subsequent calculation, the matrix M shown in Equation 2 is normalized so that the diagonal element is 1. That is, the matrix M expressed by Equation 2 is normalized so that the component whose lighting position matches the sensor position is 1. The normalized matrix is referred to as a normalized matrix M. The normalization matrix M is also a kind of crosstalk matrix.

  The matrix M has the following characteristics if the temperature characteristics and the secular change of the optical member related to the crosstalk are small, and the ratio of the change in the amount of crosstalk to the amount of light from each light source is constant. That is, the value of each element of the matrix does not change regardless of the amount of light from each light source, the environmental temperature at which the liquid crystal display device is operated, and the time. A general liquid crystal display device satisfies such a condition.

  Since the matrix M has such properties, when the matrix M is used, the matrix M may be obtained at any stage. That is, as described above, instead of obtaining the matrix M in step ST11, for example, it may be obtained immediately after completion of adjustment at the time of manufacture. Further, in a special state where the state of the image on the liquid crystal panel is constant, the values of the elements of the standardized matrix M to be obtained are equal. For example, the matrix M obtained in a state where a uniform white balance is obtained (having uniformity) in the entire image of the liquid crystal panel is equal regardless of the luminance.

  Therefore, when the apparatus is operated with the white balance properly maintained, once the matrix M is obtained, it is not necessary to perform the calculation again, and the matrix M is stored in the memory that stores the matrix M. This can be used. Alternatively, the matrix M may be calculated outside the liquid crystal display device and stored in the nonvolatile memory 21 of the circuit unit 20 of the liquid crystal display device without being calculated by the circuit unit of the liquid crystal display device. Similarly, the inverse matrix iM may be stored in the nonvolatile memory 21 of the circuit unit 20.

  The value of each sensor when all the light sources are turned on is Dsn (Ds1, Ds2, Ds3 ... Ds12). Dsn is referred to as a sensor value when all light sources are turned on. For example, Ds1 is a value detected from a sensor that detects red color of the RGB sensor 122S1. The other values are also values detected from other RGB sensors that detect red.

  Also, the measured value of the sensor in the same block when a certain light source is illuminated is assumed to be Dtn (Dt1, Dt2, Dt3,... Dt12). Dtn is referred to as a sensor value when the self-light source is turned on. For example, Dt1 is a value detected from the sensor that detects red color of the RGB sensor 122S1 when the red LED of the light source 1211 is illuminated. Then, the relationship shown in Formula 3 is established.

  Here, when the inverse matrix of the normalization matrix M is a matrix iM, Formula 4 is established.

  Next, in Equation 4, the sensor value Dsn (Ds1, Ds2, Ds3... Ds12) when all the light sources are turned on is replaced with the target sensor value Tsn held in the nonvolatile memory 21. Here, the target sensor value Tsn (Ts1, Ts2, Ts3 ... Ts12) is the value of the sensor signal from each RGB sensor when all the light sources are turned on at the time of manufacture at the factory. is there. For example, Ts1 is a value detected from a sensor that detects red color of the RGB sensor 122S1 when all the LEDs of the light sources 1211 to 12112 are illuminated at the time of manufacture. Dtn (Dt1, Dt2, Dt3... Dt12) obtained at this time is set as TTsn (TTs1, TTs2, TTs3... TTs12), and TTsn is stored. TTsn is referred to as a target self-light source sensor value. TTsn is stored in a memory arranged in the circuit unit 20.

  Here, how to turn on all the light sources in obtaining the target sensor value Tsn at the time of manufacture in a factory will be described. At the time of manufacturing the liquid crystal display device, white balance is adjusted to ensure uniformity over the entire surface of the image, and brightness is adjusted appropriately. The value of the sensor signal from each RGB sensor obtained in this way is the target sensor value Tsn.

  Further, in Formula 4, the current sensor values Psn (Ps1, Ps2, Ps3,..., Ps12), which are the sensor signal values obtained in step ST11, are the sensor values Dsn (Ds1, Ds2, Ds3,. ). For example, Ps1 is a value detected from each sensor that detects red color of the RGB sensor when red LEDs of all the light sources are emitted, obtained in step ST11. Dtn (Dt1, Dt2, Dt3... Dt12) obtained at this time is set as TPsn (TPs1, TPs2, TPs3... TPs12), and TPsn is stored. TPsn is currently referred to as a sensor value when the self-light source is turned on. TPsn is stored in a memory arranged in the circuit unit 20.

  Consider that the current sensor value Psn (Ps1, Ps2, Ps3,..., Ps12) obtained in step ST11 matches the target sensor value Tsn (Ts1, Ts2, Ts3,... Ts12), which is a target value. For this purpose, FBn given by Equation 5 which is a coefficient for correcting the LED control signal output from the CPU 22 is introduced. FBn is referred to as a correction coefficient.

  Equation 5 shows how to control the nth light source 121n. As described above, since FBn in this case has been described in the example for controlling the red LEDs of the light sources 1211 to 12112, the correction coefficient FBn is a correction coefficient for red. For example, FB1 is a correction coefficient for the LED drive signal that causes the red LED of the light source 1211 to shine. Correction coefficients can be obtained in the same manner for other colors such as green and blue.

  Here, the meaning of the correction coefficient FBn in Expression 5 is as follows. When the LED (each light source) drive method is an analog method, assuming that the current value of the current flowing through the LED is AN1n, the desired value of AN2n is obtained by AN2n = FBn × AN1n . Further, when the LED driving method is the PWM method, the pulse width modulation signal is used as the light source control signal and the light source driving signal, and thus control is performed as follows. Assuming that the current pulse width for driving the LEDs (each light source) is PWM1n, the value of PWM2n, which is a desirable pulse width, is obtained by PWM2n = FBn × PWM1n. In other words, if the crosstalk matrix is obtained when each light source is driven with the current value AN2n or the pulse width PWM2n, it should be approximated to Formula 2 in which white balance and uniformity are ensured.

  In the above description, only red is described, but the same control can be performed for green and blue.

(Specific example of light source control method of embodiment)
Formula 6 shows a specific example of the normalization matrix M.

Formula 7 shows a specific example of the matrix iM that is an inverse matrix of the normalization matrix.

Formula 8 shows a specific example of the sensor value Dsn when a current light source is turned on for a certain color (for example, red).

Formula 9 shows a specific example of obtaining the sensor value TPsn when the current self-light source is lit from the current sensor value Dsn when all the light sources are lit.

Formula 10 shows a specific example of the target sensor value Tsn.

Formula 11 shows a specific example of obtaining the sensor value TTsn when the target self-light source is turned on from the target sensor value Tsn.

Formula 12 shows a specific example in which FBn is obtained from the sensor value TPsn when the current self-light source is turned on and the sensor value TTsn when the target self-light source is turned on. Such FBn is also obtained for green and blue, and a total of 36 correction coefficients are obtained.

  In a specific example, the current (before configuration) 36 PWM control signals (light source control signals) are multiplied by a correction coefficient corresponding to each and supplied to the LED driver 23. The pulse width of the PWM drive signal (light source drive signal) from the LED driver 23 is corrected in this way and supplied to each of the light sources 1211 to 12112. For example, even when the luminance is changed, an image with good white balance and good uniformity is displayed by the correction coefficient described above.

  According to the technology of the embodiment, since the control is performed in consideration of the influence from the adjacent light source controlled by the control system of another system, it is highly adaptable and converges to a desired target value at high speed. A control system with extremely high accuracy can be realized. That is, in the conventional method shown as the background art, the feedback amount is calculated without considering the influence of the surroundings, and the feedback is performed by multiplying the fitting coefficient so as not to diverge. Compared to such a conventional technique, the technique of the embodiment has great advantages in all of adaptability, high speed, and accuracy.

  In the embodiment, a crosstalk matrix is obtained in a state where white balance and uniformity of the entire screen are secured, and the crosstalk matrix is normalized and used thereafter. Therefore, the brightness of the screen can be adjusted without impairing the white balance and the uniformity of the entire screen.

It is a figure which shows typically the optical part of the liquid crystal display device of embodiment. It is a figure which shows typically sectional drawing of the optical part shown in FIG. It is a figure which shows how the RGB sensor and the temperature sensor are arrange | positioned. It is a figure which shows the relationship between a circuit part and an optical member. It is a figure for demonstrating the process performed in a circuit part.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 Optical part, 20 Circuit part, 21 Non-volatile memory, 23 LED driver, 24 LCD driver, 111 LCD panel (liquid crystal panel), 1211-1212 Light source, 122S1-122S12 RGB sensor (light quantity detection sensor), B1-B12 partial area ,

Claims (5)

  1. A liquid crystal panel having red, green and blue color filters;
    In order to irradiate a light beam over the entire back surface of the liquid crystal panel, each light source that emits a red, green, blue light beam to each partial region of the back surface;
    Each light quantity detection sensor that is arranged corresponding to each light source and detects a detection signal corresponding to each light quantity of the red, green, and blue light beams irradiated on the back surface;
    A matrix memory for storing, as a crosstalk matrix, the amount of crosstalk given to each sensor signal by the light beam from each light source;
    A target sensor value memory for storing a target sensor value which is a sensor signal from each of the light quantity detection sensors under a predetermined condition;
    A circuit unit that outputs each light source control signal for controlling each light source based on a current sensor value that is a current sensor signal from each light amount detection sensor, the target sensor value, and the crosstalk matrix; A liquid crystal display device comprising:
  2. The circuit section is
    The liquid crystal display device according to claim 1, further comprising an inverse matrix memory that normalizes the crosstalk matrix to obtain an inverse matrix and stores the inverse matrix.
  3. The matrix memory is
    The liquid crystal display device according to claim 1, wherein the crosstalk matrix is stored in a state where uniform white balance is obtained over the entire surface of the image displayed over the entire surface of the liquid crystal panel.
  4. Each light source control signal is:
    A pulse width modulated signal,
    The circuit section is
    2. The liquid crystal display device according to claim 1, wherein a desired control signal is obtained by multiplying the current light source control signal by a correction coefficient obtained from the current sensor value, the target sensor value, and the crosstalk matrix.
  5. The liquid crystal panel has red, green and blue color filters,
    Each light source arranged to irradiate a light beam over the entire back surface of the liquid crystal panel emits red, green, and blue light beams to each partial region of the back surface,
    Each light amount detection sensor arranged corresponding to each light source detects a sensor signal corresponding to each light amount of the red, green, and blue light beams irradiated on the back surface,
    A matrix memory stores the amount of crosstalk given to each sensor signal by the light beam from each light source as a crosstalk matrix,
    The target sensor value memory stores a target sensor value that is a sensor signal from each light quantity detection sensor under a predetermined condition,
    The circuit unit outputs a light source control signal for controlling each light source based on a current sensor value that is a current sensor signal from each light quantity detection sensor, the target sensor value, and the crosstalk matrix. Control method of liquid crystal display device.
JP2008159341A 2008-06-18 2008-06-18 Liquid crystal display and control method of liquid crystal display Pending JP2010002494A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9307607B2 (en) 2012-10-01 2016-04-05 Canon Kabushiki Kaisha Light source apparatus and control method thereof

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9307607B2 (en) 2012-10-01 2016-04-05 Canon Kabushiki Kaisha Light source apparatus and control method thereof

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